In order to study the effect of oxygen concentrations on the change of active groups in the oxidation process of coal gangue, the airflows of different oxygen concentrations were prepared to simulate the oxidation and heating process of coal gangue under oxygen concentrations of 0%, 5%, 10%, 15%, and 21%. During the oxidation and heating process, the free radical parameters were measured at different temperatures in real time. The results show that in the early stage of coal gangue oxidation, the g factor remains at a lower level and do not start to increase until certain temperatures are reached. Besides, the higher the oxygen concentration is, the lower the temperature at which the g factor begins to increase. When the oxygen concentrations are 0%, 5%, 10%, 15%, and 21%, the corresponding temperatures are 225, 200, 150, 150, and 125°C, respectively. Furthermore, with the increase of oxidation temperature, the free radical concentrations experience four stages, namely, the slow increase stage, the rapid increase stage, the stagnant increase stage, and the final increase stage. And the higher the oxygen concentration is, the shorter the free radical stagnant increase stage is. During the oxidation of coal gangue, the line widths decrease slowly before 150°C, and then start to plunge and finally stabilize near the minimum at 350°C. Moreover, the higher the oxygen concentration is, the smaller the minimum values of line widths are. In the oxidation process of coal gangue, the gas product CO amounts are first at a lower level, and then begin to increase rapidly after 150°C. At the same temperature, the increased rates of CO production in coal gangue under the oxygen concentrations of 10%, 15%, and 21% are significantly higher than those under the oxygen concentrations of 0% and 5%. Based on the variation law of free radical parameters in coal gangue under different oxygen concentrations, the actual spontaneous combustion of gangue hills was analyzed and the free radical reaction mechanism of spontaneous combustion of gangue hills was discussed. The research results are of guiding significance for the treatment of spontaneous combustion of coal gangue.

中文翻译：

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不同氧浓度下煤矸石自燃过程中自由基和指标气体CO的变化

为研究氧浓度对煤矸石氧化过程中活性基团变化的影响，制备不同氧浓度的气流，模拟氧浓度为0%、5%的煤矸石氧化加热过程。 、10%、15% 和 21%。在氧化和加热过程中，实时测量不同温度下的自由基参数。结果表明，煤矸石氧化初期，g因子保持在较低水平，直到达到一定温度才开始增加。此外，氧浓度越高，g因子开始增加的温度越低。当氧气浓度为0%、5%、10%、15%、21%时，对应的温度分别为225、200、150、150、125℃，分别。此外，随着氧化温度的升高，自由基浓度经历了四个阶段，即缓慢增加阶段、快速增加阶段、停滞增加阶段和最终增加阶段。并且氧浓度越高，自由基停滞增加阶段越短。煤矸石氧化过程中，线宽在150°C前缓慢减小，然后开始下降，最终稳定在350°C附近的最小值附近。此外，氧浓度越高，线宽的最小值越小。在煤矸石氧化过程中，气体产物CO量先处于较低水平，150℃后开始迅速增加。在同样的温度下，氧浓度为10%、15%和21%时煤矸石中CO生成率的增加率明显高于氧浓度0%和5%的情况。根据不同氧浓度下煤矸石自由基参数的变化规律，分析了煤矸石山的实际自燃情况，探讨了煤矸石山自燃的自由基反应机理。研究成果对煤矸石自燃的治理具有指导意义。分析了矸石山自燃的实际情况，探讨了矸石山自燃的自由基反应机理。研究成果对煤矸石自燃的治理具有指导意义。分析了矸石山自燃的实际情况，探讨了矸石山自燃的自由基反应机理。研究成果对煤矸石自燃的治理具有指导意义。