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

被引：23

作者：

Senanayake, G ^{[1
]}

机构：

[1] Murdoch Univ, Dept Mineral Sic & Extract Met, AJ Parker Cooperat Res Ctr Hydromet, Murdoch, WA 6150, Australia

来源：

HYDROMETALLURGY | 2005年 / 76卷 / 3-4期

关键词：

gold oxidation; thiosulfate; ion-pair; adsorption; oxidation mechanism;

D O I：

10.1016/j.hydromet.2004.11.002

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

It has been the general practice amongst researchers to use the molar concentration of thiosulfate salts to be the same as that of S2O32- ions involved in various equilibrium or rate expressions for interpreting gold oxidation kinetics. However, chemical speciation analysis based on the association of thiosultate ion with monovalent cations (ion-pair formation) shows that the concentration of free S2O32- 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 NaS2O3- shows that the rate constant for gold oxidation is 4.2 x 10(-4) Mol m(-2) s(-1). (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：233 / 238

页数：6

共 12 条

[1]

[Anonymous], 1964, SPECIAL PUBLICATION

[2] An electrochemical study of the effect of additives and electrolyte on the dissolution of gold in thiosulfate solutions [J].

Chandra, I ;

Jeffrey, MI .

HYDROMETALLURGY, 2004, 73 (3-4) :305-312

[3]

HOGFELDT E, 1982, IUPAC CHEM DATA SERI, V2

[4]

Ji JX, 2003, HYDROMETALLURGY 2003 PROCEEDINGS, VOLS 1 AND 2, P227

[5]

JIANG T, 1993, HYDROMETALLURGY FUND, P119

[6]

MUIR DM, 2003, MINER PROCESS EXTR M, V113, pC2

[7] ELECTRO-OXIDATION OF THIOSULFATE ION ON GOLD - STUDY BY MEANS OF CYCLIC VOLTAMMETRY AND AUGER-ELECTRON SPECTROSCOPY [J].

PEDRAZA, AM ;

VILLEGAS, I ;

FREUND, PL ;

CHORNIK, B .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1988, 250 (02) :443-449

[8]

Ritchie IM, 2001, CYANIDE: SOCIAL, INDUSTRIAL AND ECONOMIC ASPECTS, P427

[9] Analysis of reaction kinetics, speciation and mechanism of gold leaching and thiosulfate oxidation by ammoniacal copper(II) solutions [J].

Senanayake, G .

HYDROMETALLURGY, 2004, 75 (1-4) :55-75

[10]

SILLEN LG, 1964, SPECIAL PUBLICATION, V26

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