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    A novel, energy efficient, two stage heap leach process for the extraction and recovery of PGMs

    Access Status
    Fulltext not available
    Authors
    Eksteen, Jacques
    Mwase, J.
    Petersen, J.
    Bradshaw, S.
    Akdogan, G.
    Mpinga, N.
    Snyders, C.
    Date
    2014
    Type
    Conference Paper
    
    Metadata
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    Citation
    Eksteen, J. and Mwase, J. and Petersen, J. and Bradshaw, S. and Akdogan, G. and Mpinga, N. and Snyders, C. 2014. A novel, energy efficient, two stage heap leach process for the extraction and recovery of PGMs, in Proceedings of the International Mineral Processing Congress, Oct 20-24 2014, pp. 1-9. Santa Maria Santiago de Chile, Chile: IMPC.
    Source Title
    IMPC 2014 - 27th International Mineral Processing Congress
    School
    Dept of Mining Eng & Metallurgical Eng
    URI
    http://hdl.handle.net/20.500.11937/19031
    Collection
    • Curtin Research Publications
    Abstract

    The platinum group metals (PGMs) and associated minerals are particularly refractory to most traditional direct leach processes. However, the remoteness of many new ore deposits, socio-political risks, the scarcity of skilled labor and constraints on the availability of water and electrical power makes it increasingly more difficult to implement the conventional mill-float-smelt-refine process routes to extract and refine PGMs in remote areas. This paper discusses a process to extract PGMs from low grade ore and concentrate using a sequential stage heap leach process entailing heap bioleaching and high temperature cyanide leaching, and evaluates the feasibility of implementing a carbon-in-pulp process to recover the PGMs from the pregnant leach solution. The heap bioleaching extracts the base metals in an acidic sulfate medium using a mixed culture of thermophiles. After heap bioleaching the heap is reclaimed, rinsed, agglomerated and restacked for high temperature cyanide leaching where the cyanide liquor is directly heated via solar energy in panels. Palladium, gold and platinum are recovered during the cyanide leaching stage. The pregnant leach solution was evaluated for potential carbon-in-pulp adsorption and subsequent elution similar to gold processing. The kinetics of adsorption and elution compared well with gold adsorption and elution.

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    • The Adsorption and Elution of Platinum Group Metals (Pt, Pd, and Au) from Cyanide Leach Solutions using Activated Carbon
      Snyders, C.; Mpinga, C.; Bradshaw, S.; Akdogan, G.; Eksteen, Jacques (2013)
      This paper investigates the recovery of platinum group metals (PGMs) from a dilute cyanide leach solution containing base metals, in a manner similar to that used for gold extraction in a typical CIP process, and focuses ...
    • The application of activated carbon for the adsorption and elution of platinum group metals from dilute cyanide leach solutions
      Snyders, C.; Mpinga, C.; Bradshaw, S.; Akdogan, G.; Eksteen, Jacques (2013)
      The research presented in this paper investigated the practical aspects of the recovery of platinum group metals (PGMs) from a dilute cyanide leach solution containing base metals, in a manner similar to that used for ...
    • The effect of temperature, cyanide and base metals on the adsorption of Pt, Pd and Au onto activated carbon
      Snyders, C.; Bradshaw, S.; Akdogan, G.; Eksteen, Jacques (2014)
      Leaching of platinum and palladium with alkaline cyanide solutions has been shown to be feasible for a number of leach modes. The platinum and palladium leaching will typically take place at elevated temperatures, which ...
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