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    Effect of minerals on the stability of gold in copper ammoniacal thiosulfate solutions - The role of copper, silver and polythionates

    Access Status
    Fulltext not available
    Authors
    Staunton, William
    Aylmore, M.
    Muir, D.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Aylmore, M. and Muir, D. and Staunton, W. 2014. Effect of minerals on the stability of gold in copper ammoniacal thiosulfate solutions - The role of copper, silver and polythionates. Hydrometallurgy. 143: pp. 12-22.
    Source Title
    Hydrometallurgy
    DOI
    10.1016/j.hydromet.2013.12.001
    ISSN
    0304386X
    URI
    http://hdl.handle.net/20.500.11937/25919
    Collection
    • Curtin Research Publications
    Abstract

    The effect of some typical oxide and sulide minerals, as well as activated carbon, on synthetic gold thiosulfate leach solutions was examined. The presences of pyrite and goethite in a synthetic ore slurry have a significant effect on the adsorption and stability of gold, silver, copper and polythionates in ammoniacal thiosulfate solutions. Adsorption of tetrathionate in particular leads to significant gold and silver losses. The adsorption of copper on mineral surfaces inhibited gold and silver losses, even in the presence of tetrathionate. However, goethite was found to strongly adsorb copper(II). It is concluded that gold extraction from natural ores is lower than that obtained with cyanide, partly as a result of sorption or precipitation reactions. Furthermore, the presence of silver in solution catalyses the precipitation of a mixed copper/silver/gold sulfide in ammoniacal thiosulfate solutions containing tetrathionate.

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