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    Kinetic and electrochemical study of silver leaching in thiosulfate solutions using a closed vessel system

    Access Status
    Fulltext not available
    Authors
    Oraby, E.
    Browner, Richard
    Jeffrey, Matthew
    Nikraz, Hamid
    Date
    2009
    Type
    Conference Paper
    
    Metadata
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    Citation
    Oraby, Elsayed and Browner, Richard and Jeffrey, Matthew and Nikraz, Hamid. 2009. Kinetic and electrochemical study of silver leaching in thiosulfate solutions using a closed vessel system, in ICMS Pty Ltd (ed), CA 2009 Conference - Engineering our Future: Are We Up to the Challenge, Sep 27 2009. Perth, Australia: Engineers Australia
    Source Title
    Proceedings of CHEMCA 2009
    Source Conference
    CHEMECA 2009 Conference - Engineering our Future: Are We Up to the Challenge
    ISBN
    978-0858259225
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/22341
    Collection
    • Curtin Research Publications
    Abstract

    Recently, many studies have focused on thiosulfate as one of the promising alternatives to cyanide for gold leaching. However, few studies have evaluated the leaching of silver in thiosulfate solutions. In this study, the leaching of pure silver (99.99% Ag) in thiosulfate solutions containing copper and ammonia is investigated. The effects of various parameters on the silver leaching kinetics were evaluated using a rotating disc technique in open and closed vessels. It was found that the leaching rate of silver in the closed vessel was greater than that obtained in the open vessel. Silver leaching rates were affected positively by increasing ammonia, thiosulfate, and copper(II) concentrations. An electrochemical study showed that increasing thiosulfate and ammonia concentrations has positive effects on the anodic dissolution of silver, however, the presence of thiourea has a negative effect on the anodic dissolution of silver. Finally the study showed that the optimum leaching conditions for silver is: 10 mM Cu(II), 0.8 M NH3 , 0.2 M (S2O3)2-, 30 ºC, 300 rpm, and pH =11.5.

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