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首页> 外文会议>International Conference on Copper 2003-Cobre 2003 v.6 book 1; 20031130-20031203; Santiago; CL >Mechanisms of catalytic leaching of chalcopyrite
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Mechanisms of catalytic leaching of chalcopyrite

机译：黄铜矿的催化浸出机理

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摘要

Slow leaching kinetics of a common copper source, chalcopyrite, is a major problem in the development of hydrometallurgical processes for copper extraction. In particular, the leaching kinetics in H2SO4 solutions, the most economical media, is much slower than that in other media such as HC1. To improve the leaching kinetics, addition of catalysts such as Ag(Ⅰ), Bi(Ⅲ), or activated carbon has been proposed. In the present study, a new reaction model for the role of these catalysts is proposed. The model assumes that the catalysts remove H_2S from the liquid phase by forming metal sulfides in the case of Ag(Ⅰ) and Bi(Ⅲ), or for activated carbon a catalytic decomposition of H_2S. This enhances the chalcopyrite reduction to H_2S and Cu_2S, causing a more rapid copper extraction due to the oxidative dissolution of the intermediate Cu_2S. Thermodynamic calculations based on the model predict that the copper extraction rate is higher at redox potentials below a critical value corresponding to the potential of the Cu_2S formation, and that the critical potential is increased by the addition of the catalysts. The prediction agreed well with the results of leaching experiments.
机译：普通铜源黄铜矿的缓慢浸出动力学是湿法冶金铜萃取过程中的主要问题。特别是，H2SO4溶液（最经济的介质）中的浸出动力学要比HCl等其他介质中的浸出动力学慢得多。为了提高浸出动力学，提出了添加催化剂如Ag（Ⅰ），Bi（Ⅲ）或活性炭的方法。在本研究中，针对这些催化剂的作用提出了一种新的反应模型。该模型假设，在Ag（Ⅰ）和Bi（Ⅲ）的情况下，催化剂通过形成金属硫化物从液相中除去H_2S；对于活性炭，H_2S的催化分解则是这样。这将黄铜矿还原成H_2S和Cu_2S的过程，由于中间Cu_2S的氧化溶解，导致更快的铜萃取。基于该模型的热力学计算预测，在氧化还原电势低于对应于Cu_2S形成电势的临界值的情况下，铜的提取率更高，并且通过添加催化剂，临界电势会增加。该预测与浸出实验的结果非常吻合。

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