Effect of solution composition on the optimum redox potential for chalcopyrite leaching in sulfuric acid solutions
Effect of solution composition on the optimum redox potential for chalcopyrite leaching in sulfuric acid solutions
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DOI：
10.1016/j.hydromet.2007.12.005
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发表时间：
2008-03-01
期刊：
影响因子：
4.7
通讯作者：
Tsunekawa, Masami
中科院分区：
文献类型：
--
作者：
Hiroyoshi, Naoki;Kitagawa, Hiroko;Tsunekawa, Masami
硫酸溶液中Fe 3+对黄铜矿（CuFeS 2）的浸出率取决于Fe 3 +/Fe 2+浓度比所决定的氧化还原电位，在最佳氧化还原电位处浸出率最大。本研究通过电化学测量，使用CuFeS 2电极和含有0.01-1 kmol m（-3）H2SO 4、Fe 2+、CuFeS 2电极的阳极极化曲线表明，在Cu 2+存在下，CuFeS 2电极的阳极极化曲线上出现一个电流峰Fe对应最大浸出率。随着Cu 2+浓度的增加，该峰的氧化还原电位显着升高，而H2SO 4和Fe 2+浓度对该峰的氧化还原电位影响不大。这些结果与先前报道的浸出实验结果一致，并且表明黄铜矿浸出的最佳氧化还原电位是Cu 2+浓度的函数。提出了CuFeS 2浸出最佳氧化还原电位的经验公式。(c)2008 Elsevier B. V.保留所有权利。
The leaching rate of chalcopyrite (CuFeS2) by Fe3+ in H2SO4 solutions depends on the redox potential determined by the Fe3+/Fe2+ concentration ratio, and there is a maximum leaching rate at an optimum redox potential. The present study investigated the effects of solution composition on the optimum redox potential by electrochemical measurements using a CuFeS2 electrode and electrolyte solutions containing 0.01-1 kmol m(-3) of H2SO4, Fe2+, and Cu2+ at 298 K in nitrogen.Anodic-polarization curves of the CuFeS2 electrode showed that there was a current peak on the curves in the presence of Cu2+ and Fe corresponding to the maximum leaching rate. The redox potential of the peak increased markedly with increasing Cu2+ concentration, while it was little affected by the H2SO4 and Fe2+ concentrations. These results agree with the results of leaching experiments reported previously, and indicate that the optimum redox potential for chalcopyrite leaching is a function of the Cu2+ concentration. An empirical equation for the optimum redox potential for CuFeS2 leaching is proposed. (c) 2008 Elsevier B.V. All rights reserved.