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Mixed Potential Plays a Key Role in Leaching of Chalcopyrite: Experimental and Theoretical Analysis
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-01-25 00:00:00 , DOI: 10.1021/acs.iecr.7b02051 Congren Yang 1, 2 , Wenqing Qin 1 , Hongbo Zhao 1 , Jun Wang 1 , Xingjie Wang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-01-25 00:00:00 , DOI: 10.1021/acs.iecr.7b02051 Congren Yang 1, 2 , Wenqing Qin 1 , Hongbo Zhao 1 , Jun Wang 1 , Xingjie Wang 1
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The mixed potential plays a key role in leaching of chalcopyrite. Therefore, the impact of Fe2+ and Fe3+ on chalcopyrite leaching was investigated in this work. Simultaneously, the chalcopyrite passive film was studied by applying cyclic voltammetry (CV), potentiodynamic, potentiostatic, and Tafel polarization. X-ray photoelectron spectroscopy (XPS) was used to analyze the products formed during the electrochemical treatment of chalcopyrite. Furthermore, the band theory was used to analyze the oxidation and reduction of chalcopyrite. High copper extraction percentage was obtained at a low mixed potential or ratio of Fe3+/Fe2+. The empty states of chalcopyrite overlapped with filled states of Fe2+; chalcopyrite captured electrons from Fe2+ and was reduced to chalcocite, which was very easily oxidized by Fe3+. The Fe dissolves preferentially from the chalcopyrite surface in the potential range from 475 to 700 mV and leave behind a S22– and Sn2– passive film. The chalcopyrite transpassive dissolution occurs above 700 mV.
中文翻译：
混合电位在黄铜矿浸出中起关键作用：实验和理论分析
混合电位在黄铜矿浸出中起关键作用。因此，研究了Fe 2+和Fe 3+对黄铜矿浸出的影响。同时，通过应用循环伏安法（CV），恒电位，恒电位和Tafel极化研究了黄铜矿钝化膜。X射线光电子能谱（XPS）用于分析黄铜矿的电化学处理过程中形成的产物。此外，带理论被用来分析黄铜矿的氧化和还原。在低混合电位或Fe 3+ / Fe 2+比率下获得高的铜提取率。黄铜矿的空态与Fe 2+的填充态重叠; 黄铜矿从Fe 2+捕获电子，并还原为黄铜矿，非常容易被Fe 3+氧化。Fe在475至700 mV的电位范围内优先从黄铜矿表面溶解，并留下S 2 2–和S n 2–钝化膜。黄铜矿的超被动溶解发生在700 mV以上。
更新日期：2018-01-25
中文翻译：
混合电位在黄铜矿浸出中起关键作用：实验和理论分析
混合电位在黄铜矿浸出中起关键作用。因此，研究了Fe 2+和Fe 3+对黄铜矿浸出的影响。同时，通过应用循环伏安法（CV），恒电位，恒电位和Tafel极化研究了黄铜矿钝化膜。X射线光电子能谱（XPS）用于分析黄铜矿的电化学处理过程中形成的产物。此外，带理论被用来分析黄铜矿的氧化和还原。在低混合电位或Fe 3+ / Fe 2+比率下获得高的铜提取率。黄铜矿的空态与Fe 2+的填充态重叠; 黄铜矿从Fe 2+捕获电子，并还原为黄铜矿，非常容易被Fe 3+氧化。Fe在475至700 mV的电位范围内优先从黄铜矿表面溶解，并留下S 2 2–和S n 2–钝化膜。黄铜矿的超被动溶解发生在700 mV以上。
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