Utility of mass-balanced EH-pH diagrams II: Stoichiometry of Cu-As-S-H2O system

In Part I, Gibbs’ phase rule was applied to mass-balanced E H -pH diagrams for the Cu-As-S-H 2 O system. The diagrams were generated using the stoichiometry of enargite as a basis. In this study, the calculations were expanded to cover the stoichiometries of three other Cu-As-S minerals — tennantite...

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Bibliographic Details
Published in:Minerals & Metallurgical Processing 2016-08, Vol.33 (3), p.107-115
Main Authors: Gow, R. N., Huang, H., Young, C.
Format: Article
Language:English
Subjects:
Engineering
Materials Engineering
Metallic Materials
Mineral Resources
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Summary:In Part I, Gibbs’ phase rule was applied to mass-balanced E H -pH diagrams for the Cu-As-S-H 2 O system. The diagrams were generated using the stoichiometry of enargite as a basis. In this study, the calculations were expanded to cover the stoichiometries of three other Cu-As-S minerals — tennantite, sinnerite and lautite — and compared with enargite. Stability regions within the resulting E H -pH diagrams were found to change with stoichiometry such that a particular mineral would predominate if its stoichiometry was used in the calculation. Solution speciation was also found to vary, with thioarsenate being the best example. This stoichiometric effect helps to explain results reported in the literature and would be difficult to realize if it were not for mass-balanced calculations.
ISSN:0747-9182
2524-3470
DOI:10.19150/mmp.6746