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本文利用 CaCl-SrCl_2相图中,固相有一个溶解间断区(miscibility gap)的信息,用亚正规溶液模型计算了该二元系液相和固相的 Gibbs 自由能.运用 Toop方程的变通式即最近 Hillert.M.提出的新的非对称方法,由组成 NaCl-CaCl_2-SrCl_2三元系的二元系热力学性质预示了该三元系液相的 Gibbs 自由能,进而用计算机计算了三元液相中各组元的偏克分子 Gibbs 自由能和活度系数.由三元液相中组元 NaCl,CaCl_2和 SrCl_2的过剩偏克分子 Gibbs 自由能,根据相平衡原理,用计算机计算了该三元系的相图.计算结果对于钠电解的实践和盐湖资源的综合利用有实际意义.亚正规溶液模型和新的非对称方法可望适合于计算一系列有潜在重要性的电荷不对称熔盐体系的相图.如对 Na,Ti,Mg,Ce 电解及熔融氯化脱水制取无水氯化镁有实际意义的 NaCl-CaCl_2-BaCl_2,NaCl-SrCl_2-BaCl_2,NaCl-CaCl_2-MgCl_2,KCl-CaCl_2-MgCl_2,KCl-NaCl-CeCl_3等三元相图.
In this paper, Gibbs free energy of the liquid and solid phase of the binary system was calculated by using the sub-normal solution model, based on the CaCl-SrCl 2 phase diagram, the solid phase has a miscibility gap. Using the Toop equation, That is, the new asymmetric method proposed by Hillert.M. recently predicted the Gibbs free energy of the ternary system liquid phase by the thermodynamic properties of the binary system constituting the NaCl-CaCl_2-SrCl_2 ternary system, and then calculated the ternary The Gibbs free energies and activity coefficients of the molecules in the liquid phase are determined by the Gibbs free energy of excess polarizable molecules of NaCl, CaCl 2 and SrCl 2 in the ternary liquid phase Ternary system.The calculation results have practical significance for the practice of sodium electrolysis and the comprehensive utilization of salt lake resources.The subnormal solution model and the new asymmetric method are expected to be suitable for the calculation of a series of potentially important charge asymmetric melting Salt system, such as NaCl-CaCl_2-BaCl_2, NaCl-SrCl_2-BaCl_2, NaCl-CaCl_2-MgCl_2, KCl-BaCl_2 have practical significance for the electrolysis and melting chlorination dehydration of Na, Ti, Mg, CaCl 2 -MgCl 2, KCl-NaCl-CeCl 3 Ternary phase diagram.