To reduce the pressure on underlying coal seam and maximize the mining efficiency of coal resource, narrow coal pillar mining technology is often used. However, for coal mines with high gas and spontaneous combustion, this technology can cause gas and coal spontaneous combustion composite disaster easily. In this paper, we adopted a new type of inorganic fire‐extinguishing material (IFEM) to prevent and control gas and coal spontaneous combustion composite disaster. The result shows that the destruction of narrow pillar caused by stress extrusion and mining disturbance is the internal cause of gas and coal spontaneous combustion composite disaster. IFEM can go deep into the cracks of coal mass to seal up the cracks and reduce gas exchange between roadway and adjacent goaf. Meanwhile, it is full of moisture in the interior, which can reduce the temperature of coal mass through evaporation and heat absorption. The IFEM has the characteristics of high water retention, strong fluidity, and strong flame retardant, which can inhibit the generation of free radicals in coal mass at both physical and chemical levels, prevent the spontaneous combustion of coal mass, and reduce the occurrence of composite disasters of gas and coal spontaneous combustion.

中文翻译：

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防治窄煤柱及邻近采空区瓦斯和煤自燃的无机灭火材料的研究

为了减轻对下层煤层的压力并最大化煤炭资源的开采效率，经常使用窄煤柱开采技术。但是，对于高瓦斯自燃的煤矿，该技术容易造成瓦斯和煤自燃的复合灾害。在本文中，我们采用了一种新型的无机灭火材料（IFEM）来预防和控制瓦斯和煤的自燃复合灾害。结果表明，应力挤压和开采扰动引起的窄柱破坏是瓦斯和煤自燃复合灾害的内在原因。IFEM可以深入煤层的裂缝以封闭裂缝并减少巷道与相邻采空区之间的气体交换。同时，内部充满了水分，通过蒸发和吸收热量可以降低煤料的温度。IFEM具有高保水性，强流动性和强阻燃性的特点，可以在物理和化学水平上抑制煤团中自由基的产生，防止煤团的自燃，并减少复合物的发生。天然气和煤炭自燃的灾难。