Chalcopyrite leaching has slow kinetics in sulfate media compared to other copper minerals. Studies have shown that these slow kinetics are caused by a passivation layer generated during the mineral’s dissolution and/or by its semiconductor properties. In the continuous search for regents to improve kinetics, the use of iodide in sulfate media has led to a significant improvement in the leaching rate of copper from chalcopyrite. However, no detailed information on the effect of the chloride concentration in this system has been informed so far. In this present work, the leaching of a chalcopyrite concentrate using iodide in chloride solution was evaluated, varying parameters such as temperature, particle size, the initial potential of the solution, chloride, iodide, and cupric ion concentrations. The results indicated a copper extraction of 75.8 % in 30 days in the presence of 50 g/L chloride, a 43.1 % more than in the absence of chloride (32.7 % extraction) obtained under the same conditions (100 mg/L I, 0.5 g/L Cu, 9 g/L Fe, 1 g/L Fe, pH = 1.5, 35 °C and an initial potential solution of 700 mV vs SHE). Additionally, the most statistically significant factors on copper extraction in order of influence were temperature, iodide concentration, and chloride concentration.

中文翻译：

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酸性氯化物溶液中碘化物辅助浸出黄铜矿精矿：不同参数对铜提取率的影响


与其他铜矿物相比，黄铜矿浸出在硫酸盐介质中的动力学较慢。研究表明，这些缓慢的动力学是由矿物溶解过程中产生的钝化层和/或其半导体特性引起的。在不断寻找改善动力学的试剂的过程中，在硫酸盐介质中使用碘化物显着提高了黄铜矿中铜的浸出率。然而，到目前为止，还没有关于该系统中氯化物浓度影响的详细信息。在目前的工作中，评估了在氯化物溶液中使用碘化物浸出黄铜矿精矿的情况，改变了温度、粒度、溶液的初始电势、氯化物、碘化物和铜离子浓度等​​参数。结果表明，在 50 g/L 氯化物存在的情况下，30 天内铜的提取率为 75.8%，比在相同条件（100 mg/L I，0.5 g /L Cu，9 g/L Fe，1 g/L Fe，pH = 1.5，35 °C，初始电位溶液为 700 mV（相对于 SHE）。此外，对铜提取最具有统计学意义的因素按影响顺序排列是温度、碘化物浓度和氯化物浓度。