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    Kinetic study of chalcopyrite dissolution with iron(III) chloride in methanesulfonic acid

    Access Status
    Fulltext not available
    Authors
    Hidalgo, T.
    Kuhar, L.
    Beinlich, Andreas
    Putnis, Andrew
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Hidalgo, T. and Kuhar, L. and Beinlich, A. and Putnis, A. 2018. Kinetic study of chalcopyrite dissolution with iron(III) chloride in methanesulfonic acid. Minerals Engineering. 125: pp. 66-74.
    Source Title
    Minerals Engineering
    DOI
    10.1016/j.mineng.2018.05.025
    ISSN
    0892-6875
    School
    The Institute for Geoscience Research (TIGeR)
    URI
    http://hdl.handle.net/20.500.11937/68602
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 The suitability of methanesulfonic acid as a copper lixiviant with ferric chloride as an oxidant was studied by analysing the leaching kinetics and by characterising solid residues from leach tests on a chalcopyrite-rich ore sample. The effects of temperature, initial acidity, ferric-ion concentration and particle size were determined. The leach kinetics were dependent on the temperature and particle size, whereas the acid and ferric concentrations had a minimal impact on the leaching rate within the ranges studied. Although a sulfur layer formed on the solid residue, the reaction mechanism could be modeled with the shrinking-core model with surface chemical-reaction control, which implies that lixiviant flow through the sulfur layer did not control the reaction rate. The apparent activation energy was 101 kJ mol-1as calculated by the Arrhenius and 'time-to-a-given-fraction' methods. The activation parameters of the reaction were an enthalpy (?H++) of 99.4 kJ mol-1, and an entropy (?S++) of -197 J mol-1K-1as calculated by using transition state theory and the Eyring equation.

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