Developing new and sustainable leaching system with limited release of pollutant and low acid and energy consumption is a challenge for copper extraction from chalcopyrite. In this work, a hydrometallurgical process for chalcopyrite dissolution in 1-ethyl-3-methyl-imidazolium hydrogen sulfate ([EMIm]HSO₄) media with potassium dichromate (K₂Cr₂O₇) was developed, and the leaching behavior of chalcopyrite with various parameters, such as kinds of ionic liquids (ILs), concentrations of [EMIm]HSO₄ and K₂Cr₂O₇, stirring speed, leaching temperature, and particle size were discussed in detail. The result show that the most effective ILs medium for chalcopyrite dissolution was varied with the specific oxidant. The leaching rate of chalcopyrite was significantly enhanced by increasing temperature, concentrations of K₂Cr₂O₇ and [EMIm]HSO₄, and decreasing particle size, while it has little to do with the increasing of stirring speed. The maximum copper extraction yield of 90.2% was reached within 90 min under the following optimized conditions: 10 g/L of solid/liquid ratio, 10 vol% of [EMIm]HSO₄ concentration, 0.1 M of initial K₂Cr₂O₇ concentration, stirring speed of 200 rpm, the temperature of 70 °C and particle size of −45 µm. The leaching process of chalcopyrite in [EMIm]HSO₄-K₂Cr₂O₇ aqueous solution follows an empirical kinetic model $\text{1-2/3}x\text{-}{(1\text{-}x)}^{\text{2/3}}={\mathit{k}}_{\text{d}}\mathit{t}$ with the apparent activation energy of 36.26 kJ/mol, which was limited by the diffusion through a protect layer of elemental sulfur and pyrite.

开发新的、可持续的、污染物释放量少、酸和能耗低的浸出系统是从黄铜矿中提取铜的挑战。在这项工作中，开发了一种用重铬酸钾 (K ₂ Cr ₂ O ₇ )在 1-乙基-3-甲基-咪唑硫酸氢盐 ([EMIm]HSO ₄ ) 介质中溶解黄铜矿的湿法冶金工艺，并研究了黄铜矿的浸出行为具有各种参数，例如离子液体 (IL) 的种类、[EMIm]HSO ₄和 K ₂ Cr ₂ O _{7 的}浓度详细讨论了搅拌速度、浸出温度和粒度。结果表明，溶解黄铜矿最有效的离子液体介质随特定氧化剂的不同而变化。随着温度的升高、K ₂ Cr ₂ O ₇和[EMIm]HSO _{4 的}浓度和粒径的减小，黄铜矿的浸出率显着提高，而与搅拌速度的提高无关。在以下优化条件下，90 min内铜提取率最高可达90.2%：固液比10 g/L，[EMIm]HSO ₄浓度10 vol% ，初始K ₂ Cr ₂ O ₇ 0.1 M浓度，200 rpm 的搅拌速度，70 °C 的温度和-45 µm 的粒径。[EMIm]HSO ₄ -K ₂ Cr ₂ O ₇水溶液中黄铜矿的浸出过程遵循经验动力学模型$\text{1-2/3}X\text{——}{(1\text{——}X)}^{\text{2/3}}={\mathit{克}}_{\text{d}}\mathit{吨}$ 表观活化能为 36.26 kJ/mol，这受到元素硫和黄铁矿保护层扩散的限制。