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Thermal decomposition of selected coal gangue

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Abstract

The thermal behavior of two mineral-type coal gangues under different temperature conditions was investigated by heating treatment of kaolinite-type coal gangue and illite-type coal gangue based on thermal analysis, X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). Thermogravimetric, differential thermogravimetric and differential scanning calorimetry results show the thermal decomposition process of kaolinite-type coal gangue and illite-type coal gangue can be divided into three stages, thermal decomposition of kaolinite and illite clay minerals occurred in the first stage and the third stage, and thermal decomposition of carbon material in coal gangue samples occurred in the second stage. Compared with illite-type coal gangue, the volatile of kaolinite-type coal gangue is released more intensely and pyrolysis performance of kaolinite-type coal gangue was better; initial temperature of heat decomposition was lower. The XRD, IR and SEM results showed the mineral phase transformation of kaolinite-type coal gangue occurred at 500 °C, the microscopic kaolinite changed obviously and its flake and layered structure started to break, and the phase of kaolinite transformed into amorphous glassy state, which was metakaolinite. In contrast, the mineral phase transformation of illite-type coal gangue occurred at 900 °C. According to the results of various research methods, it is considered that the thermal stability of kaolinite-type coal gangue is lower than that of illite-type coal gangue. This study has some theoretical significance for the rational use of coal gangue to produce highly activity powder materials.

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Acknowledgements

We thank the Key Laboratory of Resource Survey and Research of Hebei Province. We are also grateful to the anonymous reviewers and the journal editors. This work is supported by the Nature Science Foundation of China (No. 41675150) and the Nature Science Foundation of Hebei Province, China (No. D2017402150).

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Authors and Affiliations

  1. School of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing, 100083, China

    Bohui Xu, Qinfu Liu & Bo Ai

  2. Key Laboratory of Resource Survey and Research of Hebei Province, Hebei University of Engineering, Handan, 056038, Hebei, China

    Bohui Xu & Shuli Ding

  3. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, QLD, 4001, Australia

    Ray L. Frost

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  1. Bohui Xu
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  2. Qinfu Liu
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Correspondence to Ray L. Frost.

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Xu, B., Liu, Q., Ai, B. et al. Thermal decomposition of selected coal gangue. J Therm Anal Calorim 131, 1413–1422 (2018). https://doi.org/10.1007/s10973-017-6687-4

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  • DOI: https://doi.org/10.1007/s10973-017-6687-4

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