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利用自制反应器研究了黄铁矿的化学氧化溶解动力学过程,对氧化产物进行分析。结果显示:在温度为45～90℃内,黄铁矿的活化能为37.00 kJ·mol-1,结合黄铁矿的浸出率不受搅拌速度影响,认为黄铁矿的浸出过程受化学控制;溶液中Fe3+浓度与酸度影响黄铁矿的浸出;S物相分析与EDS图谱结果显示黄铁矿中的硫经过一系列中间形态,最终氧化成SO24-,并且有部分单质硫生成。由于S2O23-为中间关键的转化步骤,结合XPS图谱分析,认为S2O23-为中间过程的氧化机制。
The self-made reactor was used to study the chemical oxidation kinetics of pyrite. The oxidation products were analyzed. The results show that the activation energy of pyrite is 37.00 kJ · mol-1 at 45 ~ 90 ℃, and the leaching rate of pyrite is not affected by the stirring rate. The leaching process of pyrite is controlled by chemical control. The concentration and acidity of Fe3 + in the solution affected the leaching of pyrite. The phase analysis and EDS analysis of S showed that the sulfur in pyrite undergoes a series of intermediate morphologies and eventually oxidized to SO24- with some elemental sulfur formed. Since S2O23- is the key intermediate transformation step, combined with XPS pattern analysis, it is considered that S2O23- is the oxidation mechanism of intermediate process.