ABSTRACT An investigation on copper leaching from a chalcopyrite concentrate in methanesulfonic acid (MSA) and hydrogen peroxide at 75°C was carried out. Periodic additions of H2O2 were applied to enhance chalcopyrite dissolution and the reaction mechanism was analyzed using a shrinking core model. The results revealed that compared with the addition of H2O2 at the very beginning, periodic additions of H2O2 enhanced copper extraction and leaching kinetics, and the rate-determining step shifted from the diffusion of oxidant to the surface chemical reaction. The reaction orders with respect to MSA and H2O2 were found to be 0.19 and 1.26, respectively, suggesting the leaching process was highly dependent on H2O2 concentration. Calculated activation energy between the temperature range of 25–75°C was 79.8 kJ/mol. Detailed study also indicated the reaction mechanism is diffusion-controlled through a protective sulfur layer at lower temperature and surface chemical reaction-controlled at temperatures higher than 55°C. Overall, the MSA–H2O2 leaching system is a green method for chalcopyrite leaching and a possible flowsheet in the industrial application with the periodic additions of H2O2.

中文翻译：

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缩芯模型在甲磺酸过氧化氢中从黄铜矿中浸出铜的动力学和机理研究

摘要 研究了在 75°C 下在甲磺酸 (MSA) 和过氧化氢中从黄铜矿精矿中浸出铜的情况。定期添加 H2O2 以增强黄铜矿溶解，并使用收缩核心模型分析反应机理。结果表明，与一开始加入H2O2相比，周期性加入H2O2增强了铜的提取和浸出动力学，并且决定速率的步骤从氧化剂的扩散转移到表面化学反应。发现关于 MSA 和 H2O2 的反应阶数分别为 0.19 和 1.26，表明浸出过程高度依赖于 H2O2 浓度。在 25-75°C 的温度范围内计算的活化能为 79.8 kJ/mol。详细研究还表明，反应机理在较低温度下通过保护性硫层进行扩散控制，在高于 55°C 的温度下通过表面化学反应进行控制。总体而言，MSA-H2O2 浸出系统是一种绿色的黄铜矿浸出方法，也是工业应用中周期性添加 H2O2 的可能流程。