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    Towards industrial implementation of glycine-based leach and adsorption technologies for gold-copper ores

    Access Status
    Fulltext not available
    Authors
    Eksteen, Jacques
    Oraby, E.
    Tanda, B.
    Tauetsile, P.
    Bezuidenhout, G.
    Newton, T.
    Trask, F.
    Bryan, I.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Eksteen, J. and Oraby, E. and Tanda, B. and Tauetsile, P. and Bezuidenhout, G. and Newton, T. and Trask, F. et al. 2017. Towards industrial implementation of glycine-based leach and adsorption technologies for gold-copper ores. Canadian Metallurgical Quarterly: pp. 1-9.
    Source Title
    Canadian Metallurgical Quarterly
    DOI
    10.1080/00084433.2017.1391736
    ISSN
    0008-4433
    School
    Dept of Mining Eng & Metallurgical Eng
    URI
    http://hdl.handle.net/20.500.11937/58791
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Canadian Institute of Mining, Metallurgy and Petroleum The technology to selectively leach gold, silver and base metals from ores, concentrates, and wastes, using an alkaline glycine solution, has initiated significant interest in using the new technology in various environments such as in situ, in-place, dump, heap, and vat and agitated tank leaching. It has been shown that glycine acts synergistically with a number of other lixiviants to lower the net consumption of the other lixiviants while allowing low-cost glycine solution recovery. Glycine is a non-toxic, stable, environmentally benign reagent that is available in bulk industrial quantities. It has the ability to dissolve most copper oxide and sulphide minerals, as well as native copper, whilst not interacting with acid-consuming gangue nor dissolving iron and various or ubiquitous gangue elements. It acts synergistically with small amounts of cyanide to leach gold-copper ores at leach rates higher than either glycine or cyanide on their own, while significantly reducing cyanide consumption and eliminating detoxification requirements. The leaching behaviour of various glycine-based systems will be reviewed, followed by the evaluation of the adsorption of gold onto activated carbon. Where the economics merit it, copper can be easily recovered using solvent extraction or sulphide precipitation.

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    • Gold and copper leaching from gold-copper ores and concentrates using a synergistic lixiviant mixture of glycine and cyanide
      Oraby, E.; Eksteen, Jacques; Tanda, B. (2017)
      © 2017 Elsevier B.V.The presence of cyanide soluble copper in the cyanidation of gold-copper ores and concentrates significantly increases the cyanide consumption in order to achieve sufficient gold recovery. In addition, ...
    • Gold leaching in cyanide-starved copper solutions in the presence of glycine
      Oraby, E.; Eksteen, Jacques (2015)
      © 2015 Elsevier B.V. Abstract In the cyanidation of copper-gold ores, the presence of copper minerals can lead to soluble gold losses, the production of weak acid dissociable (WAD) cyanide, as well as a number of operational ...
    • Activated carbon adsorption of gold from cyanide-starved glycine solutions containing copper. Part 1: Isotherms
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      Cyanide-starved alkaline glycine solutions have been shown to have distinct advantages in terms of lower reagent consumption and detoxification needs, or leach rate and recovery, over cyanide- only and glycine-only leach ...
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