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Physicochemical modeling of precipitating and dissolving of gypsum in chloride solutions

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Abstract

Physicochemical modeling is used to study the isolation of sulfate ions as α (β)-CaSO4 · 2H2O from aqueous solutions. The equilibrium compositions of liquid, solid, and gas phases of the NA2SO4-CaCl2-CO2-H2O system are calculated at 25°C, CO2 partial pressures of 10−1.53 kPa, CaCl2/Na2SO4 molar ratios of 0.2–3.0, and CaCl2 concentrations from 0.01 to 0.15 mol/kgH2O. The Gibbs energies of formation for α(β)-gypsum were determined from experimental solubility data on the α(β)-gypsum-air-water system by solving the inverse problem of physicochemical modeling. The data obtained are ΔG° f298 (α-CaSO4 · 2H2O) = −1796.446 kJ/mol and G° f298 (β-CaSO4 · 2H2)) = −1797.317 kJ/mol.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia

    N. V. Kochetkova, N. B. Gavrilov, N. P. Dergacheva & V. A. Krenev

  2. Vinogradov Institute of Geochemistry and Analytical Chemistry, Siberian Division, Russian Academy of Sciences, ul. Favorskogo 1A, Irkutsk, 664033, Russia

    K. V. Chudnenko

Authors
  1. N. V. Kochetkova
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  2. N. B. Gavrilov
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  3. N. P. Dergacheva
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  4. K. V. Chudnenko
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  5. V. A. Krenev
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Additional information

Published in Russian in Zhurnal Neorganicheskoi Khimii, 2006, Vol. 51, No. 5, pp. 889–894.

This article was translated by the authors.

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Kochetkova, N.V., Gavrilov, N.B., Dergacheva, N.P. et al. Physicochemical modeling of precipitating and dissolving of gypsum in chloride solutions. Russ. J. Inorg. Chem. 51, 823–828 (2006). https://doi.org/10.1134/S003602360605024X

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  • DOI: https://doi.org/10.1134/S003602360605024X

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