基于活化能指标的硫铁矿石自燃倾向性研究

Study on the spontaneous combustion tendency of Pyrite Stone based on activation energy index

在硫铁矿石自燃及热分析动力学基础上,结合水鑫黄铁矿3种矿样,运用热重分析手段对矿石从常温到燃点之问的氧化过程进行研究,用不同动力学模型对热重数据进行相关性分析。结果表明,硫铁矿石氧化热解过程符合一级反应动力学机制。运用热分析动力学方法求出矿样在不同升温速率下的活化能,发现随着升温速率的增加,矿样的活化能逐渐增火,自燃倾向性减小;但随着含硫量的增加,矿样的活化能逐渐减小,自燃倾向性增大。

Based on the spontaneous combustion and thermal analysis kinetics as well as referring to the thermo-gravimetric experiment on 3 mineral samples from the Yong-Xin-Prite, the oxidation thermal decomposition process of pyrite stones between room temperature and ignition point was studied. The data of thermal gravimetric analysis is processed by the functions of different kinetic mechanism models and their correlation was analyzed as well. The results show that the process of oxidation thermal decomposition of pyrite stones complies with the kinetic mechanism of first order chemical reaction, in which the kinetic parameters of activated energy could be derivode found that with the increase of heating rate, the activation energy of mineral sample is gradually increasing, which means the spontaneous combustion tendency is decreasing. We also found that with the increase of sulfur content, the activation energy of mineral sample is gradually decreasing, which means the spontaneous combustion tendency is increasing. As conclusion, the identification of spontaneous combustion tendency of pyrite-stone based on activation energy index is scientific and objective. It has a great significance to safety management and assessment of pyrite mining.