NUMERICAL THERMODYNAMIC MODEL OF THE FLUID SYSTEM H2O–LiCl–CaCl2 IN THE TEMPERATURE RANGE FROM –77 TO +50°C

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Abstract

A numerical thermodynamic model of the fluid system H2O–LiCl–CaCl2 is proposed for the temperature range from –77 to +50°C, employing newly derived temperature-dependent parameters for the interactions of Li, Ca, Cl ions and the corresponding solubility product constants within the Pitzer approach. Based on this model, a phase diagram was constructed that includes the calculated eutectic point E'' and peritectic points P1'', P2'', P3'', P4'', P5'' in the ternary system H2O–LiCl–CaCl2, as well as various phase boundaries of crystalline hydrates with their figurative points. The diagram also presents the calculated eutectic point E and peritectic point P for the binary H2O–CaCl2 system, and the eutectic point E' and peritectic points P1', P2', P3' for the binary H2O–LiCl system. The model-predicted eutectic and peritectic characteristics in the binary subsystems, along with the solubilities of solid phases (salt hydrates), show good agreement with experimental data.

About the authors

M. A. Misyura

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: max.misyura94@gmail.com
St. Petersburg, Russia

S. A. Bushmin

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: s.a.bushmin@ipgg.ru
St. Petersburg, Russia

E. V. Savva

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

St. Petersburg, Russia

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