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Influence of Temperature and Potential on the Electrochemical Dissolution of Galena in HNO3 at pH 2.0
Qingyou Liu;  Guoheng Jin;  Kai Zheng;  Xiaoying Wen;  Heping Li
2017
Source PublicationInternational Journal of Electrochem Science
Volume12Issue:8Pages:7004-7016
Abstract

We investigated the influence of temperature and add potential on the electrochemical dissolution of galena in HNO3 at pH 2.0. Potentiodynamic curves showed galena different electrochemical reaction states. From OCP to 160 mV (vs. saturated calomel electrode) galena was passivated with S-0, 160-320 mV was active dissolution, S-0 transformed into S2O32-, and potential above 320 mV was doubleinductive area, S2O32- transformed into SO42-. High temperature accelerates galena electrochemical dissolution, when temperature increases from 25 degrees C to 40 degrees C, and then to 55 degrees DC, the promotion efficiency is 233.33% and 322.22%, respectively. Electrochemical impedance spectroscopy (EIS) results are well in agreement with the three potential regions, and reveal the cause that high temperature accelerates galena electrochemical due to decreases charge transform resistance and passive resistance at passive potential area. These experimental results will give experimental basis for galena weathering explains and hydrometallurgy applied.

KeywordGalena Electrochemical Temperature Potential Potentiodynamic Curve Eis
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8042
Collection地球内部物质高温高压实验室
Affiliation1.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.University of Chinese Academy of Sciences, Beijing, 100039, China
Recommended Citation
GB/T 7714
Qingyou Liu;Guoheng Jin;Kai Zheng;Xiaoying Wen;Heping Li. Influence of Temperature and Potential on the Electrochemical Dissolution of Galena in HNO3 at pH 2.0[J]. International Journal of Electrochem Science,2017,12(8):7004-7016.
APA Qingyou Liu;Guoheng Jin;Kai Zheng;Xiaoying Wen;Heping Li.(2017).Influence of Temperature and Potential on the Electrochemical Dissolution of Galena in HNO3 at pH 2.0.International Journal of Electrochem Science,12(8),7004-7016.
MLA Qingyou Liu;Guoheng Jin;Kai Zheng;Xiaoying Wen;Heping Li."Influence of Temperature and Potential on the Electrochemical Dissolution of Galena in HNO3 at pH 2.0".International Journal of Electrochem Science 12.8(2017):7004-7016.
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