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Experimental study on the effects of chemical composite additive on the microscopic characteristics of spontaneous combustion coal

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Abstract

In order to study the effects of chemical composite additive (CCA) on the microscopic characteristics of spontaneous combustion coal, atomic force microscope and Fourier transform infrared spectroscopy technology were used to study the microstructure and active groups of spontaneous combustion coal. The roughness, three-dimensional surface morphology, microscopic pore structure, infrared spectrum, and active group content of raw coal samples and coal samples treated with water or different concentrations of CCA were analyzed. The experimental results showed that compared with the raw coal, the roughness Rq and Ra of the CCA-treated coal samples decreased with increasing CCA concentration, and the surface topography of the microscopic structure tended to be flat and smooth, and the size becomes smaller and the depth becomes shallow of pore. In the raw coal samples and coal samples treated with water and CCA, the main types of active groups remained constant. However, the contents of these groups changed, and the order of the contents of main types of active groups is water-treated > raw coal (untreated) > CCA-1% treated > CCA-5% treated > CCA-10% treated > CCA-20% treated. In addition, the mechanism of the CCA inhibition of coal spontaneous combustion was discussed and analyzed.

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Acknowledgments

The authors wish to thank these organizations for their support. They also wish to thank the readers and editors for their constructive comments and suggestions to improve the manuscript.

Funding

This work was carried out with funding from the National Key R&D Program of China (Grant No. 2018YFC0808100) and National Natural Science Foundation of China (Grant No. 51304070, 51674103).

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Authors and Affiliations

  1. Department of Safety & Science Engineering, Henan Polytechnic University, Jiaozuo, 454003, China

    Rongkun Pan, Junwei Ma, Ligang Zheng & Jian Wang

  2. The Collaborative Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo, 454003, China

    Rongkun Pan, Ligang Zheng & Jian Wang

  3. Henan Key Laboratory of Prevention and Cure of Mine Methane & Fires, Jiaozuo, 454003, Henan, China

    Rongkun Pan, Ligang Zheng & Jian Wang

Authors
  1. Rongkun Pan
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  2. Junwei Ma
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  3. Ligang Zheng
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  4. Jian Wang
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Correspondence to Rongkun Pan or Junwei Ma.

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Responsible editor: Philippe Garrigues

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Pan, R., Ma, J., Zheng, L. et al. Experimental study on the effects of chemical composite additive on the microscopic characteristics of spontaneous combustion coal. Environ Sci Pollut Res 27, 5606–5619 (2020). https://doi.org/10.1007/s11356-019-07340-y

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  • DOI: https://doi.org/10.1007/s11356-019-07340-y

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