Experimental study of pyrite-galena mixed potential in a flowing system and its applied implications

被引：12

作者：

Liu, Qingyou ^{[1
]}

Li, Heping ^{[1
]}

Zhou, Li ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Geochem, Lab Study Earths Interior & Geofluids, Guiyang 550002, Peoples R China

来源：

HYDROMETALLURGY | 2009年 / 96卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

Unstrained pyrite; Strained pyrite; Galena; Galvanic interaction; Flowing system; Corrosion current density; Mixed potential; GALVANIC INTERACTION; CHALCOPYRITE; FLOTATION; OXIDATION; IONS; SULFIDES; DISSOLUTION; SPHALERITE; SEPARATION; MINERALS;

D O I：

10.1016/j.hydromet.2008.09.002

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A three-electrode system was adopted to investigate the corrosion current density and mixed potential of unstrained pyrite-galena and strained pyrite-galena galvanic cells in a flowing system. The results showed that when present in the same solution, strained pyrite produces a lower electrode potential than that of the galena electrode because of its strain energy: moreover, increasing the sodium sulfate solution concentration causes only slight fluctuations in the corrosion current density and mixed potential, while these values clearly increased with increasing ferric sulfate solution concentrations. In addition, for the sodium sulfate solution or ferric sulfate electrolyte, the faster the flow rate, the bigger the corrosion current density and the more positive the mixed potential of the galvanic cell. The experimental results are significant for hydrometallurgy and for controlling environmental pollution in mining activities. By using the galvanic model, mixed potential theory and the Butler-Volmer equation, the experimental results were explained theoretically. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：132 / 139

页数：8

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