Study on correlation between exothermic risk of coal gangue and microscopic groups
WANG Zhenxing
WANG Yang
HAN Dongyang
REN Xiaowei
Abstract：In order to explore the exothermic hazard of coal gangue in the process of spontaneous combustion and its correlation with microscopic groups,the microstructure and exothermic characteristics of four kinds of coal gangue(CG1、CG2、CG3、CG4)were tested by infrared spectrum experiment and differential scanning calorimetry experiment;based on the exothermic heat and activa-tion energy,the spontaneous combustion risk coefficient of coal gangue is established,and the correlation between spontaneous com-bustion risk coefficient and the microscopic groups is determined.The results show that the four kinds of coal gangue all contain sub-stituted benzene,‒C=C‒,Ar‒CH,‒CH3,‒CH2‒,Al‒CH,‒OH,‒C‒O‒,‒C=O and inorganic compound groups,but the con-tent of each group is significantly different.The exothermic process of self‒ignition of coal gangue can be divided into three stages:water evaporation,slow exotherm and combustion,but the duration of the three stages is different for different coal gangue.The activation energy of the four kinds of coal gangue in the endothermic stage is CG1>CG3>CG2>CG4,while that of the coal gangue in the exo-thermic stage is CG3>CG4>CG2>CG1.The spontaneous combustion risk coefficients of the four kinds of coal gangue are in the order of CG1>CG2>CG4>CG3,and the correlation between microscopic groups and benzene is in the order of ‒C‒O‒>substituted benzene>‒OH>‒CH3>‒C=C‒>inorganic matter>‒CH2‒>Ar‒CH>‒C=O>Al‒CH>‒COO‒,the correlation of the first three is greater than 0.85.Therefore,coal gangue with higher levels of ‒C‒O‒,substituted benzene and‒OH has a greater risk of spontaneous combustion.
Keywords：coal ganguerisk of spontaneous combustioninfrared spectroscopyheat flow curveactivation energy
Publication Date：2024-02-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 107-115 )