Solid鈥揕iquid Metastable Equilibria of the Reciprocal Quaternary System (LiCl + MgCl2 + Li2SO4 + MgSO4 + H2O) at 323.15 K

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• 作者：Lingzong Meng ; Xiaoping Yu ; Dan Li ; Tianlong Deng
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：December 8, 2011
• 年：2011
• 卷：56
• 期：12
• 页码：4627-4632
• 全文大小：806K
• 年卷期：v.56,no.12(December 8, 2011)
• ISSN：1520-5134

文摘

Experimental studies on the metastable solubilities and the physicochemical properties (density, pH value, conductivity, and viscosity) of the aqueous reciprocal quaternary system (LiCl + MgCl₂ + Li₂SO₄ + MgSO₄ + H₂O) at 323.15 K were determined with the isothermal evaporation method. According to the experimental results, the dry-salt phase diagram, water-phase diagram, and the physicochemical properties versus composition diagram were plotted. It was found that there are four invariant points, nine metastable solubility isotherm curves, and six metastable crystallization fields corresponding to lithium chloride monohydrate (LiCl路H₂O), bischofite (MgCl₂路6H₂O), starkeyite (MgSO₄路4H₂O), hexahydrite (MgSO₄路6H₂O), lithium sulfate monohydrate (Li₂SO₄路H₂O), and the double salt lithium-carnallite (LiCl路MgCl₂路7H₂O). No solid solution was found. On the basis of the extended Harvie鈥揥eare (HW) model and its temperature-dependent equation, the values of the Pitzer parameters 尾⁽⁰⁾, 尾⁽¹⁾, 尾⁽²⁾, and C^酶 for Li₂SO₄, MgCl₂, and MgSO₄, the mixed ion-interaction parameters 胃_Li,Mg, 胃_Cl,SO4, 唯_Li,Mg,Cl, 唯_Li,Mg,SO4, 唯_Li,Cl,SO4, and 唯_Mg,Cl,SO4, and the Debye鈥揌眉ckel parameter A^酶 of the quaternary system at 323.15 K were obtained. The calculated solubility of the quaternary system (LiCl + MgCl₂ + Li₂SO₄ + MgSO₄ + H₂O) at 323.15 K was done. A comparison between the calculated and the experimental results shows that the predicted solubility agrees well with the experimental data.