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Effect of pyrite on the electrochemical behavior of chalcopyrite at different potentials in pH 1.8 H2SO4
Qingyou Liu;  Shuai Wang;  Miao Chen;  Yi Yang
2019
发表期刊Journal of Chemical Research
卷号43期号:11-12页码:493-502
摘要

Chalcopyrite is the most abundant, but also one of the most refractory, copper sources. One way to enhance chalcopyrite’s electrochemical dissolution is by mixing it with pyrite. To understand how and to what extent pyrite affects chalcopyrite’s electrochemical dissolution at different potentials, the electrochemical behaviors of chalcopyrite, pyrite, and chalcopyrite–pyrite couples in pH 1.8 H2SO4 were studied by potentiodynamic and electrochemical impedance spectroscopy. Potentiodynamic curves showed their different electrochemical reaction states and electrode surface characteristics. From open-circuit potential to 470 mV (vs saturated calomel electrode), chalcopyrite–pyrite was passivated with Cu1−xFe1−yS2 [Math Processing Error](y≫x); from 470 to 580 mV, trans-passive dissolution occurred, and in the passive region, Cu1−xFe1−yS2 transformed into Cu1−xzS2; from 580 to 700 mV was an active region; and a pseudo-passive region was formed with CuS when the potential was above 700 mV. The smaller charge transfer resistance and passive resistance, as well as the smaller inductive relaxation, revealed how and to what extent the coupled pyrite accelerated the electrochemical dissolution of chalcopyrite.

关键词Chalcopyrite Electrochemical Electrochemical Impedance Spectroscopy Potentiodynamic Pyrite
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10816
专题地球内部物质高温高压实验室
作者单位1.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
2.University of Chinese Academy of Sciences, Beijing, China
3.CSIRO Mineral Resources Flagship, Clayton, VIC, Australia
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Qingyou Liu;Shuai Wang;Miao Chen;Yi Yang. Effect of pyrite on the electrochemical behavior of chalcopyrite at different potentials in pH 1.8 H2SO4[J]. Journal of Chemical Research,2019,43(11-12):493-502.
APA Qingyou Liu;Shuai Wang;Miao Chen;Yi Yang.(2019).Effect of pyrite on the electrochemical behavior of chalcopyrite at different potentials in pH 1.8 H2SO4.Journal of Chemical Research,43(11-12),493-502.
MLA Qingyou Liu;Shuai Wang;Miao Chen;Yi Yang."Effect of pyrite on the electrochemical behavior of chalcopyrite at different potentials in pH 1.8 H2SO4".Journal of Chemical Research 43.11-12(2019):493-502.
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