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Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Coal gangue is a solid waste with low carbon content discharged during the course of the coal mining process. The resource utilization of coal gangue could solve environmental problems caused by its excessive production, such as soil contamination and land occupation. This study proposed to produce...

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Autores principales: Zheng, Yangfan, Cui, Jiayan, Gao, Pengxiao, Lv, Junfan, Chi, Lin, Nan, Hongyan, Huang, Yuandong, Yang, Fan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10672682/
https://www.ncbi.nlm.nih.gov/pubmed/38005122
http://dx.doi.org/10.3390/ma16227193
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author Zheng, Yangfan
Cui, Jiayan
Gao, Pengxiao
Lv, Junfan
Chi, Lin
Nan, Hongyan
Huang, Yuandong
Yang, Fan
author_facet Zheng, Yangfan
Cui, Jiayan
Gao, Pengxiao
Lv, Junfan
Chi, Lin
Nan, Hongyan
Huang, Yuandong
Yang, Fan
author_sort Zheng, Yangfan
collection PubMed
description Coal gangue is a solid waste with low carbon content discharged during the course of the coal mining process. The resource utilization of coal gangue could solve environmental problems caused by its excessive production, such as soil contamination and land occupation. This study proposed to produce high-strength thermal insulation bricks using coal gangue as the primary material and three other mineral powders as auxiliary materials, including K-feldspar, CaCO(3) and fly ash. A systematic analysis was conducted to explore the optimum raw material addition ratio and optimum sintering temperature; then, the intrinsic structure of thermal insulation bricks and their sintering formation mechanisms were revealed. The results showed that the optimal ratios of coal gangue, K-feldspar, CaCO(3) and fly ash were 65 wt%, 15 wt%, 10 wt% and 10 wt%, respectively; the compressive strength of the thermal insulation brick produced under this ratio was 22.5 MPa; thermal conductivity was 0.39 W m(−1) k(−1). During sintering processes, mineral powders sufficiently fused to form a skeleton, and the CO(2) derived from CaCO(3) formed pores. The optimum sintering temperature was 1150 °C, because at this temperature, K-feldspar had the best effect in promoting the conversion of CaCO(3) to Ca-feldspar. The high level of the relative crystallinity of Ca-feldspar (about 76.0%) helped raise the Si–O network’s polymerization degree (NBO/T = 1.24), finally raising the compressive strength of thermal insulation bricks. The innovative method of using coal gangue to make thermal insulation bricks not only solved the environmental pollution caused by coal gangue but also provided excellent construction materials with high practical application value.
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spelling pubmed-106726822023-11-16 Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks Zheng, Yangfan Cui, Jiayan Gao, Pengxiao Lv, Junfan Chi, Lin Nan, Hongyan Huang, Yuandong Yang, Fan Materials (Basel) Article Coal gangue is a solid waste with low carbon content discharged during the course of the coal mining process. The resource utilization of coal gangue could solve environmental problems caused by its excessive production, such as soil contamination and land occupation. This study proposed to produce high-strength thermal insulation bricks using coal gangue as the primary material and three other mineral powders as auxiliary materials, including K-feldspar, CaCO(3) and fly ash. A systematic analysis was conducted to explore the optimum raw material addition ratio and optimum sintering temperature; then, the intrinsic structure of thermal insulation bricks and their sintering formation mechanisms were revealed. The results showed that the optimal ratios of coal gangue, K-feldspar, CaCO(3) and fly ash were 65 wt%, 15 wt%, 10 wt% and 10 wt%, respectively; the compressive strength of the thermal insulation brick produced under this ratio was 22.5 MPa; thermal conductivity was 0.39 W m(−1) k(−1). During sintering processes, mineral powders sufficiently fused to form a skeleton, and the CO(2) derived from CaCO(3) formed pores. The optimum sintering temperature was 1150 °C, because at this temperature, K-feldspar had the best effect in promoting the conversion of CaCO(3) to Ca-feldspar. The high level of the relative crystallinity of Ca-feldspar (about 76.0%) helped raise the Si–O network’s polymerization degree (NBO/T = 1.24), finally raising the compressive strength of thermal insulation bricks. The innovative method of using coal gangue to make thermal insulation bricks not only solved the environmental pollution caused by coal gangue but also provided excellent construction materials with high practical application value. MDPI 2023-11-16 /pmc/articles/PMC10672682/ /pubmed/38005122 http://dx.doi.org/10.3390/ma16227193 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zheng, Yangfan
Cui, Jiayan
Gao, Pengxiao
Lv, Junfan
Chi, Lin
Nan, Hongyan
Huang, Yuandong
Yang, Fan
Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks
title Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks
title_full Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks
title_fullStr Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks
title_full_unstemmed Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks
title_short Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks
title_sort newly generated ca-feldspar during sintering processes enhances the mechanical strength of coal gangue-based insulation bricks
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10672682/
https://www.ncbi.nlm.nih.gov/pubmed/38005122
http://dx.doi.org/10.3390/ma16227193
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