Physicochemical modeling of precipitating and dissolving of gypsum in chloride solutions |
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Authors: | N V Kochetkova N B Gavrilov N P Dergacheva K V Chudnenko V A Krenev |
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Institution: | (1) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia;(2) Vinogradov Institute of Geochemistry and Analytical Chemistry, Siberian Division, Russian Academy of Sciences, ul. Favorskogo 1A, Irkutsk, 664033, Russia |
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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.
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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