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本文运用作者提出的从三个对应的二元系的热力学性质预示三元溶液的热力学性质的新对称几何模型,推导得到三元溶液中三个组元的偏摩尔热力学性质的数学表达式。进而将这一结果应用于NaCl-BaCl_2-SrCl_2三元熔盐相图的计算中,得到此三元系的液相析出面及若干等温截面。计算所得结果与实测结果偏差小于5℃,说明此模型在一些熔盐体系中有较好的适用性。
In this paper, we use the new symmetric geometric model proposed by the authors to predict the thermodynamic properties of the ternary solution from the thermodynamic properties of the three binary systems and deduce the mathematical expressions for the partial molar thermodynamic properties of the three components in the ternary solution. Furthermore, this result is applied to the calculation of the phase diagram of NaCl-BaCl_2-SrCl 2 ternary molten salt, and the liquid phase precipitation and some isothermal cross-sections of this ternary system are obtained. The deviation between the calculated and measured data is less than 5 ℃, indicating that this model has good applicability in some molten salt systems.