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Kinetic model for anodic oxidation of gold in thiosulfate media based on the adsorption of MS2O3− ion-pair

Senanayake, G. (2005) Kinetic model for anodic oxidation of gold in thiosulfate media based on the adsorption of MS2O3− ion-pair. Hydrometallurgy, 76 (3-4). pp. 233-238.

Link to Published Version: http://dx.doi.org/10.1016/j.hydromet.2004.11.002
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Abstract

It has been the general practice amongst researchers to use the molar concentration of thiosulfate salts to be the same as that of S2O 3 2- ions involved in various equilibrium or rate expressions for interpreting gold oxidation kinetics. However, chemical speciation analysis based on the association of thiosulfate ion with monovalent cations (ion-pair formation) shows that the concentration of free S 2O3 2- ions is lower than that of associated MS2O3 - ions (M=Na, K, NH4). Analysis of literature data on electrochemical oxidation rates of gold in non-ammoniacal alkaline sodium thiosulfate solutions based on the adsorption of NaS 2O3 - shows that the rate constant for gold oxidation is 4.2×10-4 mol m-2 s-1.

Publication Type: Journal Article
Murdoch Affiliation: Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions
Publisher: Elsevier BV
Copyright: © 2004 Elsevier B.V.
URI: http://researchrepository.murdoch.edu.au/id/eprint/16378
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