A Study of the Phase Equilibrium for Quinary System Li+, Na+, K+//CO32-, Cl--H2O at 298.15 K

Abstract

Abstract: Zabuye Saline Lake, Tibet, P. R. China, is unrivalled in the world for its high concentration of chloride, sulfate, carbonate and borate of lithium, sodium and potassium. In accordance with the composition of the brine, the phase equilibrium of quinary system Li⁺, Na⁺, K⁺//CO₃^2-, Cl^--H₂O at 298.15 K were studied by isothermal method, from which the phase diagram (stereo-diagram and projected-diagram which were saturated with Li₂CO₃) were drawn. The phase diagram of this quinary system consists of seven crystallization fields, thirteen univariant curves and four invariant points. Seven crystallization fields correspond to six single-salt crystallization fields and one complex salt crystallization, that are LiCl·H₂O, NaCl, K₂Cl₂, Li₂CO₃, K₂CO₃·3/2H₂O, Na₂CO₃·10H₂O and complex salt NaKCO₃·6H₂O. The crystallization region of trona (Na₂CO₃·NaHCO₃·2H₂O) or solid solution is not found in this quinary system. The composition of equilibrium solid phase for four invariant points (K₁, K₂, K₃, K₄) is as follows: Li₂CO₃+NaKCO₃·6H₂O+Na₂CO₃·10H₂O+KCl for K₁, Li₂CO₃+NaKCO₃·6H₂O+K₂CO₃·3/2H₂O+KCl for K₂, Li₂CO₃+NaCl+KCl+LiCl·H₂O for K₃, Li₂CO₃+NaCl+Na₂CO₃·10H₂O+KCl for K₄, respectively.

Key words: Phase equilibrium, Quinary system, Lithium salt, Potassium salt

CLC Number:

O642.5

TrendMD:

ZENG Ying, YIN Hui-An, TANG Ming-Lin, FENG Xiao-Xiang . A Study of the Phase Equilibrium for Quinary System Li⁺, Na⁺, K⁺//CO₃^2-, Cl^--H₂O at 298.15 K[J]. Chem. J. Chinese Universities, 2003, 24(6): 968.

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A Study of the Phase Equilibrium for Quinary System Li⁺, Na⁺, K⁺//CO₃^2-, Cl^--H₂O at 298.15 K

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