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Risk Assessment of Oxidizability of Coal after Dynamic Hazard and Its Effect on Functional Groups and Radicals

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Abstract

Dynamic hazard and coal spontaneous combustion are major potential safety hazards in coal mines with enriched gas and spontaneously inflammable property. However, the initial oxidizability of coal samples after dynamic hazard has yet to be understood. A simplified device for dynamic hazard simulation of coal-and-gas outburst was established. The physical and chemical changes of coal surface, and their effects on initial oxidation were analyzed. Firstly, loose coal was pressurized by gas step-by-step, and the CO content was enhanced with increase in gas pressure. Meanwhile, the specific surface area provides a hotbed for low-temperature oxidation of radicals and functional groups of coal. Finally, the mechanism of mechanical force on the increase of radical and active groups with the homolysis of covalent bond was discussed. The initial oxidizability of coal after dynamic damage was characterized by oxygen absorption. The physicochemical characteristics suitable for coal oxidation, were formed under the mechano–chemical effect. The findings presented in here add to our understanding of the influence of dynamic hazard on coal oxidation.

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Acknowledgments

This research was supported by the National Key R&D Program of China (2018YFC0807900) and “Double First Rate” Independent Innovation Project of CUMT (2018ZZCX05).

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Authors and Affiliations

  1. Mining College, Guizhou University, Guiyang, 550025, China

    Jiawen Cai

  2. State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Xuzhou, 221116, China

    Shengqiang Yang, Wancheng Zheng & Wanxin Song

  3. Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China

    Shengqiang Yang & Wancheng Zheng

  4. School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Shengqiang Yang & Wancheng Zheng

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  1. Jiawen Cai
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  4. Wanxin Song
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Correspondence to Shengqiang Yang.

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Cai, J., Yang, S., Zheng, W. et al. Risk Assessment of Oxidizability of Coal after Dynamic Hazard and Its Effect on Functional Groups and Radicals. Nat Resour Res 30, 4533–4545 (2021). https://doi.org/10.1007/s11053-021-09941-2

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