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In Situ Electrochemical Investigation of Acidic Pressure Oxidation of Pyrite at 160-240 degrees C | |
Can Cu; Heping Li; Sen Lin; Pan Wang | |
2018 | |
Source Publication | Journal of The Electrochemical Society
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Volume | 165Issue:5Pages:C289-C294 |
Abstract | In situ electrochemical studies on the oxidation behavior of pyrite in 0.1 M H2SO4 solution in the temperature range of 160 to 240 degrees C were performed by measurements of electrochemical impedance spectroscopy (EIS), linear polarization, potentiodynamic polarization and potentiostatic polarization. Results showed that with the increase of temperature, the anodic current density increased, while the corrosion potential (E-corr), polarization resistance, charge transfer resistance (R-ct) and pore resistance (R-pore) decreased. The change of these electrochemical parameters indicated that the increase of temperature promoted the dissolution of pyrite by accelerating the electrochemical step and weakening of the porous passive film. EIS studies with different applied potentials at 240 degrees C revealed that both Rct and Rpore decreased with increasing applied potential. As the potential increased to 400 mV, the time constant relating to the porous passive film disappeared. These changes demonstrated that sulfur yield was dependent on the potential, and the sulfur yield approached zero at 400 mV at the temperature of 240 degrees C. The values of Ea indicated that pyrite oxidation kinetics were limited by the rate of electrochemical reaction. |
Indexed By | SCI |
Language | 英语 |
Document Type | 期刊论文 |
Identifier | http://ir.gyig.ac.cn/handle/42920512-1/8750 |
Collection | 地球内部物质高温高压实验室 |
Affiliation | 1.Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, People’s Republic of China 2.University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China |
Recommended Citation GB/T 7714 | Can Cu;Heping Li;Sen Lin;Pan Wang. In Situ Electrochemical Investigation of Acidic Pressure Oxidation of Pyrite at 160-240 degrees C[J]. Journal of The Electrochemical Society,2018,165(5):C289-C294. |
APA | Can Cu;Heping Li;Sen Lin;Pan Wang.(2018).In Situ Electrochemical Investigation of Acidic Pressure Oxidation of Pyrite at 160-240 degrees C.Journal of The Electrochemical Society,165(5),C289-C294. |
MLA | Can Cu;Heping Li;Sen Lin;Pan Wang."In Situ Electrochemical Investigation of Acidic Pressure Oxidation of Pyrite at 160-240 degrees C".Journal of The Electrochemical Society 165.5(2018):C289-C294. |
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In Situ Electrochemi(843KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text |
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