Catalog Home Page

The effects of thiosulfate ions on the deposition of cobalt and nickel from sulfate solutions

Nicol, M.J. and Tjandrawan, V. (2014) The effects of thiosulfate ions on the deposition of cobalt and nickel from sulfate solutions. Hydrometallurgy, 150 . pp. 34-40.

[img]
Preview
PDF - Authors' Version
Download (1MB)
Link to Published Version: http://dx.doi.org/10.1016/j.hydromet.2014.09.008
*Subscription may be required

Abstract

A detailed electrochemical study of the effects of thiosulfate ions on the reduction of nickel(II) and cobalt(II) ions in sulfate solutions in the pH range 3 to 4 has been undertaken. Even in the presence of small amounts of thiosulfate, metal sulfides are formed in addition to the metals in a reaction involving reduction of thiosulfate in the presence of these metal ions. In addition, chemical reduction of thiosulfate by metallic cobalt and nickel to form metal sulfides has been established. Reduction of cobalt ions by thiosulfate catalyzed by the metal and/or metal sulfide surface accounts for the excess anodic charge observed during open circuit contact of cobalt metal and/or cobalt sulfide with thiosulfate solutions. It has been shown that thiosulfate is responsible for the formation of black cathodic films of the metal sulfides periodically observed during electrowinning of these metals. A simple method for the control of the peroxide addition to the electrolyte in order to oxidize residual thiosulfate has been devised based on the results of this study.

Publication Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Elsevier BV
Copyright: © 2014 Elsevier B.V.
URI: http://researchrepository.murdoch.edu.au/id/eprint/24219
Item Control Page Item Control Page

Downloads

Downloads per month over past year