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Experimental Study on the Characteristics of Activated Coal Gangue and Coal Gangue-Based Geopolymer

Author

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  • Weiqing Zhang

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
    School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Chaowei Dong

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
    School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Peng Huang

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of the Ministry of Education for Deep Coal Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Qiang Sun

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of the Ministry of Education for Deep Coal Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Meng Li

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
    School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Jun Chai

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
    School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Coal gangue-based geopolymer (CGGP) is one of the hot spots existing in the recycling of coal gangue resources due to its good comprehensive mechanical properties. However, the coal gangue structure is stable and reactivity is poor, so the coal gangue needs to be activated before utilization. In this paper, the microstructure changes of activated coal gangue by different mechanical and thermal activation methods, as well as the mechanical properties and microstructure changes of the CGGP specimens were studied by experimental investigation. The results indicated that mechanical activation and thermal activation were two effective methods to change the reactivity of coal gangue, which consisted of destroying the stable kaolinite structure and improving the activity of coal gangue. Conversely, part of the amorphous structure in coal gangue was destroyed when the activation temperature reached 900 °C, which was not conducive to the further enhancement of coal gangue activity. For the CGGP prepared by thermally activated coal gangue and modified sodium silicate alkali solution, the uniaxial compressive strength of the CGGP specimens decreased with thermal activation temperatures of the raw coal gangue materials at 700 °C, 800 °C, and 900 °C. The main reason for this was the lower amount of the active metakaolin structure in coal gangue at 900 °C, which was not conducive to the geopolymerization process.

Suggested Citation

  • Weiqing Zhang & Chaowei Dong & Peng Huang & Qiang Sun & Meng Li & Jun Chai, 2020. "Experimental Study on the Characteristics of Activated Coal Gangue and Coal Gangue-Based Geopolymer," Energies, MDPI, vol. 13(10), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:10:p:2504-:d:358848
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    References listed on IDEAS

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    1. Liang Song & Shanjun Liu & Wenwen Li, 2019. "Quantitative Inversion of Fixed Carbon Content in Coal Gangue by Thermal Infrared Spectral Data," Energies, MDPI, vol. 12(9), pages 1-17, May.
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