Kinetic model for anodic oxidation of gold in thiosulfate media based on the adsorption of MS2O3− ion-pair
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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.
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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.
| Item Type: | Journal Article |
|---|---|
| Murdoch Affiliation(s): | 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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