Equations of State for NaCl and Ca[Cl.sub.2] Solutions of Arbitrary Concentration at Temperatures 423.15-623.15 K and Pressures up to 5 kbar

Equations of state valid for all possible salt concentrations in solution are obtained for binary fluids [H.sub.2]O-NaCl and [H.sub.2]O-Ca[Cl.sub.2]. The equations are based on the empirical form of the Gibbs free energy for salt solutions of arbitrary concentration, developed earlier. Based on expe...

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Bibliographic Details
Published in:Doklady earth sciences 2018-08, Vol.481 (2), p.1086
Main Authors: Ivanov, M.V, Bushmin, S.A, Aranovich, L.Y
Format: Article
Language:English
Subjects:
Thermodynamics
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Summary:Equations of state valid for all possible salt concentrations in solution are obtained for binary fluids [H.sub.2]O-NaCl and [H.sub.2]O-Ca[Cl.sub.2]. The equations are based on the empirical form of the Gibbs free energy for salt solutions of arbitrary concentration, developed earlier. Based on experimental data on the PVTx properties the obtained earlier thermodynamic description of [H.sub.2]O-NaCl and [H.sub.2]O-Ca[Cl.sub.2] solutions at saturated vapor pressure is extended towards higher pressures. For [H.sub.2]O-NaCl pressures are up to 5 kbar. For [H.sub.2]O-Ca[Cl.sub.2] pressures cover the range of available experimental data up to 0.7 kbar. The equations allow precise calculation of the whole set of thermodynamic parameters of the discussed salt solutions in the temperature ranges 423.15-573.15 K and 423.15-623.15 K, corresponding to low temperature hydrothermal ore deposits, that could be relevant for thermodynamic modeling of ore-bearing fluids at such deposits. DOI: 10.1134/S1028334X18080287
ISSN:1028-334X
DOI:10.1134/S1028334X18080287