Micro- and macro-cellular sintered glass-ceramics from wastes

Bernardo, Enrico

doi:10.1016/j.jeurceramsoc.2006.10.003

Cited by 53 publications

(33 citation statements)

References 21 publications

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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%

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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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Section: Introductionmentioning

confidence: 99%

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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“…Thus far, many studies have been carried out on CRT glass treatments [6][7][8][9][10][11][12][13][14][15][16][17]. As a simple recycling way, CRT glass was generally cleaned, sorted and sent to glass manufacturers for new CRT glass manufacturing.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, Bernardo et al [9][10][11] used CRT glass to prepare dense alumina or alumina oxide platelet-reinforced glass matrix composites by cold-pressing and pressure-less viscous flow sintering technique. Furthermore, CRT glass was recycled as glaze [6], glass ceramic [7] and foam glass [8,[18][19][20][21] individually or mixed with other industry wastes by fine powder sintering treatment. In addition, CRT glass was also used as fluxing agent in the porcelain stoneware tile production and by the lead smelters.…”

Section: Introductionmentioning

confidence: 99%

Detoxification of cathode ray tube glass by self-propagating process

Chen

Zhang

Zhu

2009

Journal of Hazardous Materials

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a b s t r a c tA novel process for the treatment of hazardous waste Cathode Ray Tube (CRT) glass, based on selfpropagating reaction, was proposed. In the process, various types of CRT glass powders were blended with suitable amount of ferric oxide and magnesium, and the mixtures could generate self-propagating reaction once locally ignited by a thermal source. Generally, the self-propagating reaction could be well maintained when the CRT glass content in the mixture was no more than 60 wt.%, and the combustion wave velocity and maximum combustion temperature decreased along with the increase in glass amount. XPS experiments showed that heavy elements in the final products became more stable and were solidified during the process. Leaching tests demonstrated that heavy metals in the final products fulfilled the environmental regulations of USEPA. It is supposed that the detoxified products have the potential of being used as construction materials.

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“…Crystallization, which occurs during sintering of glass particles, is particularly important. Crystallization promotes stabilization of a porous (cellular) structure and during duplication of a polymer matrix it has a favorable effect on retention of pore shape [4].…”

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confidence: 99%

Preparation of highly porous cellular glass materials in the field of pyroxene crystallization

et al. 2011

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The work is devoted to sintering amorphous crystallizing glasses by slip technology with the aim of preparing highly porous cellular materials. Data are presented for the dependence of the intensity of diopside-like phase precipitation on the type of material subjected to crystallization. Attention is devoted to preparing and developing microstructure and physicochemical properties for specimens obtained after heat treatment. The materials developed may be used as substrates for catalysts of various physicochemical processes.Highly porous cellular materials (HPCM) are a new type of material with an extremely high level of porosity, having a permeable cellular structure of the pore space [1].HPCM are used extensively: in the chemical industry (in mass transfer processes, etc.). New filtering materials and catalyst substrates developed on the basis of HPCM are intended for filtering liquids and gases, cleaning gas discharges from aerosols, catalytic burning of harmful discharges from industrial enterprises, and rubbish burning plants [2].HPCM are prepared from different materials, among which are metals and alloys (Fe, Ni, Co, Cu, nickel-chromium alloy), ceramics (based on aluminosilicates, silicon nitride), and composite materials.The first publications in the USA and Great Britain about preparation of highly porous materials by duplicating a polymer matrix relate to the end of the 1950s and the start of the 1960s. In Russia, development of highly porous ceramic materials by this method has been carried out since 1976. However, there is currently little work for preparing highly porous cellular glassy materials and this area is assumed to be little studied. Only in individual publications, for example in [3], is there an understanding about the preparation of HPCM from quartz glass. In an article [4] the possibility is proposed of preparing HPCM from glass scrap of electron beam tubes and picture tubes. In the faculty of glass and sitall chemical technology of the Institute of High-Temperature Materials and Technology HPCM were prepared for the first time on the basis of glass of the aluminoborosilicate system, and glass in the field of crystallization of pyroxenes, and their properties were studied with the aim of revealing new areas of application.Currently the most popular porous materials are based on sitalls. The theoretical basis of synthesizing porous glass ceramic materials is the method of directional solidification of glass of appropriate chemical composition. These materials, after performing a number of production measures, acquire a set of high operating properties.

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Micro- and macro-cellular sintered glass-ceramics from wastes

Cited by 53 publications

References 21 publications

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

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

Detoxification of cathode ray tube glass by self-propagating process

Preparation of highly porous cellular glass materials in the field of pyroxene crystallization

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