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Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores. II. Systems M1, M2//SO 2−4 -H2O (M1, M2 = Fe2+, Fe3+, Cu2+, Zn2+, Pb2+, Ni2+, Co2+, H+) at 25°C

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Abstract

High toxicity of arsenic and selenium makes it important to analyze conditions, under which sulfates, arsenates, and selenites replace sulfides, arsenides, and selenides in the oxidation zones of sulfide ore deposits and in weathered technogenic waste. Published experimental data have been summarized for solubility in ternary systems containing Fe, Cu, Zn, Pb, Ni, and Co sulfates. Due to high solubility of solid phases, the thermodynamic description of solutions was carried out using the Pitzer equations; the necessary parameters were found in the literature or calculated in this article. The applied model was preliminarily verified by experimentally obtained diagrams of solubility. A database was compiled for quantitative thermodynamic modeling of mineral equilibria in most ternary and four-component subsystems of the Fe2+, Cu2+, Zn2+, Ni2+, Co2+//SO 2−4 -H2O system. The lack of experimental data for the systems containing Fe(III) sulfate does not allow calculating necessary parameters of its interaction with other sulfates and conducting calculations in multicomponent systems without simplifications and additional assumptions. Solubility diagrams are considered for the following systems: FeSO4-H2SO4-H2O, NiSO4-H2SO4-H2O, CuSO4-H2SO4-H2O, ZnSO4-H2SO4-H2O, CoSO4-H2SO4-H2O, FeSO4-Fe2(SO4)3-H2O, CoSO4-NiSO4-H2O, ZnSO4NiSO4-H2O, FeSO4-CoSO4-H2O, FeSO4-NiSO4-H2O, FeSO4-CuSO4-H2O, CoSO4-CuSO4-H2O, NiSO4-CuSO4-H2O, and ZnSO4-CoSO4-H2O. For some of these systems, equilibrium phase diagrams are calculated in this article.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia

    M. V. Charykova & V. G. Krivovichev

  2. Department of Mineralogy and Crystallography, Institute for Geoscience, Christian-Albrecht University of Kiel, D-24098, Kiel, Germany

    W. Depmeier

Authors
  1. M. V. Charykova
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  2. V. G. Krivovichev
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  3. W. Depmeier
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Correspondence to M. V. Charykova.

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Original Russian Text © M.V. Charykova, V.G. Krivovichev, W. Depmeier, 2010, published in Zapiski RMO (Proceedings of the Russian Mineralogical Society), 2010, No. 1, pp. 3–18.

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Charykova, M.V., Krivovichev, V.G. & Depmeier, W. Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores. II. Systems M1, M2//SO 2−4 -H2O (M1, M2 = Fe2+, Fe3+, Cu2+, Zn2+, Pb2+, Ni2+, Co2+, H+) at 25°C. Geol. Ore Deposits 52, 701–710 (2010). https://doi.org/10.1134/S1075701510080027

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