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为探讨用岩粉防治遗煤自燃的可行性,用理论与试验相结合的方法,研究混有岩粉的遗煤自燃过程。首先,由理论分析可知,岩粉的混入主要对遗煤自燃起阻止作用;将试验分成3组,观测各试验煤样的氧化升温过程。试验结果表明,混入岩粉的量及粒径对遗煤自燃过程有较大影响;当岩粉量大于临界岩粉量时,岩粉的混入能抑制遗煤自燃;当岩煤比达到1∶1及以上时,遗煤基本失去自燃的危险;当混入岩粉粒径大于临界粒径、接近峰值粒径时,混入岩粉对遗煤自燃的防治效率最高。在合理的岩粉量及粒径条件下,用岩粉防治遗煤自燃理论上是可行的。
In order to explore the feasibility of preventing and controlling spontaneous combustion of coal left by rock powder, the spontaneous combustion process of coal left with rock powder was studied by a combination of theory and experiment. First of all, the theoretical analysis shows that the mixing of rock dust mainly plays a role in preventing spontaneous combustion of coal; the experiment is divided into three groups to observe the oxidation and temperature rising process of each test coal sample. The results show that the amount of mixed rock powder and particle size have a significant impact on spontaneous combustion of coal during coal separation. When the amount of rock powder is larger than the critical amount of rock powder, the mixing of rock powder can suppress spontaneous combustion of coal. 1 and above, the coal left by coal basically lost the danger of spontaneous combustion. When the mixed rock powder particle size is larger than the critical particle size and close to the peak particle size, the mixed rock powder has the highest efficiency in prevention and control of coal spontaneous combustion. Under the condition of reasonable amount of rock powder and particle size, it is feasible to control spontaneous combustion of coal with rock powder.