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    An Electrochemical Study of the Dissolution of Pure Gold And Gold-Silver Alloys in Thiosulfate Leach Solutions

    Access Status
    Fulltext not available
    Authors
    Oraby, El-Sayed
    Jeffrey, Matthew
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Oraby, E. and Jeffrey, M. 2010. An Electrochemical Study of the Dissolution of Pure Gold And Gold-Silver Alloys in Thiosulfate Leach Solutions. ECS Transactions. 28 (6): pp. 237-248.
    Source Title
    ECS Transactions
    DOI
    10.1149/1.3367917
    ISSN
    1938-5862
    URI
    http://hdl.handle.net/20.500.11937/36507
    Collection
    • Curtin Research Publications
    Abstract

    A fundamental electrochemical study of gold and gold/silver alloys in thiosulfate solutions showed that although the oxidation is a complex process, there was no selective dissolution of either gold or silver from the alloys during oxidation. The presence of copper and thiourea catalyses the oxidation of the alloys, resulting in good leaching for thiosulfate systems when utilising either of these species. Surprisingly for copper containing solutions, the oxidation rate is largely independent of potential, and is higher for pure gold than for the 4% Ag and 8% Ag alloys. For thiourea containing solutions, the rate of alloy oxidation increases with increases in the silver content of the alloy. In the absence of copper or thiourea, the only alloy which showed appreciable oxidation was 50% Au / 50%Ag, although the rate of oxidation did increase with an increase in silver content from 0 to 50%.

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