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

作者：Gow R N^*; Huang H; Young C

来源：Minerals and Metallurgical Processing, 2016, 33(3): 107-115.

DOI：10.19150/mmp.6746

• Enargite
• Arsenic
• Mass-balanced EH-pH diagrams
• Equilibrium calculations

In Part I, Gibbs' phase rule was applied to mass-balanced E pH diagrams for the Cu-As-S-H2O 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 Es-pH diagrams were found to change with stoichiometry such that a particular mineral would predominate if its stoichiometry was used in the calculation. Solutioh 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.

• 出版日期2016-8