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    Thermal Pre-treatment Techniques for Extraction of Nickel and Cobalt from Western Australia Saprolite Ores

    Pulgarin Saenz JA 2024 Public.pdf (3.695Mb)
    Access Status
    Open access
    Authors
    Pulgarin Saenz, John Alexander
    Date
    2024
    Supervisor
    Eksteen, Jacques
    Oraby, Elsayed
    Beh, Jane
    Bezuidenhout, Rian
    Type
    Thesis
    Award
    MPhil
    
    Metadata
    Show full item record
    Faculty
    Science and Engineering
    School
    WA School of Mines: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/96384
    Collection
    • Curtin Theses
    Abstract

    Laterite deposits, holding 70% of global nickel resources, are economically challenging to process but are gaining interest. Traditional methods like high-pressure acid leaching (HPAL) face difficulties with saprolite ores due to high magnesium silicates. This research explores alternative methods: non-reductive roasting followed by ammonia glycine leaching and reductive roasting to concentrate nickel and cobalt into a ferronickel phase. High goethite samples showed improved leachability, while magnesium silicate-rich samples required high-temperature reductive roasting with controlled CO2 flow and sodium chloride addition for optimal ferronickel recovery. FactSage® simulations highlighted discrepancies between predicted and experimental results due to kinetics and mass transfer constraints.

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