Activity and structure of calcined coal gangue

Gong, Chenchen; Li, Dongxu; Wang, Xiaojun; Li, Zongjin

doi:10.1007/s11595-006-4749-8

Cited by 18 publications

(11 citation statements)

References 3 publications

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Section: Discussionmentioning

confidence: 99%

“…Previous studies on coal mining waste have demonstrated the potential for its use in alkali-activated material since it is rich in silicon and aluminum (6)(7)(8). However, pre-treatment processes are required (6,9). The aim of this research was to evaluate the influence of three different wastes on the mechanical performance and microstructural development of AAM, since the chemical, physical and mineralogical characteristics play an important role in this regard (44).…”

Section: Discussionmentioning

confidence: 99%

“…The main chemical compounds are SiO 2 and Al 2 O 3 , with traces of Fe, S, Ca and Mn (6)(7)(8). Some aluminosilicates are also present in the mineral phases, with little or no reactivity, and pre-treatment processes can promote more amorphous phase formation and less crystalline products (6,9). These characteristics can enhance the potential for coal gangue to be used in the production of construction materials.…”

Section: Introductionmentioning

confidence: 99%

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Influence of different sources of coal gangue used as aluminosilicate powder on the mechanical properties and microstructure of alkali-activated cement

2019

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Coal mining wastes are associated with serious environmental problems; they have potential as building materials, including alkali-activated cement. In this study, the effect of different coal mining wastes on the mechanical properties and microstructural development of alkali-activated materials (AAMs) was evaluated through XRD, SEM and FTIR spectroscopy. Different alkali-activated compounds were produced; the alkaline solution was composed of NaOH+Na2SiO3. The results obtained using the calcined coal sludge showed excellent mechanical performance, with compressive strength higher than 60 MPa. However, addition of metakaolin and ordinary Portland cement was necessary to increase the mechanical performance of calcined coal gangue materials. The formation of N-A-S-H gel and the incorporation of iron ions into the cementitious matrix were evidenced. Ultrasonic pulse velocity indicated the early polymerization during the reaction processes. The study verified that the different characteristics of the wastes influence the performance of alkali-activated materials.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of different sources of coal gangue used as aluminosilicate powder on the mechanical properties and microstructure of alkali-activated cement

2019

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“…Os resíduos de carvão são materiais heterógenos, suas características físicoquímicas e mineralógicas dependem do tipo de formação geológica presente na região de extração, mas geralmente apresentam minerais de quartzo, caulinita, ilita, pirita, são compostos quimicamente em maiores teores por SiO2 e Al2O3, apresentando teores menores de Fe, S, Ca e Mn (GONG et al, 2007;CAO et al, 2016;CRUTANEO, 2016), portanto os resíduos de mineração de carvão são aluminoso silicatos inseridos em fases minerais, com pouca ou nenhuma reatividade, necessitando de processos de prétratamento para prover maior teor de fases vítreas ou amorfas (GONG et al, 2007).…”

Section: Referencial Teóricounclassified

Estudo da influência da adição de carvão mineral e redução de areia em argamassa de revestimento, em sua resistência à compressão e absorção de água por capilaridade / Study of the influence of addition of mineral coal and reduction of sand in mortar, on its compressive strength and water absorption by capillarity

Matoski¹,

Ochoa²,

Mantovani³

et al. 2022

BJDV

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A responsabilidade pela correta utilização dos recursos naturais e os impactos ambientais causados por suas explorações são temas essenciais na engenharia, principalmente o que compete a correta destinação final dos resíduos. Tendo em vista que o carvão mineral ainda é responsável por parte da geração de energia mundial, e que sua produção, além de ser responsável pela elevada emissão de CO2, gera resíduos ao ambiente, estudos que avaliem alternativas de mitigação do impacto ambiental desse insumo são de grande relevância. Uma das formas de minimizar os impactos ao meio ambiente trazidos pelo insumo gerado seria dar uma correta destinação a ele. O presente estudo teve por objetivo avaliar a influência dos rejeitos da mineração de carvão e redução de areia, para isso, foram elaborados corpos de prova com adição de rejeitos de carvão em 5%, 10%, 15%

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“…Despite the aforementioned possibilities of using coal shale, new and more rational methods and technologies of its management are continually being looked for [9,10]. Due to the poor pozzolanic activity of shale rock, it is necessary to subject it to the thermal processing of calcination [11,12,13,14,15]. During the calcination process of waste coal shale, dehydroxylation of clay minerals, such as kaolin, occurs.…”

Section: Introductionmentioning

confidence: 99%

Calcined Post-Production Waste as Materials Suitable for the Hydrothermal Synthesis of Zeolites

Łach

Grela

Komar³

et al. 2019

Materials

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The zeolite production process is currently being very intensively researched. Due to environmental protection, as well as issues related to the guidelines of a zero-waste economy, all activities aimed at obtaining such materials from post-processed waste are extremely important. This article presents an innovative method of utilising calcined carboniferous shale in order to produce synthetic zeolites. The raw material for testing came from two Polish hard coal mines. Both the chemical and phase composition of the coal shale were characterised. Based on the recorded thermal analysis results coupled with the mass spectrometer, the processes occurring during the heating of raw materials were interpreted and the calcination temperatures were determined. The changes in the phase composition of raw materials resulting from the calcination process used were also analysed. The heat-treated raw materials were subjected to the synthesis of zeolites in an aqueous solution of sodium hydroxide by means of the hydrothermal method at a concentration of 2.75 M. The results of water leaching and structural parameters are presented for both raw materials, as well as the produced synthesis. The conducted research confirmed that after the application of the synthetic process on coal shale, a zeolite with a surface area of SBET equal to 172 m2/g can be obtained.

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Activity and structure of calcined coal gangue

Cited by 18 publications

References 3 publications

Influence of different sources of coal gangue used as aluminosilicate powder on the mechanical properties and microstructure of alkali-activated cement

Influence of different sources of coal gangue used as aluminosilicate powder on the mechanical properties and microstructure of alkali-activated cement

Calcined Post-Production Waste as Materials Suitable for the Hydrothermal Synthesis of Zeolites

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