Preparation of CaO–Al2O3–SiO2 glass ceramics from coal gangue

For the recycling and exploitation of coal industry wastes, CaO-Al2O3-SiO2 glass ceramics were prepared using up to 70wt.% coal gangue as the main starting materials. The coal wastes were characterized, and the processing schedule, crystal phases, microstructure and properties of the glass ceramics...

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Bibliographic Details
Published in:International journal of mineral processing 2012-01, Vol.102-103, p.112-115
Main Authors: Yang, Mei, Guo, Zhixing, Deng, Yinsheng, Xing, Xueling, Qiu, Kehui, Long, Jianping, Li, Junfeng
Format: Article
Language:English
Subjects:
Coal
Crystal structure
Crystals
Gangue
Glass ceramics
Microstructure
Phases
Wastes
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Summary:For the recycling and exploitation of coal industry wastes, CaO-Al2O3-SiO2 glass ceramics were prepared using up to 70wt.% coal gangue as the main starting materials. The coal wastes were characterized, and the processing schedule, crystal phases, microstructure and properties of the glass ceramics were investigated. The prepared glass ceramics showed dense and homogeneous microstructure with crystal size of about 4 mu m. Crystallization was observed at 1020 degree C, producing crystalline gehlenite (Ca2Al2SiO7) as the major phase and nepheline (NaAlSiO4) as the minor phase. The prepared glass ceramics exhibited attractive physical, mechanical and corrosion resistance properties, showing large application potential for construction purposes.
ISSN:0301-7516
DOI:10.1016/j.minpro.2011.11.004