Apparent activation energy for spontaneous combustion of sulfide concentrates in storage yard

作者：Yang Fu-qiang^*; Wu Chao; Cui Yan; Lu Guang

来源：Transactions of Nonferrous Metals Society of China, 2011, 21(2): 395-401.

DOI：10.1016/S1003-6326(11)60727-9

• apparent activation energy
• sulfide concentrates
• spontaneous combustion
• thermogravimetry (TG) analysis
• differential scanning calorimetry (DSC)

In order to evaluate the spontaneous combustion hazard of sulfide concentrates in storage, three different kinds of sulfide concentrates (sulfur-rich sulfide concentrate, iron sulfide concentrate and copper sulfide concentrate) were obtained from a storage yard in Dongguashan Copper Mine, China. The reaction processes at different heating rates of 5, 10, 15, 20, and 25 degrees C/min in air flow from ambient temperature to 1 000 degrees C were studied by TG-DTG-DSC analysis. By the peak temperatures of DTG curves, the whole reaction process for each sample was divided into different stages, and the corresponding apparent activation energies were calculated by the Ozawa-Flynn-Wall method. It is found that the reaction process of each sample is considerably complex; the apparent activation energy values change from 36 to 160 kJ/mol in different temperature ranges; sulfur-rich sulfide and iron sulfide concentrates have lower apparent activation energy than copper sulfide concentrate below 150 C; so they are more inclined to cause spontaneous combustion at ambient temperature.

• 出版日期2011-2
• 单位中南大学