中南大学学报（自然科学版）2011，Vol.42Issue(8)：2469-2474,6.
硫化矿石自燃的热分析动力学
Thermal analysis kinetics of sulfide ores for spontaneous combustion
摘要
Abstract
In order to obtain spontaneous combustion kinetics parameters, simultaneous thermal analysis technology was used to test oxidation and decomposition reactions of a typical sulfide ore sample from 28 to 800 °C. The corresponding TG, DTG, and DSC curves at heating rates of 5,10 and 15℃/min were gained. Based on Coats-Redfern integral method, the correlation coefficients of in[g(a)/T2] versus \IT for TG datum between 480 and 580 °C was analyzed using 11 different kinetics mechanism functions. The results show that the maximum mass loss occurs at temperatures of 516.597, 516.981 and 580.493 V. The kinetics reaction process of the sample complies with the diffusion one-way transport mechanism. The corresponding activation energy values calculated at 5, 10 and 15 ℃/min are 247.009, 251.307 and 196.26 kJ/mol, and pre-exponential factors are 1.873x1013, 4.259x1013 and 5.226x109 S-1 respectively. And the kinetics functions are also gained. The idea of evaluating spontaneous combustion tendency of sulfide ores by activation energy index is put forward. This method has some excellences with quick test velocity, little quantum of sample consumption, and low test cost, so it can be applied in spontaneous combustion tendency assessment of sulfide ores.关键词
硫化矿石/自燃倾向性/热分析/动力学/活化能Key words
sulfide ores/ spontaneous combustion tendency/ thermal analysis/ kinetics/ activation energy分类
资源环境引用本文复制引用
阳富强,吴超,刘辉,潘伟,崔燕..硫化矿石自燃的热分析动力学[J].中南大学学报（自然科学版）,2011,42(8):2469-2474,6.基金项目
国家“十一五”科技支撑计划项目(2006BAK04B03-02) （2006BAK04B03-02）
教育部博士生学术新人奖专项资助项目(1343-7113400111) （1343-7113400111）
中南大学优秀博士学位论文扶植项目(2009yb047) （2009yb047）
中南大学研究生学位论文创新基金资助项目(1960-71131 100023) （1960-71131 100023）
中南大学贵重仪器设备开放中心基金资助项目(ZKJ2009008) （ZKJ2009008）
