Bioleaching is an effective technique for treating low-grade copper sulfide ore, but low leaching rate limit its industrial application of chalcopyrite bioleaching. Many passivation film compositions have been hypothesized to explain the difficulty of chalcopyrite leaching, but the essential reason remain unclear. Mechanical activation can not only reduce the solid particle size, but also result in lattice defects and induce redox reactions, and even affect the electronic structure of the solid. Therefore, the mechanical activation enhanced chalcopyrite leaching and its influence mechanism was investigated. The main conclusions are as follows: mechanical activation can significantly reduce chalcopyrite particle size, simultaneously, microscopic strain and cell volume increased; the mechanical activation changed the energy band structure of chalcopyrite—the positions of the conduction band and the valence band were positively shifted, implying that Fe could more easily capture electrons from the chalcopyrite surface to be reduced, thus the leaching rate of chalcopyrite increased significantly in in Fe solution. The results show that the passivation film may affect the leaching of chalcopyrite, but the structural characteristics of chalcopyrite is the essential reason for the difficulty of chalcopyrite leaching.

中文翻译：

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通过机械活化增强黄铜矿浸出：微观结构的新见解


生物浸出是处理低品位硫化铜矿的有效技术，但浸出率低限制了黄铜矿生物浸出的工业应用。人们假设了许多钝化膜成分来解释黄铜矿浸出的困难，但其根本原因仍不清楚。机械活化不仅可以减小固体颗粒尺寸，还会产生晶格缺陷并诱发氧化还原反应，甚至影响固体的电子结构。因此，对机械活化强化黄铜矿浸出及其影响机制进行了研究。主要结论如下：机械活化可显着减小黄铜矿粒径，同时显微应变和晶胞体积增大；机械活化改变了黄铜矿的能带结构，导带和价带的位置发生正移，这意味着Fe更容易从黄铜矿表面捕获电子而被还原，从而黄铜矿的浸出率显着增加。在铁溶液中。结果表明，钝化膜可能会影响黄铜矿的浸出，但黄铜矿的结构特征是黄铜矿浸出困难的本质原因。