Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9632616 | Hydrometallurgy | 2005 | 6 Pages |
Abstract
It has been the general practice amongst researchers to use the molar concentration of thiosulfate salts to be the same as that of S2O32â 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 S2O32â ions is lower than that of associated MS2O3â 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 NaS2O3â shows that the rate constant for gold oxidation is 4.2Ã10â4 mol mâ2 sâ1.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Gamini Senanayake,