Recycling of waste glasses into partially crystallized glass foams

Bernardo, Enrico; Scarinci, G.; Bertuzzi, Paolo; Ercole, P.; Ramon, Ludovico

doi:10.1007/s10934-009-9286-3

Cited by 84 publications

(41 citation statements)

References 15 publications

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“…Various types of glass powders and blowing agents were previously investigated for the processing of foam glass. The glass particles polishing wastes containing SiC particles were used as blowing agent for foaming soda-lime glass powder [5] and the powder mixture of soda-lime glass and glass fiber [6]. The glass cullet mixed with 20 wt% fly ash was foamed using marble polishing plant sludge (mainly composing of calcite and dolomite) and using SiC as blowing agent [7].…”

Section: Introductionmentioning

confidence: 99%

Foam glass processing using a polishing glass powder residue

Attila

Güden

Taşdemirci

2013

Ceramics International

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The foaming behavior of a powder residue/waste of a soda-lime window glass polishing facility was investigated at the temperatures between 700 and 950 1C. The results showed that the foaming of the glass powder started at a characteristic temperature between 670 and 680 1C. The maximum volume expansions of the glass powder and the density of the foams varied between 600% and 750% and 0.206 and 0.378 g cm À 3 , respectively. The expansion of the studied glass powder residue resulted from the decomposition of the organic compounds on the surfaces of the glass powder particles, derived from an oil-based coolant used in the polishing. The collapse stress of the foams ranged between $ 1 and 4 MPa and the thermal conductivity between 0.048 and 0.079. Both the collapse stress and thermal conductivity increased with increasing the foam density. The foams showed the characteristics of the compression deformation of the open cell brittle foams, which was attributed to the relatively thick cell edges.

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Section: Introductionmentioning

confidence: 99%

Foam glass processing using a polishing glass powder residue

Attila

Güden

Taşdemirci

2013

Ceramics International

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“…The increase in temperature will accelerate the burning out of the residual carbon present in fly ash, promoting gas release, and therefore there is a significant increase in porosity. Considering the TG results mentioned above for fly ash, most of the oxidation of the residual carbon had already taken place at 800°C, and increasing the treatment time at this temperature can lead to a porosity decrease (density increase) due to the beginning of the coalescence of small pores into larger ones [13]. The coalescence is favoured by the reduction of surface energy, and the dissolution of small pores into larger ones is generally associated to the thickening of the pore walls [13].…”

Section: Porosity Apparent Density and Microstructural Characterizationmentioning

confidence: 99%

“…Considering the TG results mentioned above for fly ash, most of the oxidation of the residual carbon had already taken place at 800°C, and increasing the treatment time at this temperature can lead to a porosity decrease (density increase) due to the beginning of the coalescence of small pores into larger ones [13]. The coalescence is favoured by the reduction of surface energy, and the dissolution of small pores into larger ones is generally associated to the thickening of the pore walls [13]. Figure 3 illustrates the microstructural changes associated to the CRT glass foams obtained at different heattreatment temperatures.…”

Section: Porosity Apparent Density and Microstructural Characterizationmentioning

confidence: 99%

“…Waste glass powders have been converted into foams by an oxidation process of carbon-based foaming agents (e.g. SiC) or by decomposition of minerals such as CaCO 3 , Na 2 CO 3 , MgCO 3 and CaSO 4 [10][11][12][13]. Previous studies on the processing of CRT foams, where carbonates were used as foaming agents, egg shell (CaCO 3 ) [14] and soda ash (Na 2 CO 3 ) [8], showed that the foams densities are dependent on the foaming agent concentration and highly dependent on heat treatment temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effect of processing conditions on the properties of recycled cathode ray tube glass foams

et al. 2016

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Cathode ray tube glass waste was used to produce glass foams by a powder sintering route. The glass waste powder was mixed with small amounts (5 and 8 wt%) of coal fly ash, which acted as foaming agent, and the compacts of the mixed powders were heated at different sintering temperatures in the range 600-800°C for various dwell times (30-120 min). The effect of the different processing conditions on the microstructural characteristics (porosity, pore size and pore size distribution), mechanical resistance and thermal conductivity of the produced foams was investigated. The volume of pores tended to increase with sintering temperature and time, and glass foams (with a porosity higher than 50 %) were only achieved after sintering at 750°C. The average pore size increased with sintering temperature and dwell time, and pore growth was particularly accentuated at 800°C, where coalescence of the pores occurred, with a consequent decrease in compressive strength. Selected combinations of the sintering temperature, dwell time and foaming agent led to glass foams with a satisfactory microstructural homogeneity, which exhibited mechanical strength and thermal conductivity values similar to commercial foams used as thermal insulating materials.

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“…Diverse waste materials based on Si, Al, Ti, and C have been evaluated to elaborate a cellular or foamy ceramics: slag and fly ash [1] wastes from petrochemical fields, [2] cathode ray tubes, [3] waste glasses, [4] and porcelain tile powder [5] are examples. In the first reference, combustion gases dissolved in the slag are responsible for foaming [1] ; in the second case, ceramic cenospheres were added to generate porosity.…”

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confidence: 99%

Optimization of a Cellular Glass Ceramic Produced from Water Potabilization Sludge for Structural and Chemical Applications

et al. 2017

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Waste sludge generated in the potabilization of surface water is used to produce cellular materials by mixing with clay and firing at 1 250C. An iron-rich glassy matrix with crystals of mullite and albite is formed. Porosity is generated by the slow release of H 2 O, which originates from the dehydroxilation of lepidocrocite at high temperature. The sludge/clay ratio and the sludge granulometry determine the properties of the product: from highly porous cellular foams to denser materials with high strength. Laboratory tests for both kinds of products show that the latter can be used as aggregates for lowdensity structural concrete. The former serve as a support material for the catalytic reduction of NO x in exhaust gases. Deposition conditions for Fe-and Pt-nanoparticles are optimized by experimental design, resulting in NO x -conversion rates close to 100%.The valorization of wastes as a prime material to produce a ceramic with interesting technological properties is an option to decrease product costs and represents an environmentally friendly alternative to waste disposal. Diverse waste materials based on Si, Al, Ti, and C have been evaluated to elaborate a cellular or foamy ceramics: slag and fly ash [1] wastes from petrochemical fields, [2] cathode ray tubes, [3] waste glasses, [4] and porcelain tile powder [5] are examples. In the first reference, combustion gases dissolved in the slag are responsible for foaming [1] ; in the second case, ceramic cenospheres were added to generate porosity.[2] The other three studies use small amounts of SiC to achieve the formation of ceramic foams, while Bernardo et al. used waste SiC from polishing operations to produce a glass foam.[6]Release of O 2 by the reduction of Fe 2 O 3 was responsible for foaming in products obtained from waste glass and metallurgical slag, without the need for additional foaming agents.[7]Previous work on the valorization of the sludge produced in water potabilization [8,9] showed that mixing with various amounts of clay and firing in the two-phase temperature range allows producing a cellular ceramic without foaming agents.Mössbauer spectroscopy and thermogravimetric analysis indicate that the slow release of H 2 O by dehydroxylation of ghoethite or lepidocrocite at high temperature is responsible for the foaming of the viscous mixture.[9] A glassy matrix, rich in This communication presents a summary of recent studies, in which the technological applications of this cellular ceramic are explored. High-strength medium-porosity materials was optimized for its use in lightweight structural concrete. This presents a high-volume, low added value application which is optimal, when waste reduction is the main goal.

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Recycling of waste glasses into partially crystallized glass foams

Cited by 84 publications

References 15 publications

Foam glass processing using a polishing glass powder residue

Foam glass processing using a polishing glass powder residue

Effect of processing conditions on the properties of recycled cathode ray tube glass foams

Optimization of a Cellular Glass Ceramic Produced from Water Potabilization Sludge for Structural and Chemical Applications

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