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Ren Kaiwu, Song Pengsheng. A Study on Equilibrium Solubilities in the Quaternary Reciprocal System of Li+, K+/Cr-,at 50℃ and 75℃[J]. Chinese Journal of Applied Chemistry,
;1994, 11(1): 7-11.
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The eqtiibrium solubilities of title quaternary system were studied at 50,75℃ by the isothernlal method. The phase diagrams of the system consist of seven solubility branch-es and have five crvstallization fields:KLiSO4, Li2SO4·H2O, KCl,K2SO4, and LiCl·H2O.The first one is the largest. Three invariant points exist in the system:LiCl·H2O+KCl+Li2SO4·H2O,KCl+K2SO4+KLiSO4,and KCl+KLiSO4+Li2SO4·H2O. The first one is acongrLient eutonic point, and the others are incongruent. The ion interaction pararneters of the Pitzer model for rnixed electrolyte solution at 50℃ and 75℃ were obtained by fitting the determined solubility data. The water activity of the equilibrium liquid, and the solubility product of salts were calculated. The empirical eqtiations of density and refractive index of the solution in relationto to its composition were used to correlate the data. The results arein good agreement.
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Keywords:
- lithitim salt,
- potassium salt,
- chloride,
- sulphate
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