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Spontaneous combustion tendency of fresh and pre-oxidized sulfide ores
引用本文:YANG Fu-qiang,WU Chao,LI Zi-jun. Spontaneous combustion tendency of fresh and pre-oxidized sulfide ores[J]. 中南工业大学学报(英文版), 2014, 0(2): 715-719
作者姓名:YANG Fu-qiang  WU Chao  LI Zi-jun
基金项目:Project(51304051)supported by the National Natural Science Foundation of China;Project(2012J05088)supported by the Natural Science Foundation of Fujian Province,China;Project(022409)supported by School Talent Award of Fuzhou University,China;Project(2013-XQ-18)supported by Science&Technology Development Foundation of Fuzhou University,China
摘    要:
Three representative sulfide ore samples were collected from typical metal mines,and their corresponding pre-oxidized products were obtained under nature environment.The thermal behaviors of each sample at heating rates of 5,10,15 and 20 °C/min in air flow from ambient temperature to 800 °C were studied by simultaneous thermal analysis and the TG/DSC curves before and after the pre-oxidation were compared.By the peak temperature of DTG curves,the whole reaction process for each sample was divided into different stages,and the apparent activation energies were calculated by the Ozawa-Flynn-Wall method.The results show that the reaction process of each sample after pre-oxidation is more complex,with quicker reaction rates,fewer heat production quantities,and higher or lower ignition-points.The apparent activation energies decrease from 364.017-474.228 kJ/mol to 244.523- 333.161 kJ/mol.Therefore,sulfide ores are more susceptible to spontaneous combustion after the pre-oxidation.

关 键 词:自燃倾向性  硫化矿石  预氧化  表观活化能  新鲜  环境温度  反应过程  DSC曲线

Spontaneous combustion tendency of fresh and pre-oxidized sulfide ores
Affiliation:[1]College of Environment and Resources, Fuzhou University, Fuzhou 350108, China; [2]School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Abstract:
sulfide ores spontaneous combustion tendency apparent activation energy pre-oxidation
Keywords:sulfide ores  spontaneous combustion tendency  apparent activation energy  pre-oxidation
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