机械活化黄铜矿浸出动力学研究

Effects of mechanical activation on chalcopyrite leaching kinetics

摘要: 研究了机械活化对黄铜矿浸出率的影响并进行了动力学分析。利用X射线衍射仪、激光粒度分析仪测试了机械活化对黄铜矿晶体结构、粒度的影响。结果表明：机械活化可细化黄铜矿颗粒粒径、破坏黄铜矿晶粒完整性、降低黄铜矿活化能、提高黄铜矿反应活性。黄铜矿机械活化1 h后，浸出活化能从29.27 kJ/mol降低至16.87 kJ/mol。当黄铜矿与氧化剂(NaClO₂)共磨相同时间后，活化能降至12.31 kJ/mol，黄铜矿反应模型从化学反应转变为扩散反应。

Abstract: The effects of mechanical activation on chalcopyrite leaching and its kinetics were investigated in this study.The microstructure and particle size of chalcopyrite were modified via mechanical activation.Specifically, the integrity of chalcopyrite crystal grains was disrupted and the grain size was refined.In addition, its reactivity was increased due to the decreased activation energy from 29.27 kJ/mol to 16.87 kJ/mol after 1hour’s mechanical activation, which was further decreased to 12.31 kJ/mol when chalcopyrite was ground in the presence of oxidant (NaClO₂).In addition, chalcopyrite leaching reaction was transformed from chemical reaction to diffusion reaction.