Metastable Phase Equilibria of the Reciprocal Quaternary System Containing Lithium, Sodium, Chloride, and Sulfate Ions at 273.15 K

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• 作者：Shiqiang Wang ; Tianlong Deng
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：October 14, 2010
• 年：2010
• 卷：55
• 期：10
• 页码：4211-4215
• 全文大小：158K
• 年卷期：v.55,no.10(October 14, 2010)
• ISSN：1520-5134

文摘

Experimental studies on the metastable solubilities and the physicochemical properties including density, refractive index, conductivity, and pH values in the reciprocal quaternary system containing lithium, sodium, chloride, and sulfate at 273.15 K were determined with the method of isothermal evaporation. According to the experimental results, the dry-salt phase diagram, the water phase diagram, and the physicochemical properties versus composition were plotted. In the dry-salt phase diagram, there are three invariant points, seven solubility isotherm curves, and five crystallization fields corresponding to sodium chloride, mirabilite, lithium chloride dehydrate (LiCl·2H₂O), lithium sulfate monohydrate, and a double salt (Li₂SO₄·3Na₂SO₄·12H₂O). There were no solid solutions formed in the reciprocal quaternary system. The crystallizing region of mirabilite is the largest, while the region of LiCl·2H₂O is the smallest with the highest concentration and a strong salting-out effect to NaCl and Li₂SO₄·H₂O. When compared with the stable phase diagram at 273.15 K, the area of the phase region of mirabilite is enlarged significantly, while the areas of the phase regions of NaCl, Li₂SO₄·H₂O, and Li₂SO₄·3Na₂SO₄·12H₂O are decreased. The calculated values of densities and refractive index in the quaternary system with empirical equations are in good agreement with the experimental values.