Porous glass-ceramics made from microwave vitrified municipal solid waste incinerator bottom ash

Flesoura, Georgia; Monich, Patrícia Rabelo; Alarcón, Roberto Murillo; Desideri, Daniele; Bernardo, Enrico; Zhang, Fei; Pontikes, Yiannis

doi:10.1016/j.conbuildmat.2020.121452

Cited by 15 publications

(3 citation statements)

References 31 publications

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“…The next group of studies within NEW-MINE dealt with the further benefication of vitrified MSWI bottom ashes. In one study, the vitrified bottom ash was subjected to alkali activation (1 M NaOH and 2.5 M NaOH and sinter crystallization (800 • C or 900 • C), thereby yielding porous (70 vol%) glass ceramics with a compressive strength of 3 MPa, which might be used as an alternative to lightweight concrete [115]. Another group of studies addressed the production of inorganic polymers by alkali activation.…”

Section: Alkali Activationmentioning

confidence: 99%

The EU Training Network for Resource Recovery through Enhanced Landfill Mining—A Review

2021

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The “European Union Training Network for Resource Recovery Through Enhanced Landfill Mining (NEW-MINE)” was a European research project conducted between 2016 and 2020 to investigate the exploration of and resource recovery from landfills as well as the processing of the excavated waste and the valorization of the obtained waste fractions using thermochemical processes. This project yielded more than 40 publications ranging from geophysics via mechanical process engineering to ceramics, which have not yet been discussed coherently in a review publication. This article summarizes and links the NEW-MINE publications and discusses their practical applicability in waste management systems. Within the NEW-MINE project in a first step concentrates of specific materials (e.g., metals, combustibles, inert materials) were produced which might be used as secondary raw materials. In a second step, recycled products (e.g., inorganic polymers, functional glass-ceramics) were produced from these concentrates at the lab scale. However, even if secondary raw materials or recycled products could be produced at a large scale, it remains unclear if they can compete with primary raw materials or products from primary raw materials. Given the ambitions of transition towards a more circular economy, economic incentives are required to make secondary raw materials or recycled products from enhanced landfill mining (ELFM) competitive in the market.

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Section: Alkali Activationmentioning

confidence: 99%

The EU Training Network for Resource Recovery through Enhanced Landfill Mining—A Review

2021

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“…Porous glass-ceramics is a new kind of material which distributes a large number of microcrystalline phases and pores evenly in glass phase based on glass-ceramics. Porous glass-ceramics has been widely used as insulation materials for energy-saving building walls and thermal pipelines due to its large specific surface area, better thermal stability, lower thermal conductivity and higher mechanical strength ( Flesoura et al, 2021 ; Yio et al, 2021 ). At present, the preparation methods of porous glass-ceramics mainly include crystallization-acid leaching ( Wang et al, 2003a ; Wang et al, 2003b ; Chen et al, 2020 ), melting sintering with pore-making agent ( Ding, et al, 2015 ; Jiang et al, 2017 ), direct sintering with pore-making agent ( Bernardo and Albertini, 2006 ; Chen et al, 2016 ; Hisham et al, 2020 ; Yio et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Effect of Borax On Sintering Kinetics, Microstructure and Mechanical Properties of Porous Glass-Ceramics From Coal Fly Ash by Direct Overfiring

2022

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The direct sintering process of coal fly ash for the preparation of glass-ceramics is the liquid-phase sintering process, from non-densification to densification. When the temperature exceeds the densification temperature point, the porosity of glass-ceramics on the contrary increases and the pore diameter increases. This provides a basis to prepare porous glass-ceramics by direct overfiring. Adding borax to coal fly ash can reduce the temperature of liquid phase formation, reduce the preparing temperature of porous glass-ceramics, achieve the purpose of energy saving. The effects of borax on the structure, properties and sintering kinetics of porous glass-ceramics prepared from coal fly ash by overfiring were investigated. It is found that the introduction of B-O bond can change the network structure of non-crystalline vitreous in coal fly ash, reduce the melting temperature, promote the formation of liquid phase, and thus increase the porosity of porous glass-ceramics. This paper provides a certain experimental basis for the preparation of porous glass-ceramics by direct overfiring of coal fly ash at low temperature without adding pore-forming agent, and provides a new possibility for the high-value resource utilization of coal fly ash.

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“…Recent studies have evaluated a range of industrial waste based glass-ceramics for technical applications [16][17][18][19][20], including highly porous materials for thermal insulation, and glass-ceramics from coal fly ash, steel slag, and vitrified municipal solid waste incinerator bottom ash with different crystalline phases, including diopside, anorthite, augite, gehlenite, and enstatite.…”

Section: Introductionmentioning

confidence: 99%

Glass-Ceramic Materials Obtained by Sintering of Vitreous Powders from Industrial Waste: Production and Properties

Valderrama

Cuaspud

Taniolo

et al. 2021

Construction Materials

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Glass-ceramics are advanced inorganic silicate materials that can be obtained by sintering glass powders using a careful temperature control to result in the densification, nucleation, and crystallization of the material. In the current work, three different samples were obtained starting from amorphous silicate materials derived from mixtures of metallurgical slag, coal fly ash, and glass cullet, mixed in different proportions. The as-received waste samples were heat-treated to high temperatures to achieve complete melting at 1200, 1300, and 1400 °C for two hours, performing a rapid cooling in order to yield an amorphous material (glass). The obtained frit was ball-milled to a powder, which was then cold pressed to obtain compact pellets. The thermal treatment of pellets was carried out at 800–1100 °C for 2 h followed by a cooling rate of 10 °C/min to obtain the final glass-ceramics. The microstructure of samples was evaluated with scanning electron microscopy (SEM), which showed heterogeneous conglomerates and clusters of ~20 microns. The formation of crystalline phases was corroborated by means of X-ray diffraction (XRD) analysis, showing the presence of anorthite in all samples. Depending on the sample composition, other crystalline phases such as augite, enstatite, and diopside were detected. Using the Debye–Scherrer equation, it was possible to find the average size of the nano-crystalline domains. The quantification of the non-crystalline or amorphous fraction was also performed. Additionally, the density and porosity of the materials were calculated using the procedures defined in the ASTM C373 and ASTM C20 standards, measuring density values in the range 2.2–3.1 g·cm−3. The apparent porosity was approx. 33% in the three materials. Raman spectroscopy analysis showed characteristic signals associated with crystalline phases containing alumina, silica, iron, and calcium. Overall, the study confirmed the possibility of obtaining glass-ceramics with fine (nanometric) crystal sizes from a combination of silicate waste and the capability of modifying the crystalline composition by changing the proportions of the different wastes in the initial formulations.

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Porous glass-ceramics made from microwave vitrified municipal solid waste incinerator bottom ash

Cited by 15 publications

References 31 publications

The EU Training Network for Resource Recovery through Enhanced Landfill Mining—A Review

The EU Training Network for Resource Recovery through Enhanced Landfill Mining—A Review

Effect of Borax On Sintering Kinetics, Microstructure and Mechanical Properties of Porous Glass-Ceramics From Coal Fly Ash by Direct Overfiring

Glass-Ceramic Materials Obtained by Sintering of Vitreous Powders from Industrial Waste: Production and Properties

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