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Paolo POZZI

Ricercatore Universitario
Dipartimento di Ingegneria "Enzo Ferrari"

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Pubblicazioni

- Procedimento ed impianto per realizzare materiali compositi [Brevetto]
Barbieri, Luisa; Pozzi, Paolo; Lancellotti, Isabella; V., Colombo; E., Ghedini; D., Russo; G., Masini
abstract

La presente invenzione è relativa ad un procedimento e ad un impianto per realizzare materiali compositi, ed in particolare ad un procedimento e ad un impianto per caricare, in particolare rinforzare, una base polimerica con materiale di apporto per definire il materiale composito.

2023 - Low environmental impact remediation of microplastics: Visible-light photocatalytic degradation of PET microplastics using bio-inspired C,N-TiO2/SiO2 photocatalysts [Articolo su rivista]
Ariza-Tarazona, Maria Camila; Siligardi, Cristina; Carreón-López, Hugo Alejandro; Valdéz-Cerda, José Enrique; Pozzi, Paolo; Kaushik, Garima; Villarreal-Chiu, Juan Francisco; Cedillo-Gonzalez, Erika Iveth
abstract

: Microplastics (MPs) are plastic particles with sizes between 1 μm and 5 mm with a ubiquitous presence in aquatic ecosystems. MPs harm marine life and can cause severe health problems for humans. Advanced oxidation processes (AOPs) that involve the in-situ generation of highly oxidant hydroxyl radicals can be an alternative to fight MPs pollution. Of all the AOPs, photocatalysis has been proven a clean technology to overcome microplastic pollution. This work proposes novel C,N-TiO2/SiO2 photocatalysts with proper visible-active properties to degrade polyethylene terephthalate (PET) MPs. Photocatalysis was performed in an aqueous medium and at room temperature, evaluating the influence of two pH values (pH 6 and 8). The results demonstrated that the degradation of the PET MPs by C,N-TiO2/SiO2 semiconductors is possible, achieving mass losses between 9.35 and 16.22 %.

2023 - Three sustainable polypropylene surface treatments for the compatibility optimization of PP fibers and cement matrix in fiber-reinforced concrete [Articolo su rivista]
Malchiodi, B.; Pelaccia, R.; Pozzi, P.; Siligardi, C.
abstract

2022 - A Practical Valorization Approach for Mitigating Textile Fibrous Microplastics in the Environment: Collection of Textile-Processing Waste Microfibers and Direct Reuse in Green Thermal-Insulating and Mechanical-Performing Composite Construction Materials [Articolo su rivista]
Malchiodi, Beatrice; Siligardi, Cristina; Pozzi, Paolo; Iveth Cedillo-González, Erika
abstract

2022 - Char Valorization into Sustainable and Performant Polyurethane Insulating Panels [Articolo su rivista]
Malchiodi, Beatrice; Barbieri, Luisa; Lancellotti, Isabella; Pozzi, Paolo
abstract

2022 - Green fiber reinforced cements containing recycled textile fibers from the finishing of fabrics [Poster]
Malchiodi, Beatrice; Pozzi, Paolo; Siligardi, Cristina
abstract

2022 - Optimization of Polyurethane Panels Properties through Different Particle and Fiber Reinforcement [Articolo su rivista]
Malchiodi, Beatrice; Pozzi, Paolo
abstract

2022 - Recovery of Cork Manufacturing Waste within Mortar and Polyurethane: Feasibility of Use and Physical, Mechanical, Thermal Insulating Properties of the Final Green Composite Construction Materials [Articolo su rivista]
Malchiodi, Beatrice; Marchetti, Roberta; Barbieri, Luisa; Pozzi, Paolo
abstract

The valorization of industrial waste is a hot topic toward circular economy and sustainability. Several wastes have been proposed as resources for different production processes; however, others are still disposed to landfill or waste-to-energy plants. For the first time, this work suggests a sustainable alternative to managing cork waste from bottle caps manufacturing; this is generated by a local company at about 220,000 m3/year. The powder waste has a 0.063–1 mm particle size and is mainly composed of cork, polyurethane adhesive, and paraffin. Its valorization is proposed as filler in construction materials such as lime-based mortar (1–4 wt%) and polyurethane (5–15 wt%). Thermal, spectroscopic, and physical characterizations are performed on the cork waste, and mainly result in a low apparent density (340 kg/m3) and high-water absorption (177%). Cork properties allow consideration of extra water in the mortar mix and improve lightness without significantly affecting compressive, bending strength, and thermal insulation. Cork waste in polyurethanes promotes a color change, slightly increases the density (up to 12.5%), and still results in producing a thermally insulating material (<0.06 W/mK). Considering the promising results, this study demonstrates the feasibility of using the manufacturing waste from cork bottle caps to produce green construction materials, thus upgrading it from waste to secondary raw material.

2022 - Unsaturated Polyester-Based Polymer Concrete Containing Recycled Cathode Ray Tube Glass Aggregate [Articolo su rivista]
Malchiodi, Beatrice; Siligardi, Cristina; Pozzi, Paolo
abstract

Polymer concrete (PC) is a composite construction material that boasts several advantages, such as lightness, low water permeability, high resistance to corrosive environments, and chemical degradation. Consequently, it has recently attracted interest as an alternative material to the traditional ones for several civil applications. In this study, unsaturated polyester resin was considered the matrix phase of PC. Aimed to produce green PC, the commonly dispersed phase of natural aggregate was totally replaced by recycled glass aggregate (RGA) deriving from cathode ray tube (CRT) glass waste. Fine and coarse fractions of non-hazardous CRT glass were considered in different ratios. Chemical and physical analyses were carried out through XRF, particle size distribution and microstructural analysis to characterize RGA. The influence of RGA particle size and percentage on PC performance was investigated by microstructural analysis and aggregate packing, chemical resistance, water absorption, and mechanical analyses, such as bending, impact, and scratch test. Using solely the coarse fraction of RGA led to the manufacturing of a green PC with similar performance to the traditional PC and in addition lower in density. The PC quality mainly depended on the matrix crosslinking which, for PC containing fine RGA, was promoted by adding 4 wt% of silane coupling agent.

2021 - Eco-compatible construction materials containing ceramic sludge and packaging glass cullet [Articolo su rivista]
Andreola, F.; Lancellotti, I.; Pozzi, P.; Barbieri, L.
abstract

This research reports results of eco-compatible building material obtained without natural raw materials. A mixture of sludge from a ceramic wastewater treatment plant and glass cullet from the urban collection was used to obtain high sintered products suitable to be used as covering floor/wall tiles in buildings. The fired samples were tested by water absorption, linear shrinkage, apparent density, and mechanical and chemical properties. Satisfactory results were achieved from densification properties and SEM/XRD analyses showed a compact polycrystalline microstructure with albite and wollastonite embedded in the glassy phase, similar to other commercial glass-ceramics. Besides, the products were obtained with a reduction of 200◦ C with respect to the firing temperatures of commercial ones. Additionally, the realized materials were undergone to leaching test following Italian regulation to evaluate the mobility of hazardous ions present into the sludge. The data obtained verified that after thermal treatment the heavy metals were immobilized into the ceramic matrix without further environmental impact for the product use. The results of the research confirm that this valorization of matter using only residues produces glass ceramics high sintered suitable to be used as tile with technological properties similar or higher than commercial ones.

2021 - Materiali compositi sostenibili e a bassa trasmittanza termica: cementi contenenti microfibre tessili di riciclo Sustainable and thermal nsulating composite materials:cements containing recycled textile m,icrofibres [Articolo su rivista]
Malchiodi, Beatrice; Siligardi, Cristina; Pozzi, Paolo
abstract

L’impiego di materie prime di riciclo si impone come urgente ed attuale obiettivo per lo sviluppo di materiali da costruzione sostenibili. Tra i rifiuti non pericolosi generati dall’industria manifatturiera italiana, il 37.4% è derivante dal settore tessile e tra di essi si individuano sia rifiuti vestiari che fibre di scarto del processo produttivo. Si stima che la seconda tipologia venga prodotta in Italia nella misura di 5000ton/anno. In questo lavoro, si è valutato il riciclo di microfibre tessili derivanti da operazioni di finissaggio all’interno di impasti cementizi. L’inserimento in miscela del 4% di microfibre (60%cotone, 30%misto cotone, 10%sintetico) ha prodotto, rispetto al semplice cemento, un incremento del 400% della resistenza a flessione, una riduzione del 80% del ritiro ed il raddoppio del potere isolante termico. Si è, quindi, validato l’impiego di microfibre tessili di scarto per la produzione di compositi cementizi sostenibili ed a ridotta trasmittanza termica.

2021 - Use of recycled textile fibres for sustainable and thermal insulating Fibre Reinforced Cement [Abstract in Atti di Convegno]
Malchiodi, Beatrice; Siligardi, Cristina; Pozzi, Paolo
abstract

Recycling and sustainability are hot topics for Civil applications. Since 37.4% of Italian non-hazardous waste comes from the textile field, many studies focused on their reuse. This work investigates the recovery of waste textile microfibres, deriving from finishing of fabrics, into sustainable and low conductive Fibre-Reinforced Cement (FRC). The microfibres are characterized through FTIR technique and Scanning Electron Microscopy; moreover, water content and water absorption are evaluated for mix design. Unsaturated, saturated and NaOH treated microfibres are considered. Following a preliminary workability evaluation, they are introduced in Portland cement in 1%, 2%, 3%, 4% by weight. At increasing fibre percentage, the three-point bending test displays an enhance from 1.5 to 4 times the maximum bending load of non-reinforced Portland and a marked increase in toughness is observed. The linear shrinkage is reduced from 20% to 80%, and NaOH microfibres result in more efficiency. Stereomicroscopy confirmed a high fibre dispersion into the cement matrix. A reduction in thermal conductivity is observed when increasing percentage of the untreated fibres, and for 4% fibre percentage the Portland insulation power is doubled. The feasibility of using recycled textile microfibre into FRC is demonstrated and results in improving sustainability, mechanical properties and power insulating.

2021 - Valorization of demolition concrete waste and tile waste into more sustainable structural concretes and grouts [Poster]
Malchiodi, Beatrice; Siligardi, Cristina; Pozzi, Paolo
abstract

2020 - Char valorization in construction materials [Capitolo/Saggio]
Andreola, Nora Maria; Barbieri, Luisa; Lancellotti, Isabella; Pozzi, Paolo; Vezzali, Vittorio
abstract

2019 - Differences among Three Branded Formulations of Hyaluronic Acid: Data from Environmental Scanning Electron Microscope Profile, Rheology Behavior and Biological Activity [Articolo su rivista]
Mantovani, Veronica; Galeotti, Fabio; Volpi, Nicola; Pozzi, Paolo; Baraldi, Enrica.
abstract

Background: This study has analysed the viscosupplemental proprieties of three commercially available formulations of Hyaluronic Acid (HA) suspension (F1: Synvisc, Hylan G-F 20; F2: Hyalgan; F3: Donegal HA 2.0), which differ in composition, Molecular Weight (MW) and HA content. Methods: Analyses were conducted using rheology measurements and Environmental Scanning Electron Microscope (ESEM). The capacity of the three tested formulations to inhibit specific Metalloproteases (MMPs) was also evaluated. Results: F1 is the only sample showing viscoelastic properties but may have increased immunogenicity attributable to the subsequent chemical cross-linking process that enhances the MW. F2 and F3 show a lower viscosity compared to F1. F2 has the lowest viscosity at low shear rate, the lower independence from the oscillatory stress and a solution-like rheology behaviour. F3 display a solution behaviour. However, unlike F2, F3 crossover point falls in the middle of the frequency range of interest showing a considerable rheological behaviour. The internal structure of F3 (pseudo-spongy thick filaments) suggests that it has the ability to interact with a great water content. The crossover points of the examined samples clearly reveal their different rheological behaviour, allowing their classification in gel-like or solution-like materials. F3 has higher ability in inhibiting MMP- 2 and MMP-9 activity compared to F1 and F2, probably due to its specific MW and/or higher HA concentration. Conclusion: The three tested HA formulations differ in rheological properties and inhibition of MMP-2 and MMP-9 activity. F3 seems to be the most appropriate formulation for the treatment of osteoarthritis and rheumatoid arthritis.

2019 - Recycling of Kevlar fabrics in the production of protections for sports use [Relazione in Atti di Convegno]
Pozzi, Paolo
abstract

In this work the possible recycling of Kevlar fabrics in the production of reinforcements for sportswear was evaluated. The Kevlar fabrics used are obtained from the recycling of bullet-proof vests discarded by the Italian state police. The work analyzes the state of conservation of Kevlar, the techniques for recovering the fabric from bulletproof vests and illustrates the design of the garments and the analysis techniques used for the validation of the garments produced.

2019 - RECYCLING OF TEXTILE FIBERS FOR THE PRODUCTION OF FIBRE-REINFORCED CEMENT [Articolo su rivista]
Pozzi, Paolo
abstract

This research analyzes the possible recovery of waste textile fibers as reinforcements for components made of cement.

2019 - Studio del recupero di materiali da demolizione nella produzione di calcestruzzi e malte [Relazione in Atti di Convegno]
Pozzi, Paolo; Di Maro, Pasquale; Montalti, Francesca; Neri, Esmeralda
abstract

Con questo lavoro si vuole testare la possibilità di utilizzare aggregati riciclati, provenienti da demolizioni edili, per il confezionamento di calcestruzzi e betoncini, andando a creare miscele di frazioni di aggregati riciclati, che vanno in sostituzione delle frazioni naturali generalmente impiegate nella produzione di calcestruzzi e betoncini. L’obiettivo principale è la valutazione della resistenza caratteristica di campioni cubici realizzati con aggregati da recupero in sostituzione a frazioni naturali

2019 - Study of the recyclability of thermoplastic polyurethane [Relazione in Atti di Convegno]
Pozzi, Paolo
abstract

The thermoplastic polyurethane (TPU) is a polymer of particular interest whose use tends to grow over time as it has particular mechanical and physical properties. These properties make it the most used material when it is necessary to combine high mechanical strength and elasticity. On the other hand, TPUs are among those classes of polymers where recycling is less developed, therefore we have analyzed the thermal-mechanical recycling behavior of this material to verify the limits and possibilities in its recovery.

2018 - EFFECT OF PARTICLES SIZE OF CRT GLASS WASTE ON PROPERTIES OF POLYMER CONCRETES [Articolo su rivista]
Pozzi, Paolo
abstract

The research has been focused on concretes in which the continuous phase is some kind of polymeric resin and the discrete phase is some type of mineral aggregate. Such composite materials are known as Polymer concretes (PC) and boast several advantages such as lower weights, higher resistance to corrosive environments and chemical attacks, faster curing and lower permeabilities

2018 - GASIFICATION OF BIOMASS FROM RIVER MAINTENANCE AND CHAR APPLICATION IN BUILDING MATERIALS PRODUCTION [Articolo su rivista]
Vezzali, Vittorio; Andreola, Nora Maria; Barbieri, Luisa; Lancellotti, Isabella; Pozzi, Paolo; Allesina, Giulio; Pedrazzi, Simone; Tartarini, Paolo
abstract

This paper exposes the research activities regarding REBAF (Energetic Recover of River Biomasses) project, focused on the maintenance operations self-sustainability of the Secchia river (Italy). Poplar was found as the most abundant and representative wood plant of Secchia riverbanks, with a good behavior during gasification process: from 1 hectare of maintenance every three year, it was possible to produce 23 MWh of electrical power and 31 MWh of thermal power. The biochar obtained was characterized and mixed with local red clay to create both lightweight aggregates (LWAs) for green roofs applications and bricks. Ashes coming from the gasifier cyclone were characterized and used to create bricks. The aims are the saving of raw materials and the obtaining of weight-lightened products with high porosity. Biochar and ashes were found to be suitable for this purpose given their organic carbonaceous nature, according to X-ray diffractometry, Loss on Ignition (LOI) and TG-DTA results. Application on LWAs by substituting 15%wt of the clay with biochar leads to a weight-lightening of the material. To optimize LWAs pH, spent coffee grounds (SCG) were added with proportion of 85% clay-15% biochar/SCG. A greater decrease in weight and pH values in the neutrality range were observed. Adding 20%wt biochar or ashes on bricks led to a significant reduction of materials bulk density (from 2 to 1.5 g/cm3) and the achievement of 40-45% porosity. With higher additions (until 40%wt) bulk density gets lower (1.2 g/cm3–1.3 g/cm3), but the material results weaker with a worst mechanical strength.

2018 - PROCEDIMENTO PER UTILIZZARE CHAR DA GASSIFICAZIONE E/O PIROLISI CON ALTRI SCARTI INDUSTRIALI PER LA FORMULAZIONE DI MATERIALI ALLEGGERITI CON EFFETTO FERTILIZZANTE E DI MATERIALI POLIMERICI PER ISOLAMENTO TERMICO [Brevetto]
Allesina, Giulio; Andreola, Fernanda; Tartarini, Paolo; Lancellotti, Isabella; Pedrazzi, Simone; Vezzali, Vittorio; Pozzi, Paolo; Barbieri, Luisa
abstract

L’invenzione si riferisce ad un procedimento per utilizzare char da gassificazione e/o pirolisi con altri scarti industriali per la formulazione di materiali, in particolare materiali alleggeriti con effetto fertilizzante e materiali polimerici per isolamento termico. L’invenzione consiste nell’utilizzo di char ottenuto da processi di gassificazione/pirolisi di biomasse vegetali legnose all’interno di due tipologie di materiale: 1) Aggregati leggeri fertilizzanti, a base di argilla locale, ottenuti mediante trattamento termico. Il ruolo del char è inteso come agente porizzante mentre l’effetto fertilizzante è dato da un vetro appositamente preparato e ingegnerizzato, contenente fosforo e potassio. L’uso di questo vetro permette il rilascio controllato dei nutrienti nel tempo. 2) Pannelli per isolamento termico a base di polimeri (poliuretano) in campo edilizio dove il char funge da additivo per miglioramento delle proprietà termiche ed elettriche. I vantaggi principali sono: - Risparmio di materie prime naturali da cava - Risparmio di materia prima «critica» come il fosforo - Valorizzazione del Char in materiali per utilizzi agronomici ed edilizia sostenibile - Ottenimento prodotti poliuretanici per isolamento edilizio dalle proprietà carbon sink - Miglioramento proprietà termiche ed elettriche

2018 - Recycling of thermoplastic polymer by waste car bumper [Relazione in Atti di Convegno]
Pozzi, Paolo
abstract

Green and circular economy

2018 - Riciclo di cellulosa nella produzione di poliuretano espanso [Relazione in Atti di Convegno]
Pozzi, Paolo
abstract

Studio utilizzo della cellulosa di riciclo nella produzione di schiume poliuretaniche

2016 - Mechanical and chemical resistance of composite materials with addition of anaerobic digestate, [Articolo su rivista]
Taurino, Rosa; Lancellotti, Isabella; Tatàno, Fabio; Carchesio, Manuela; Pozzi, Paolo
abstract

Bioenergy, produced through the anaerobic digestion (AD) of renewable organic feedstocks, is considered to be one of the highly promising alternatives to fossil-derived energy. The digestate residues obtained from AD finalized to bioenergy production have recently begun to be recognized as underutilized natural resources that have unrecognized value. This work is focused on the new added valorization of digestates obtained from the AD of organic substrates. Effect of digestates treatments and concentration on the properties of composites were investigated. The results obtained showed increase of mechanical and chemical resistance of composites by the heat treatment of digestates. Composite having 30% unsilanized calcined-digestate fillers was found to have the highest chemical and mechanical properties.

2015 - New polyester composites from recycling glass [Relazione in Atti di Convegno]
Pozzi, Paolo; Taurino, Rosa
abstract

The rising concern towards environmental issues and, on the other hand, the management of industrial wastes has led to increasing interest about new materials with low environmental impact. In our study, the possibility to use WEE glass waste as raw material in composite materials with a composition typical of a solid surface, converting them from an environmental and economic burden to a profitable added-value-resource, has been investigated. Solid surfaces are manufactured from a polymeric materials, while the fillers are quartz and several granules may also be added to enhance the colour effects. In this work it was studied the possibility to obtain a product having the same properties of a solid surface material, such as high modulus and flexural strength, good household chemicals resistance, good impact represents by using the glass waste as fillers with a decrease of raw material consumption.

2015 - Studio del riciclo di poliaccoppiati a matrice cellulosica [Relazione in Atti di Convegno]
Pozzi, Paolo; Schillaci, Marta; Generali, Andrea
abstract

Studio riciclo di poliaccoppiati a matrice cellulosica

2015 - Utilizzo di rifiuti a matrice organica/inorganica nella produzione di Laterizi [Relazione in Atti di Convegno]
Pozzi, Paolo; Sasi, Ettore
abstract

Lo scopo dell’attività era lo sviluppo di tecniche e procedure per la possibile valorizzazione di rifiuti a matrice organica/inorganica, di varia provenienza, all’interno del ciclo di produzione dei laterizi. L’obbiettivo finale era di definire il possibile recupero dei rifiuti all’interno dei laterizi, e il tipo di pretrattamento da effettuare sui rifiuti per renderli compatibili con gli impasti da laterizio.

2014 - A process for recycling polylaminate materials [Brevetto]
Pozzi, Paolo; Schillaci, Marta; Generali, Andrea
abstract

A process for recycling polylaminate starting material comprising the following steps: providing an amount of the starting material; shredding the starting material; macerating the shredded material, so as to obtain a primary mixture; subjecting said primary mixture to turbo-dissolution, so as to obtain a secondary mixture; filtering said secondary mixture, so as to define a moist pulp; and drying at least one semifinished product constituted by said pulp, so as to obtain a recycled material.

2014 - An efficent and fast analytical procedure for the bromine determination in waste electrical and electronic equipment plastics [Articolo su rivista]
Taurino, Rosa; Cannio, Maria; Manfredini, Tiziano; Pozzi, Paolo
abstract

n this study, X-ray fluorescence (XRF) spectroscopy was used, in combination with micro-Raman spectroscopy, for a fast determination of bromine concentration and then of brominated flame retardants (BFRs) compounds in waste electrical and electronic equipments. Different samples from different recycling industries were characterized to evaluate the sorting performances of treatment companies. This investigation must be considered of prime research interest since the impact of BFRs on the environment and their potential risk on human health is an actual concern. Indeed, the new European Restriction of Hazardous Substances Directive (RoHS 2011/65/EU) demands that plastics with BFRs concentration above 0.1%, being potential health hazards, are identified and eliminated from the recycling process. Our results show the capability and the potential of Raman spectroscopy, together with XRF analysis, as effective tools for the rapid detection of BFRs in plastic materials. In particular, the use of these two techniques in combination can be considered as a promising method suitable for quality control applications in the recycling industry.

2014 - Elastomeric compositions comprising usnic acid and devices made thereof or coated therewith [Brevetto]
Guerra, Emanuele; Pizzoni, Angelo; Pozzi, Paolo
abstract

The present invention refers to elastomeric compositions useful for making and/or coating medicated devices. The invention also refers to such medicated devices, and a process for making and using thereof.

2014 - Studio sul riciclo di TPU proveniente dalla filiera dello sci alpini [Relazione in Atti di Convegno]
Pozzi, Paolo; Davoli, Giacomo; Bon, Federico De
abstract

Sviluppo di una filiera di riciclo del poliuretano termoplastico proveniente dalla produzione di materiale tecnico per sci alpini

2013 - New composite materials based on glass waste [Articolo su rivista]
Taurino, Rosa; Pozzi, Paolo; G., Lucchetti; L., Paterlini; Zanasi, Tania; Ponzoni, Chiara; F., Schivo; Barbieri, Luisa
abstract

Recycling of exhausted fluorescent tubes and lamps decreases environmental contamination from mercury, cadmium, lead and rare-earth phosphorous salts. In this study fluorescent glass waste were reused as raw material in composite materials to convert them from an environmental and economic burden to a profitable, added-value-resources. The effect of coarse and fine glass particles in the resin was studied by preparing mono and bi-layer composites. The properties of composites, including impact resistance, scratch resistance, flexural properties and chemical properties (water, acid and basic resistance) were examined. Based on the findings of this work, it appears evident that the bi-layer composite provided better mechanical properties.

2012 - WEEE: No waste anymore but secondary raw material [Capitolo/Saggio]
Andreola, Nora Maria; Barbieri, Luisa; Cannio, Maria; Giovanardi, Roberto; Lancellotti, Isabella; Pozzi, Paolo; Soragni, Ercole
abstract

The management of Waste Electrical and Electronic Equipment (WEEE) is a topic of great interest, now being an integral part of the Italian D.Lgs. 151/2005. In order to protract life cycle of this waste, composed by glass, polymers and metals, a great effort is done to develop separation, reclamation, recycling and recovery techniques. This study reports the results achieved on the characterization of different materials constituting TV sets and computers, low environmental impact techniques of extraction and recovery of precious metals from electronic circuitry and the use of glassy components as secondary raw material in the ceramic field instead of virgin compounds.

2011 - Injection molding simulation: a comparison between two different software [Poster]
Davoli, Giacomo; Pozzi, Paolo; Ognibene, Tiziano
abstract

Tu Study injection molding simulation of two different software

2011 - Injection molding simulation: optimization analysis of a slide guide [Poster]
Davoli, Giacomo; Pozzi, Paolo; Ognibene, Tiziano
abstract

Optimization analysis of a component with software sinulation

2010 - Facile characterization of polymer fractions from waste electrical and electronic equipment (WEEE) for mechanical recycling [Articolo su rivista]
Taurino, Rosa; Pozzi, Paolo; Zanasi, Tania
abstract

In view of the environmental problem involved in the management of WEEE, and then in the recycling of post-consumer platic of WEEE there is a pressing need for rapid measurement technologies for simple identification of the varius commercial plastic materials and of the several contaminants, to improve the recycling of such wasters.

2010 - New polypropylene/glass composites: effect of glass fibers from cathode ray tubes on thermal and mechanical properties [Articolo su rivista]
Pozzi, Paolo; Taurino, Rosa; Zanasi, Tania; Andreola, Nora Maria; Barbieri, Luisa; Lancellotti, Isabella
abstract

This study investigated the feasibility of using fibers obtained by the recycling of end life cathode ray tubes glasses (EOL-CRT glass) as new filler for polypropylene material. The effects of these new fiberson the mechanical properties of plastic composites were studied. Fracture surfaces were investigatedby scanning electron microscopy. Based on the findings of this work, it appears evident that these newfibers can be used instead of commercial glass fibers providing good mechanical and thermal properties.Moreover the matrix modification in the hybrid composite led to better mechanical performances.

2010 - The application of combined thecniques for the management of WEEEplastics [Relazione in Atti di Convegno]
Pozzi, Paolo; Taurino, Rosa; Zanasi, Tania
abstract

Recycling of WEEE plastics is big chyallenge, mainly due to the presence of different polymer types and to the presence of brominated flame retardants. This research i focused on the rapid characterization by various analytical techniques FTIR, DSC, XRF, EDS.

2009 - Analisi ambientale della gestione dei rifiuti con il metodo LCA [Monografia/Trattato scientifico]
P., Neri; F., Falconi; G., Olivieri; Ferrari, Anna Maria; Barbieri, Luisa; Lancellotti, Isabella; Pozzi, Paolo; M., Cervino; R., Gallimbeni
abstract

www.lcarifiuti.net - Questo sito ospita una pubblicazione in linea dedicata all'analisi ambientale della gestione dei rifiuti con il metodo LCA. Ha l’obiettivo di fornire gli strumenti principali per uno studio di analisi del ciclo di vita (Life Cycle Assessment - LCA) del processo di gestione dei rifiuti: una Introduzione, le linee guida per l’applicazione del metodo LCA, una raccolta di processi creati per i casi studio, le sintesi di molti degli studi effettuati. Nella pubblicazione sono presenti inoltre una breve descrizione del metodo LCA e dei Metodi per la valutazione del danno, una proposta di uso dei processi di riciclo e di incenerimento come processi generatori di coprodotti (processo multi-output), una Bibliografia e un Glossario.

2009 - Using injection moulding technology for polyolefin recycling [Capitolo/Saggio]
Pozzi, Paolo; Taurino, Rosa; Zanasi, Tania
abstract

The employment of plastic material in different application fields, as food packing, automotive industry and building sector, permitted to mett the needs of producers and consumers,but it produced a disposal problem.One of the main problems in polymer recycling is the presence of different material. The activity aimed at obtaining materials from using injection moulding technology for different polymer.

2008 - Quantitative analisis of recycled polyolefines by means of high temperature liquid state 1H and 13C NMR [Articolo su rivista]
M., Marini; Pozzi, Paolo
abstract

PE/PP post-consumer blend ware analyzed by novel H and C13 NMR for quantitative data about PE/PP ratio

2008 - Tecniche di analisi chimica quantitativa su miscele PE/PP in polimeri riciclati [Abstract in Atti di Convegno]
Pozzi, Paolo; R., Taurino; T., Zanasi
abstract

Viene illustrata una tecnica di analisi di miscele di pp/pe per definire il rapporto tra i due polimeri

2007 - LEGISLATIVE, TECHNOLOGICAL, ADMINISTRATIVE, ECONOMICAL AND ORGANIZATIONAL ASPECTS OF THE EXECUTIVE RAEE AND ROHS [Relazione in Atti di Convegno]
Barbieri, Luisa; Cannio, Maria; Cassanelli, Giulia; Colombo, Paolo; Pozzi, Paolo; Rabitti, Daniela; Rimini, Bianca; Rovati, Luigi
abstract

-The Italian Decree D. Lgs. n. 151/2005 and subsequent changes and supplements in agreement with Directives WEEE 2002/96/CE and 2003/108/CE “for the recovery and recycling of waste from electric and electronic equipments” and Directive RoHS 2002/95/CE “on the restriction of the use of certain hazardous substances in electrical and electronic equipment” has been analysed here. In particular, the aim of this work is to introduce legal, technological, administrative outcomes about interpretation and application of the D. Lgs. 151/2005. The main legislative novelty is represented by the Extended Producer Responsibility (EPR) that it is transferred in the burden of producers and distributors which have to support economically national systems for the WEEE recovery and treatment at the end of life. The correct management of the WEEE nevertheless, parallel of new requirements, offers to the producers stimulating opportunity both in the field of Integrated Product Policy and in the optimization of the distribution/collection nets.

2007 - Studio delle caratteristiche di miscele di polipropilene da riciclo con polipropilene vergine [Relazione in Atti di Convegno]
Pozzi, Paolo
abstract

Viene analizzata l'influenza sulle proprietà fisico-meccaniche di PP da riciclo, dell'aggiunta di PP vergine in % fino al 30%

2006 - Caratterizzazione di paraurti da riciclo [Relazione in Atti di Convegno]
D., Belviso; Pozzi, Paolo
abstract

viene valutato il possibile riciclo di paraurti in pp

2006 - Production of urban stree pavement utilizing injection moulding technology with recycled thermoplastic polymers [Monografia/Trattato scientifico]
D., Belviso; Pozzi, Paolo
abstract

The obyective is tha realization of the urban street pavement whit recycled thermoplastic polymers

2006 - RF thermal plasma treatment of waste glass and its reutilization in composite materials [Articolo su rivista]
V., Colombo; E., Ghedini; G., Masini; D., Russo; Andreola, Nora Maria; Barbieri, Luisa; Belviso, Daniela; Lancellotti, Isabella; Pozzi, Paolo
abstract

Fluorescent lamps glass powders are sieved in two particle size ranges and are subjected to thermal plasma in-flight treatment by injection into the discharge of a Tekna PL-35 plasma torch and reaction chamber as part of a source operated at 3MHz with a maximum power of 25kW, with Ar as plasma and carrier gas and N2 as sheath gas. The sieved powders and the plasma treated ones have been characterized by powder XRD and particle size analysis in order to verify if the plasma treatment can induce modification in the mineralogical and physical characteristics. The spherical shape of the particles have been analyzed by scanning electron microscopy. Moreover, this technique has allowed to verify if the plasma treatment can induce modification of the (qualitative) chemical composition of the powder. Results for various operating conditions and injection probe positions are presented. The spherical powders have been then introduced in thermoplastic polymer (polypropylene) in place of glass spheres usually used, and the results are compared to each others. The samples are characterized by mechanical tests (flexural strength) and microstructural analysis (SEM) in order to verify the differences in materials properties obtainable by mean of conventional and plasma assisted processes.

2006 - Studio della miscelazione di poliolefine con polimeri vergini [Relazione in Atti di Convegno]
D., Belviso; Pozzi, Paolo
abstract

viene studiato il riciclo di pp da imballaggi tramite stampaggio ad iniezione

2005 - Recycling industrial waste in brick manufacture. Part 1 [Articolo su rivista]
Andreola, Nora Maria; Barbieri, Luisa; Lancellotti, Isabella; Pozzi, Paolo
abstract

The ongoing accumulation of industrial waste speaks to the need to seek cost-effective disposal methods. Brick manufacture would appear to be particularly promising in this regard. The present study analyzes the possibility of recycling the sludge generated in porcelain tile polishing, as well as coal, steel and municipal incinerator ash to make a special type of facing brick whose properties readily accommodate a full analysis of all the problems deriving from the incorporation of residue in its manufacture. Physical-chemical, mechanical and structural analyses were performed on bricks made with varying percentages of the different types of waste considered. This first paper reports the results of the physical and technological characterization of the products; the second part of the research will address their chemical, mechanical and structural properties.

2005 - Utilizzo di plastiche da riciclo per la produzione di arredo urbano per acquisti verdi.Un progetto integrato” [Relazione in Atti di Convegno]
Pozzi, Paolo; A., Sansone
abstract

studio sviluppo di manufatti per arredo urbano con plastiche da riciclo

2003 - Inorganic wastes as new resource of materials [Relazione in Atti di Convegno]
Barbieri, L.; Lancellotti, A.; Corradi, A.; Andreola, F.; Pozzi, P.
abstract

Recycling and valorisation of waste materials coming from municipal and industrial processes has become an urgent problem. Moreover, national regulations are reinforcing environmental protection measures, thus rendering the development of new recycling technologies necessary and convenient. By considering that both the ceramic industry is a high consumer of natural raw materials and these materials develop crystalline phases and glassy matrices capable to block the wastes it is easy to understand that the ceramic sector represents an important reference point for the recycling of wastes. The experimental work has been carried out by mixing incinerator bottom ash and steel ash in both a ceramic paste for red single firing and in a body for facing bricks. The samples characterisation has been conducted by means of linear shrinkage, water absorption, density, porosity, crystalline phases identification, plasticity, loss in weight and surface defects. From this feasibility study, can be evinced that both the processes allow the introduction of wastes in terms of chemical, physical, mineralogical and esthetical compatibility, in particular for percentage up to 5wt% because higher percentage causes major modifications in the standard bodies.

2002 - Riciclaggio di materiali di scarto nalla produzione di laterizi (Prima parte) [Articolo su rivista]
G., Maranci; Pozzi, Paolo
abstract

viene illustrata una tecnica di inertizzazione in situ di rifiuti ceramici

2002 - Riciclaggio di materiali di scarto nella produzione di laterizi (seconda parte) [Articolo su rivista]
G., Maranci; Pozzi, Paolo
abstract

studio ricilo materiali di scarto in mattoni faccia a vista

2002 - The influence of the Mean Free Path between Particles on the apparent Viscosity of Clay Slips [Articolo su rivista]
J. B., RODRIGUES NETO; A. P., NOVAES DE OLIVEIRA; O. E., Alarcon; Pozzi, Paolo; Andreola, Nora Maria
abstract

Studies of the rheological behaviour of clay suspension

2001 - Influence of ionic environment and pH on the electrokinetic properties of ball clays [Articolo su rivista]
Galassi, C; Costa, Al; Pozzi, Paolo
abstract

Three ball days (SP from England, TSMA from France and UK from the Ukraine) were characterized for their dry and wet colloidal properties. On the basis of X-ray diffraction and chemical analyses the clays were classified as kaolinite-rich clay, smectitic kaolinite-rich clay and illitic kaolinite-rich clay. The 5 (zeta) potential at the clay-water interface as a function of pH, in three different electrolytes, was investigated using an electroacoustic technique. Starting from measurements of dynamic mobility, the calculated 5 potential was found to be almost constant as a function of pH for the TSMA and UK clays, while it increased from -20 to -60 for the SP clay, when potassium nitrate was used as an electrolyte. The behavior of the three clays in calcium and magnesium nitrate was slightly different: SP showed a smaller increase in 5 potential, while a small deviation from the constant behavior of the UK clay was found. The results are explained in terms of the surrounding-ion atmosphere in light of the chemical-physical properties measured. Our results may well be of use to those involved in ceramic processing.

1999 - Influence of the operative parameters on chemical durability and rheological behavior frits ceramic suspensions. [Relazione in Atti di Convegno]
Andreola, Nora Maria; D., Bernardelli; Romagnoli, Marcello; Pozzi, Paolo
abstract

Glaze application is the phase in a productive process that is more conditioned from the rheological properties of the glaze itself. During the preparation step in the mill, at moderately high temperatures (60-70°C), reactions between frits and the aqueous medium can occur and consequently begin the leaching of glassy network and the diffusion of the modifying ions through the leached frit layer. In the industrial process, variations on the pH and the ionic strength of glaze suspensions happen during the milling. Consequently changes on the rheological parameters (apparent viscosity, yield point, thixotropy) of glaze suspensions will verified. It is important to control these variables for keeping unaffected the aesthetic characteristics of the final products, after firing.

1999 - Reologìa de suspensiones de esmaltes cerámicos para monococción: estudio de la influencia de los aditivos utilizados. [Articolo su rivista]
Andreola, Nora Maria; Pozzi, Paolo; Romagnoli, Marcello
abstract

En este trabajo se presentan los resultados obtenidos a partir de la caracterización y el estudio del comportamiento reológico de suspensiones de fritas cerámicas para la elaboración de esmaltes para baldosas de monococión porosa.En particular se evidencian los efectos que los distintos componentes y aditivo, ejercen sobre los parámetros reológicos que oontrolan las fases de preparacion y de aplicación

1998 - Caratterizzazione di sospensioni acquose di fritte ceramiche additivate di materiali plastici [Relazione in Atti di Convegno]
Andreola, Nora Maria; Pozzi, Paolo; Romagnoli, Marcello
abstract

Caratterizzazione di sospensioni acquose di fritte ceramiche additivate di materiali plastici

1998 - Rheological behavior of an STP deflocculated kaolin [Articolo su rivista]
Andreola, Nora Maria; Pozzi, Paolo; Neto, Jbr
abstract

Work attempts to characterize a physical chemical parameter responsible for fluctuations in the efficiency of STP's deflocculant ability in industrial use.

1998 - Rheological behavior of kaolin acqueous suspensions deflocculated with sodium tripolyphosphate at different ratio of crystalline phase [Articolo su rivista]
Andreola, Nora Maria; J. B., Nieto; Pozzi, Paolo
abstract

Rheological behavior of kaolin suspensions deflocculated with sodium tripolyphosphate at different ratio of crystalline phase

1998 - Utilizzo di scorie da inceneritore urbano nella produzione di gres porcellanato [Articolo su rivista]
Andreola, Nora Maria; Barbieri, Luisa; Lancellotti, Isabella; F., Mavridis; Pozzi, Paolo
abstract

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1997 - Impiego di carbossimetilcellulose come leganti negli smalti ceramici : studio del comportamento reologico [Relazione in Atti di Convegno]
Andreola, Nora Maria; R., Lapasin; Pozzi, Paolo; Romagnoli, Marcello
abstract

Studio reologico dell'aggiunta di CMC in sospensioni di smalti ceramici per piastrelle.

1997 - Sintering and modification of porous structure caused by binders added to whiteware body composition [Relazione in Atti di Convegno]
Andreola, Nora Maria; Romagnoli, Marcello; Pozzi, Paolo
abstract

The behavior of 2 viscosity-grade polyvinyl alcohols. was studied at 2 different percentages added to the slurry used for the preparation of tableware by isostatic pressing. The modification of the porous structure, the apparent d., and the elimination of the binder were examined. Results obtained show that binders do not modify the reactions during the firing process. More evident differences are verifiable in the porosity of the green and fired bodies, according to their mol. wt. and concn. Porosity decreased until 350°C (200°C for the binder with high mol. wt.), while from 450°C (350°C high wt. binder) to 700°C it increased quickly. At higher temps., as an effect of sintering, porosity fell dramatically to <3% and residual porosity is concd. in large pores. Effect of mol. wt. is to det. a higher porosity using the binder with longer chain while the bulk d. is lower. The green body with higher percentage of adhesive presents a lower open porosity and bulk d.

1997 - Wet grinding ceramic frits: effects of the size of the grinding media, grinding time and solid content. [Articolo su rivista]
Andreola, Nora Maria; Pozzi, P.; Romagnoli, Marcello
abstract

The effect of variables in the wet grinding process, such as the size of the grinding media, grinding time and solid content, was investigated using an aq. suspension of glassy frit, typically used for the prodn. of glazes in the manuf. of ceramic tiles. The aim was to examine the process parameters which will enable optimization of the grinding process for brittle materials. The frit was ground with three mill charges, formed of sintered alumina balls of different sizes, and the particle size dimensions were measured as a function of grinding time and of the amt. of solid content of the aq. suspensions. The results indicate that the mill charge ( ratio of grinding ball diams.), grinding times and solid content of the suspensions must be carefully controlled in order to optimize the grinding process. A lower limit of particle size dimensions, after very long grinding times, was obtained.

1996 - Additives used in the pressing of tableware [Articolo su rivista]
Andreola, Fernanda; Pozzi, Paolo; Romagnoli, Marcello; Bresciani, Andrea; Pasquali, Guelfo
abstract

Reported here is the study of the rheological behavior of three viscosity-grade poly(vinyl alcohol)s added at three concentrations to a slurry that is used for the preparation of tableware by isostatic pressing. The formation of fracture during pressing, mechanical characteristics of the body and recycling of scrap also are reported.

1996 - Additives used in the pressing of tableware [Articolo su rivista]
Andreola, Nora Maria; Pozzi, Paolo; Romagnoli, Marcello; Bresciani, A; Pasquali, G.
abstract

Binder monomer chain length and concentration affect the mechanical behavior of tableware during fabrication by isostatic pressing.

1996 - Comparison of the binding behavior of poly(vinyl alcohol) with varying molecular weight and poly(vinyl acetate) in compositions for white body plates obtained by isostatic pressing. [Articolo su rivista]
Andreola, Nora Maria; Pozzi, P.; Romagnoli, Marcello; Pasquali, G.; Bresciani, A.
abstract

Over the past few years, the isostatic pressing method has been successfully applied for the prodn. of refractories and tableware. This method may be used for the prodn. of practically all shapes of plates, and also for more complex non-sym. pieces. This procedure leads to a rapid expansion of the piece after pressing, possibly resulting in damage. To avoid this problem, binding agents are added to the bodies which are capable of combating the expansion phenomenon. The effects of three types of poly(vinyl alc.) (varying mol. wt.), added in three different quantities, and poly(vinyl acetate) on this expansion phenomenon in the isostatic pressing of plates were examd.

1996 - CONFRONTO TRA IL COMPORTAMENTO LEGANTE Dl ALCOOLPOLIVINILICI A DIVERSO PESO MOLECOLARE E ACETATO Dl POLIVINILE IN COMPOSIZIONI PER PIATTI A IMPASTO BIANCOOTTENUTI PER PRESSATURA ISOSTATICA [Articolo su rivista]
Andreola, Nora Maria; Pozzi, Paolo; Romagnoli, Marcello; G., Pasquali; A., Bresciani
abstract

La pressatura isostatica, negli ultimi anni, e stata applicata con successo nella fabbricazione di refrattari e stoviglieria, può essere utilizzata nella fabbricazione di quasi tutte le forme di piatti e anche di articoli più complessi non simmetrici; tale procedimento tuttavia presenta il fenomeno della rapidaespansione del pezzo dopo la pressatura, con conseguente danneggiamento del manufatto. Al fine di evitare l'inconveniente si aggiungono all'impasto leganti in grado di opporsi all'espansione. Il lavoro qui riportato riferisce sui risultati ottenutidall'impiego di tre alcool polivinilici, aggiunti in tre diverse percentuali in barbottine utilizzate per la preparazione di piatti con la pressatura isostatica.

1996 - Studio della tempo dipendenza in presenza di effetti irreversibili in sospensioni di fritte ceramiche [Relazione in Atti di Convegno]
Andreola, Nora Maria; R., Lapasin; Pozzi, Paolo; Romagnoli, Marcello
abstract

Studio della tempo dipendenza in presenza di effetti irreversibili in sospensioni di fritte ceramiche

1995 - La depuracion y el reciclaje de residuos en la industria ceramica de baldosas [Articolo su rivista]
Andreola, Nora Maria; Manfredini, T.; Pellacani, G. C.; Pozzi, Paolo
abstract

Studio dell'utilizzo di residui della depurazione di acque industriali in materiali ceramici

1995 - Recycling of Ceramic wastes to reduce pollution [Articolo su rivista]
Andreola, Nora Maria; Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, Paolo; Romagnoli, Marcello
abstract

Exhausted limes and sludges (containing prevalently glass frits and glaze components), are waste substances to be eliminated. Recycling of about 0.10-0.15 wt% of exhausted lime and about 0.50 wt% of glass frits permits their complete elimination without affecting the industrial process. Release tests demonstrate as the firing process acts in the inertization of soluble heavy-metals ions.

1995 - Reologia di sospensioni acquose di argille deflocculate con TPF a differenti fasi cristalline [Relazione in Atti di Convegno]
Andreola, Nora Maria; Pozzi, Paolo; Romagnoli, Marcello
abstract

Reologia di sospensioni acquose di argilla deflocculate con tripolifosfato di sodio a differenti fasi cristalline.

1994 - CONCENTRATED GLAZE SUSPENSIONS [Articolo su rivista]
Andreola, Nora Maria; Corradi, Anna; Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, Paolo
abstract

The effect of grinding time, solid slip content, kaolin plasticizer and Ca2+ flocculating agent on the rheological behavior of a typical industrial frit used in glazes for monoporosa wall tile are described.

1994 - Deflocculation of concentrated aqueous clay suspensions with sodium polymethacrylates [Articolo su rivista]
Corradi, Anna; Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, Paolo
abstract

The ability of sodium polymethacrylate salts with various molecular weights (1200 to 30000 g.mol(-1)) to deflocculate concentrated aqueous suspensions (58 wt%) of two clays, widely used for stoneware ceramic tile production, was investigated. Rheological measurements were made in distilled water or in water containing calcium ions (O to 6 x 10(-3) mol.dm(-3)) to evaluate the practical applications of these salts as deffocculants in the ceramic tile industry. All slips presented a non-Newtonian behavior. Polymethacrylates with low molecular weights were the most efficient deflocculants for clay suspensions. The salts acted by an essentially electrosteric stabilization mechanism, in combination with a high sequestering ability toward flocculating cations. For their efficient deflocculating capabilities toward concentrated aqueous clay suspensions, sodium(I) polymethacrylates may be considered for practical industrial application, in particular for the preparation of liquid deflocculants.

1994 - La reologia dei materiali ceramici tradizionali [Curatela]
Pozzi, Paolo; Carmen, Galassi
abstract

raccolta di contributi sulla misura delle caratteristiche reologiche di sospensioni ceramiche

1994 - Rheological behaviour of aqueous concentrated suspensions of an Italian zeolite [Articolo su rivista]
Andreola, Nora Maria; Manfredini, T.; Pellacani, G. C.; Pozzi, Paolo; Romagnoli, Marcello
abstract

The paper reports a laboratory study on the rheological behaviour of concentrated aqueous suspensions of zeolitite, belonging to the geological formations of «tufo giallo napoletano» in the Phlegraean Fields (Campania). Rheological measurement performed by means of a rotational viscometer demonstrated how the suspensions show a practically newtonian behaviour up to about 40 wtOfo of solid content in absence of deflocculants and up to about SO wtOfo of solid content in presence of Na-SIL and Na-TPP detlocculants. At higher solid concentrations they assume a non-newtonian behaviour. Na-TPP shows a greater deflocculating ability toward zeolite suspensions than Na-SIL. This may be explained by considering, in particular, its sequestering action towards the flocculating ions.

1994 - Unigeomix: trattamento in situ di rifiuti tossici e nocivi mediante processo di stabilizzazione/solidificazione, direttamente nel sottosuolo,applicato a residui provenienti dall'industria ceramica (parte II) [Articolo su rivista]
G., Maranci; Pozzi, Paolo
abstract

studio inertizzazione in situ di rifiuti ceramici tramite silico-alluminati complessati

1994 - Utilization of an Italian zeolitite in ceramic bodies [Articolo su rivista]
Andreola, Nora Maria; Manfredini, Tiziano; Passaglia, Elio; Pellacani, Gian Carlo; Pozzi, Paolo; Romagnoli, Marcello
abstract

UTILIZATION OF ITALIAN ZEOLITITE IN CERAMIC BODIESThe papers reports a laboratory and industrial study on the possibility of using an Italian natural zeolitite, both in natural and Pb-; Ba- exchanged form, in a tile ceramic body. Because of their exchangeable cation contents (Na+, K+; Ca+2, Ba+2, Pb+2), natural and exchanged zeolitites can be added (up to 20 and 5wt%, respectively) in a ceramic body, thus favouring its sinterability and unaffecting the crystalline phase formation and the final products characteristics. The addition of higher amounts enhaces the swelling of the tiles during firing and strongly modifies the features of the fired tiles. Release tests in acetic and nitric acid solutions on unfired and fired tiles containing exchanged zeolitites demostrated the inertization of lecheable Pb+2 during firing.

1993 - Addition of exhausted lime in ceramic bodies: possibilities for an environmentally compatible tile production [Articolo su rivista]
Andreola, Nora Maria; L., Bonfatti; Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, Paolo; Romagnoli, Marcello
abstract

Pollution caused by inorganic wastes in the traditional ceramics industry is minimised by utilising exhausted limes, which are the byproducts in bag filters after the purification of flue gases in wet tile production. This study determined which quantities of exhausted lime added to tile bodies did not significantly affect the physico-chemical properties of the slips (i.e. density /viscosity/deflocculant amount) during wet grinding in ball mills. The results demonstrated that these conditions are obtained when exhausted lime in the bodies does not exceed 0.10 to 0.12 mass%. Furthermore, any increase in fluorine emission in the firing of tiles with exhausted lime can be trapped in the bag filters by increasing the lime content by about 10 mass%. The laboratory and industrial results are also compared.

1993 - Addition of exhausted lime in ceramic bodies: possibilities for an environmentally compatible tile production III: Industrial Results [Articolo su rivista]
Andreola, Nora Maria; Bonfatti, L.; Manfredini, T.; Pellacani, G. C.; Pozzi, Paolo; Romagnoli, Marcello
abstract

study uses exhausted lime in ceramic

1993 - Preparation end properties of fast-fired porcelain tiles containing natural chromite [Articolo su rivista]
Corradi, Anna; Leonelli, Cristina; Manfredini, Tiziano; Pozzi, Paolo; Romagnoli, Marcello
abstract

Natural magnesium iron chromite can be used as a pigment for coloring high-sintered porcelain tiles. However, it is important to control the amount, firing time and temperature, and size distribution of the chromite powders to produce different color shades of the fired tiles from gray to black.

1993 - Recycling of ceramic wastes in tile bodies to reduce pollution [Articolo su rivista]
Andreola, Nora Maria; Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, Paolo; Romagnoli, Marcello
abstract

During recent years, special attention has been devoted both to solving pollution problems during the manufacturing of ceramics and to learning how ceramics can themselves be a solution. Waste encapsulation opportunities for structural clay products have been studied. These opportunities affect environmental isolation within the semivitreous matrix of the product and remove and destroy volatile organic components of the waste and recrystallized incinerator slags and encapsulant for such heavy metals as lead. To reduce hazards to workers and community and to realize a safe environment, some manufacturers have planned for a production process that recycles wastes. This plan represents the best option to reduce or minimize pollution by permitting the complete elimination of wastes and thus avoiding their very expensive storage in appropriate dumps. Studies have been performed to evaluate the effects of the presence of exhausted lime and sludges in tile bodies and to obtain information for the rationalization of the recycling process. The focus has been on the evaluation of the effects of the presence of wastes on the rheological and thermal behavior of the tile bodies. In addition, the efficiency of the firing process on the wastes and heavy-metals inertization has been determined by release tests of the fired products in different acidic media.

1993 - Rheology of a Low-Plastic Ceramic Body Containing Na-Bentonite. [Relazione in Atti di Convegno]
FERNANDA ANDREOLA, N. M.; Manfredini, T.; Pellacani, G. C.; Pozzi, Paolo; Romagnoli, Marcello
abstract

This paper reports the results of a study on the rheological behavior of slips prepared using a low-plastic body with 0-4 wt% of alkali-activated bentonite added as strengthening agent. The presence of bentonite increases the plasticity of the slips and their viscosity and thixotropy, and addition of bentonite to about2 wt% does not greatly affect the rheological conditions that regulate the industrial steps. Higher percentages of bentonite strongly modify the rheology of the slips, and in order for them to be workable, it is necessary to reduce the solid content and/or amounts of deflocculant greater than 0.5 wt%.

1993 - Unigeomix: trattamento in situ di rifiuti tossici e nocivi mediante processo di stabilizzazione/solidificazione, direttamente nel sottosuolo, applicato a residui provenienti dall'industria ceramica (parte I) [Articolo su rivista]
G., Maranci; Pozzi, Paolo
abstract

Studio dell'inertizzazione di rifiuti ceramici direttamente in situ,utilizzando silico-alluminati complessati.

1992 - addition of exhausted lime in ceramic bodies: possibilities for an environmentally compatible tile production I: rheological of slips [Articolo su rivista]
Andreola, Nora Maria; Bonfatti, L.; Manfredini, T.; Pellacani, G. C.; Pozzi, Paolo
abstract

study of the rheology of ceramic suspension with recicling material presence

1992 - Addition of exhausted lime in ceramic bodies:possibilities for an environmentally compatible tile production II:thermal behaviour of bodies [Articolo su rivista]
Andreola, Nora Maria; Bonfatti, L.; Manfredini, T.; Pellacani, G. C.; Pozzi, Paolo
abstract

study uses exhausted lime in ceramic

1992 - STRUCTURAL AND SPECTROSCOPIC CORRELATIONS IN CADMIUM(II) HALIDE-COMPLEXES OF 2,2-DIMETHYLPROPANE-1,3-DIAMINE [Articolo su rivista]
Masciocchi, N; Moret, M; Sironi, A; Bruni, S; Cariati, F; Pozzi, Paolo; Manfredini, Tiziano; Menabue, Ledi; Pellacani, Gian Carlo
abstract

Compounds of formula Cd(dmpd)2X2 (dmpd = 2,2-dimethylpropane-1,3-diamine; X = Cl, Br, I) were prepared and investigated by means of structural and spectroscopic (IR and Raman) measurements. The Cd(dmpd)2I2 compound crystallizes in the monoclinic P2(1)/c space group, with two formula units in a cell of dimensions a = 6.235 (5) angstrom, b = 18.462 (9) angstrom, c = 8.294 (5) angstrom, and beta = 93.37 (6)-degrees, with R = 0.039 and R(w) = 0.044. The structure consist of discrete [Cd(dmpd)2I2] monomeric units, where the Cd atom is surrounded by four nitrogen atoms of two in-plane chelating dmpd molecules and by two iodine atoms asymmetrically coordinated axial positions. The Cd(dmpd)2Br2 compound crystallizes in the triclinic P1BAR space group, with Z = 3 and a cell of dimensions a = 12.713 (2) angstrom, b = 16.592 (2) angstrom, c = 6.281 (3) angstrom, alpha = 91.22 (2)-degrees, beta = 96.67 (2)-degrees, and gamma = 78.72 (3)-degrees, with R = 0.031 and R(w) = 0.036. The structure consists of 1:1 molecular packing of Cd(dmpd)2Br2 monomeric and [Cd(dmpd)2Br2]2 dimeric units. In the monomer the Cd atom is octahedrally coordinated by four in-plane nitrogen atoms of two chelating dmpd molecules and by two bromine atoms in axial positions. The dimer consists of a pair of octahedrally coordinated Cd atoms, related by an inversion center, connected in a 12-membered metallacycle by two ambidentate dmpd molecules. The octahedral arrangement each Cd atom in the dimer is completed by an in-plane chelating dmpd and by two bromine atoms, axially coordinated. The Cd(dmpd)2Cl2 compound is isomorphous with the bromide derivative, with unit cell dimensions a = 12.714 (3) angstrom, b = 16.228 (3) angstrom, c = 6.087 (5) angstrom, alpha = 91.61 (3)-degrees, beta = 96.02 (3)-degrees, and gamma = 77.76 (4)-degrees. The CdN stretching vibrations are discussed and assigned in the light of the known structures.

1991 - CRYSTALLIZATION OF SOME ANORTHITE DIOPSIDE GLASS PRECURSORS [Articolo su rivista]
Leonelli, Cristina; Manfredini, Tiziano; Paganelli, M; Pozzi, Paolo; Pellacani, Gian Carlo
abstract

Anorthite and diopside have been obtained from complete devitrification of glasses belonging to the quaternary system MgO-CaO-Al2O3-SiO2. Microstructure, the natural trend of the nucleation mechanism and kinetic studies on the crystallization phenomenon have been investigated by means of optical and electron microscopies, thermal and thermomechanical techniques and X-ray powder diffractometry. All the glasses investigated show a complete crystallization starting from a simple surface nucleation process. The activation energy for the crystallization process proved to be higher than that for viscous flow, leading to an important aspect modification in the sample during ceramization. Thermal stability and physical properties of both glass and glass-ceramic materials have been tested, suggesting the possible use of these materials in industrial application.

1991 - DISCONTINUOUS WET-GRINDING OF RAW-MATERIALS IN THE PRODUCTION OF TRADITIONAL CERAMIC TILES [Articolo su rivista]
Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, Paolo; Corradi, Anna
abstract

The paper reports a laboratory and semi-industrial study on the discontinuous wet-grinding raw-material process which is widely used in the ceramic tile industry for body preparations. It focuses on the importance of controlling the rheology and particle size distribution of the aqueous suspensions and the mineralogical characteristics and amounts of the grinding residues of three raw materials-two clays (named Badia and Riola), and one sand-and of their 1/1/1 mix, generally used in factories for the production of porous, single-fired ceramic wall tiles. The apparent viscosities of the electrostatically deflocculated slips strongly depend on the grinding times. The highest solids content of the slips, enabling a good industrial workability, is about 55 to 57 wt% for both the clays, 70 to 72 wt% for the sand, and 60 to 62 wt% and 66 wt% for the mix (body) examined in the laboratory and semi-industrial experiments, respectively In all the samples, the weighted grinding residues on the 45-mu-m sieves, formed of the hard unclayey materials. decrease with increasing grinding times, attaining practically constant values at about 20 and 150 min, respectively, in the laboratory and semi-industrial experiments. The optimum apparent viscosity values, which enable the best grinding action on a ceramic body in a drum ball mill, are greater than those required for moving the final slip to the spray dryer. The results suggest that the grinding action is exerted only on the nonplastic materials. Therefore, the individual grinding of the raw materials forming the ceramic body is strongly indicated for optimization of the wet-grinding process. Other useful hints for the rationalization of the wet-grinding process, which may contribute to increasing production, lowering costs, and improving quality, are suggested.

1991 - THE RECYCLING OF CERAMIC SLUDGES IN THE PRODUCTION PROCESS - AN OPTION FOR CERAMIC TILE FACTORIES TO REACH ZERO POLLUTION [Articolo su rivista]
Manfredini, Tiziano; Marzola, G; Nunziello, S; Pellacani, Gian Carlo; Pozzi, Paolo; Tubertini, O.
abstract

The paper considers a way of minimizing the pollution due to ceramic sludges, by rationalizing the addition of waste waters and sludges in tile production processes. The analytical and rheological results, obtained on the body slips used for white gres tile production in waste or purified waters, demonstrate that the addition of dried sludges up to 5% wt (in place of the < 2% wt amount till now used) makes the slip completely compatible with industrial requirements. This paper evidences the possibility of direct use of waste waters, containing sludges, in the wet grinding process, making purification treatments of waters unnecessary and greatly reducing the economical engagement.

1990 - Le bentoniti e la plasticità degli impasti ceramici [Articolo su rivista]
L., Boscardin; Manfredini, Tiziano; G. F., Marzola; C., Pasquali; Pellacani, Gian Carlo; Pozzi, Paolo
abstract

Vengono riportati i risultati relativi ad uno studio sull'effetto dell'aggiunta di bentoniti sulla plasticità degli impasti ceramici

1990 - Monomeric and oligomeric phosphates as deflocculants of concentrated aqueous clay suspensions [Articolo su rivista]
Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, P.; Bonamartini Corradi, A.
abstract

The paper discusses on effects of monomeric and oligomeric phosphates as deflocculants of concentrated aqueous clay suspensions

1990 - New experimental method for ceramic powder compaction control [Articolo su rivista]
J. L., Amoros Albaro; A., Blasco Fuentes; J. E., Enrique Navarro; F., Negre Medall; Manfredini, Tiziano; Pozzi, Paolo
abstract

The paper regards some consideration on a new experimental method for ceramic powder compaction control

1989 - Nuove metodologie di controllo del processo ceramico. L'Importanza delle caratteristiche delle polveri ceramiche da sottoporre a pressatura [Articolo su rivista]
Amoros Albaro, J. L.; Blasco Fuentes, A.; Enrique Navarro, J. E.; Negre Medall, F.; Manfredini, Tiziano; Pozzi, P.
abstract

L'articolo tratta sulle nuove metodologie di controllo del processo ceramico e l'Importanza delle caratteristiche delle polveri ceramiche da sottoporre a pressatura.

1989 - Some general consideration on the rheological behaviour of aqueous clay suspensions: dependence on the physico-chemical properties of inorganic salts, calcium(II)ion presence and grinding times [Articolo su rivista]
Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, Paolo; A., Blasco Fuentes; F., Negre Medall
abstract

The paper reports some general consideration on the rheological behaviour of aqueous clay suspensions: dependence on the physico-chemical properties of inorganic salts, calcium(II)ion presence and grinding times

1988 - Alcune considerazioni generali sul comportamento reologico di sospensioni acquose di argille in funzione delle proprietà chimico-fisiche di deflocculanti inorganici, della presenza di Ioni calcio(II) e dei tempi di macinazione [Articolo su rivista]
Manfredini, Tiziano; Pellacani, Gian Carlo; Pozzi, Paolo; A. Blasco Fuentes e. F., Negre Medall
abstract

L'articolo riporta alcune considerazioni generali sul comportamento reologico di sospensioni acquose di argille in funzione delle proprietà chimico-fisiche di deflocculanti inorganici, della presenza di Ioni calcio(II) e dei tempi di macinazione

1988 - New Procedures for Ceramic Process Control. The Importance of the Characteristics of the Ceramic Powders to be Pressed. [Articolo su rivista]
Amoros Albaro, J. L.; Blasco Fuentes, A.; Enrique navaroo, J. E.; Negre Medall F., '; Manfredini, T.; Pozzi, P.
abstract

Analysis of the most common defects in ceramic products shows that they are directly attributable to the powder types and properties, to the dried porosity of the ceramic products and to possible changes of these characteristics within the products themselves. Among the methods of preparing ceramic products, pressing is the one most widely used. To optimize the entire powder compaction process, a complete knowledge of the powder types and characteristics and the parameters of the die filling is very important. Within the framework of a systematic investigation with the aim of characterizing new experimental methods for ceramic process control, the authors have studied the powder fluidity as a function of powder type, grain size and humidity by means of a new apparatus developed by the authors which enables a rapid check on the powder die filling.

1987 - Na-Silicates as Deflocculating Agents for Clays [Articolo su rivista]
Manfredini, T.; Pellacani, G. C.; Pozzi, P.
abstract

In this paper the rheological behavior of clay aqueous suspensions added with various commercial sodium silicates is investigated, in order to evaluate their utilization as deflocculating agents in practical industrial applications. In the sample preparations the industrial experimental conditions have been reproduced as nearly as possible. The best deflocculating conditions of the studied clays were obtained by using a sodium silicate compound having a SiO//2/Na//2O molar ratio of 2/1. This may be explained, since this silicate is the most effective as pH corrector, as deflocculant cation sequestering agent and as colloidal protector.

1987 - New Experimental Method Measuring Apparent Density of Ceramic Tiles: Technical and Applicational Aspects [Articolo su rivista]
Amoros Albaro, J.; Blasco Fuentes, A.; Manfredini, T.; Pozzi, P.
abstract

Analysis of the most common defects associated with the manufacture of ceramic tiles for floor and wall covering has shown that the said defects can be directly correlated to the porosity of the tiles before firing, to the fluctuaton of this porosity during the manufacturing process and to its nonhomogeneous distribution within the tiles. Various difficulties can be encountered in direct measurements of porosity, thus, for a rapid and reproducible check on the variable of condensation of ceramic tiles, it is more convenient to measure apparent density, which is directly linked to porosity.

1987 - Sodium silicates as deflocculating agents for clays [Articolo su rivista]
Manfredini, Tiziano; G. C., Pellacani; Pozzi, Paolo
abstract

Rheology of clays suspensions are discussed

1987 - Una nuova metodologia sperimentale per la misura della densità apparente dei pezzi ceramici. Aspetti tecnici ed applicativi [Articolo su rivista]
Amoros Albaro, J. L.; Blasco Fuentes, A.; Manfredini, Tiziano; Pozzi, P.
abstract

The paper regards a new technique for apparent density measurement