Huang, Y.; Jia, Z.; Wang, W.; Yao, J.; Gao, R.; Xu, L.; Zhang, H.; Zhang, Y.; Song, X. Study on Electrochemical Behavior of Oxidized Pyrite in Alkaline Electrolyte. Minerals2023, 13, 1070.
Huang, Y.; Jia, Z.; Wang, W.; Yao, J.; Gao, R.; Xu, L.; Zhang, H.; Zhang, Y.; Song, X. Study on Electrochemical Behavior of Oxidized Pyrite in Alkaline Electrolyte. Minerals 2023, 13, 1070.
Huang, Y.; Jia, Z.; Wang, W.; Yao, J.; Gao, R.; Xu, L.; Zhang, H.; Zhang, Y.; Song, X. Study on Electrochemical Behavior of Oxidized Pyrite in Alkaline Electrolyte. Minerals2023, 13, 1070.
Huang, Y.; Jia, Z.; Wang, W.; Yao, J.; Gao, R.; Xu, L.; Zhang, H.; Zhang, Y.; Song, X. Study on Electrochemical Behavior of Oxidized Pyrite in Alkaline Electrolyte. Minerals 2023, 13, 1070.
Abstract
Nowadays, the world's refractory gold ore production accounts for about 30% of the world's total gold, such gold concentrate leaching rate is low, seriously limiting the efficient use of gold resources. The alkaline preoxidation process can improve the leaching rate of this kind of gold deposit, and has a good development and application prospect. So, it is of great significance to study the oxidation and dissolution behavior of pyrite in alka-line environment. In this paper, the oxidation process of gold-bearing pyrite in alkaline electrolyte was studied by electrochemical techniques, and the oxidation products of pyrite electrode in alkaline solution were characterized by XPS，SEM and other analytical methods. The results show that the optimum pH for pyrite electrochemical oxidation dissolution is about 12, and oxidation potential of pyrite should be above 0.8 V. In that proces of alkaline oxidation dissolution of pyrite, part of S element enters the electrolyte in the form of Sx2-, S2O32-, SO32-and SO42-, and a small amount of S element is adsorbed on the surface of the electrode in the form of S0 and becomes a part of the passive layer. Fe element is adsorbed on the surface of electrode in the form of Fe(OH)2, Fe2O3 and Fe2(SO4)3, which becomes the main component of passivation layer. This study provides a theoretical basis and reference data for the chemical preoxidation treatment of sulfide ores.
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