Reutilization and stabilization of wastes by the production of glass foams

Bernardo, Enrico; Cedro, R.; Florean, M.; Hreglich, Sandro

doi:10.1016/j.ceramint.2006.02.010

Cited by 151 publications

(104 citation statements)

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“…The distribution and amount of pores determine specific properties, such as low density and thermal conductivity, high surface area, permeability and chemical and thermal stability 1,4,5 . Furthermore, glass foams have mechanical strength and chemical and thermal stabilities greater than the polymeric foams typically employed in such cases 1,6,7 . Several techniques or methods for producing porous ceramics are used and the process steps generally consist in preparing a suspension of a ceramic powder, forming and heat treatment (firing).…”

Section: Introductionmentioning

confidence: 99%

“…The recycling and the use of glass can contributes to the national energy matrix through the large amount of energy savings since to produce 1 kg of new glass 4500 kJ are needed, while to produce 1 kg of recycled glass 500 kJ only are needed 12,13 . In order to reduce production costs and get raw materials, several modifications have been applied to the processing techniques and starting materials 6 . In addition, glass foams represent an interesting destination for glass wastes and vegetables from an economic and environmental point of view.…”

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confidence: 99%

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Thermal Insulating Foams Produced From Glass Waste and Banana Leaves

et al. 2016

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In this work, compositions containing transparent glass bottles and banana leaves (desiccated and crushed), with different mass fractions (30-50%), were prepared for obtaining cellular materials for thermal insulation purposes. The formulated and prepared compositions were uniaxially pressed (10 MPa) and the compact powders fired between 700 and 850°C for 30 min in order to investigate the effect of the banana leaves on the formation of pores and on the thermal and mechanical properties of the processed glass foams. The results indicated that the obtained glass foams with porosities between 58.5 and 87.5%, compressive strength ranging between 1.17 and 3.50 MPa and thermal conductivity ranging between 0.06 and 0.15 W/mK, are potential candidates to work as thermal insulators with appropriate properties for a specific application.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Thermal Insulating Foams Produced From Glass Waste and Banana Leaves

et al. 2016

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“…Thus far, many studies have been carried out on CRT glass treatments [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. In previous years, CRT glass was generally cleaned, sorted and sent to glass manufacturers for new CRT glass manufacturing.…”

Section: Introductionmentioning

confidence: 99%

“…In previous years, CRT glass was generally cleaned, sorted and sent to glass manufacturers for new CRT glass manufacturing. Currently, due to the extreme reduction in CRT production, much attention had been attracted to the recycle of CRT glass as a secondary raw material, such as reutilization as glaze [4,5], glass ceramic [6], foam glass [7][8][9][10][11][12] and glass matrix composites [13][14][15][16]. Nevertheless, these methods paid little attention to the environmental security, since the prepared products still contain dangerous heavy metals, which should be removed or separated.…”

Section: Introductionmentioning

confidence: 99%

Effective utilization of waste cathode ray tube glass—Crystalline silicotitanate synthesis

Chen

Zhang

Zhu

2010

Journal of Hazardous Materials

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a b s t r a c tA novel process for crystalline silicotitanate (CST) synthesis was developed using waste cathode ray tube (CRT) panel glass as silicon source. The key trait of the process was to extract most of the silicon out of the glass for CST preparation, but leave Ba and Sr in the residue which had the potential to be employed as raw material for metallic Ba and Sr metallurgy. In the synthesis process, waste CRT panel glass was firstly treated by supercritical water (SCW)-NaOH solution for Si extraction, then sol-gel and hydrothermal treatments were used for CST preparation. 80% of Si in the glass could be extracted into the solution, while Sr and Ba were enriched in the residue in the form of Sr 2 SiO 4 and Ba 2 Si 3 O 8 , respectively. Sr and Ba contents in the residue were 2-3 times higher than those in the raw glass. SEM, XRD and TEM results indicated that CST was successfully synthesized. Ion exchanging experiments showed that the batch distribution coefficient of the synthesized CST to Cs + was up to 1.2 × 10 4 mL/g at pH 0.26.

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“…[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.…”

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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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Reutilization and stabilization of wastes by the production of glass foams

Cited by 151 publications

References 6 publications

Thermal Insulating Foams Produced From Glass Waste and Banana Leaves

Thermal Insulating Foams Produced From Glass Waste and Banana Leaves

Effective utilization of waste cathode ray tube glass—Crystalline silicotitanate synthesis

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

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