热重与差示扫描量热分析法联用研究硫化矿石的热性质  

Thermal Properties of Sulfide Ores Determined by Using Thermogravimetric and Differential Scanning Calorimetric Method

作　　者：阳富强[1,2] 吴超[1,2] 石英[1,2] 

机构地区：[1]中南大学资源与安全工程学院,长沙410083 [2]国家金属矿安全科学技术研究中心,长沙410083

出　　处：《科技导报》2009年第22期66-71,共6页Science & Technology Review

基　　金："十一五"国家科技支撑计划项目(2006BAK04B03-02);中南大学研究生学位论文创新基金项目(1960-71131100023);中南大学贵重仪器设备开放中心基金项目(ZKJ2009008)

摘　　要：为了判定硫化矿石的自燃倾向性,对含有不同矿物成分的2种硫化矿样在升温速率分别为5,10和15℃/min条件下的氧化分解行为进行了热重和差示扫描量热联用分析,得到2种矿样在不同条件下的TG、DTG以及TG-DTG-DSC曲线,并获取其氧化燃烧过程中的特性参数,包括矿样的着火点温度,吸(放)热,以及增(失)重的温度区间等。运用Flynn-Wall-Ozawa法计算出2种矿样的反应活化能分别为387.32和448.50kJ·mol-1。结果表明,热重分析法和差示扫描量热分析法具有较好的互补性,联合应用在硫化矿石的氧化分解过程中能充分体现整个化学反应过程,在多样本条件下解算求得的活化能值可以作为判定其自燃倾向性大小的指标。In order to evaluate the spontaneous combustion tendency of sulfide ores, the oxidation and decomposition behavior of two samples （marked by No. 1, No. 2） were analyzed. The contents of different minerals in the ores were measured by both Thermogravimetric analysis （TG） and Differential Scanning Calorimetry analysis （DSC） at heating rates of 5, 10 and 15℃/min. The curves of TG, DTG and TG-DTG-DSC for each sample under different conditions were determined. Their combustion characteristic parameters were obtained, including the ignition points, temperature intervals of heat-absorption （radiation） and weight-gain （loss）. The reaction activation energy for No. 1 and No. 2 samples was calculated by the. Flynn-Wall-Ozawa method, with the results of 387.32 and 448.50 kJ/mol, respectively, which shows that a complement of TG method and DSC method is well achieved; the whole reaction process of sulfide ores can be reflected by their joint application; the gained activation energy can be used as indexes to evaluate spontaneous combustion tendency of sulfide ores under the condition of multiple samples being measured at the same time.

关 键 词：硫化矿石 热重分析 差示扫描量热分析 活化能 自燃倾向性 

分 类 号：P575[天文地球—矿物学]