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本文以NaCl-CaCl_2-SrCl_2三元计算相图作为“予知图形”采用高灵敏度的微型差热分析仪(简称MDTA)测定了这个三元相图,并注意到盐的过冷对测量的影响。该三元系是三元低共晶系,低共晶点E的组成为41.9mol％NaCl,40.8mol％CaCl_2,18.1mol％SrCl_2,温度为744K。其中CaCl_2-SrCl_2一侧单变线的起点K对应的温度为823K,液相组成为24.8mol％NaCl,50.1mol％CaCl_2,25.1mol％SrCl_2。这个实测三元相图对了解熔盐电解质的性能和盐湖资源的综合利用有实际意义。同时为检验电荷不对称三元熔盐系相图计算的热力学模型的可靠性提供了例证。
In this paper, the ternary phase diagram of NaCl-CaCl_2-SrCl_2 ternary calculation was used as the “predictive pattern”. The ternary phase diagram was measured by using a high sensitivity micro-differential thermal analyzer (MDTA), and the influence of salt over-cooling on the measurement was observed. The ternary system is ternary low eutectic, the composition of the low eutectic point E is 41.9mol% NaCl, 40.8mol% CaCl_2, 18.1mol% SrCl_2, the temperature is 744K. The temperature at the start point K of the unidirectional line on the CaCl 2 -SrCl 2 side is 823K and the liquid phase is 24.8mol% NaCl, 50.1mol% CaCl 2 and 25.1mol% SrCl 2. This ternary phase diagram has practical significance for understanding the properties of molten salt electrolytes and the comprehensive utilization of salt lake resources. At the same time, this paper provides an example for verifying the reliability of the thermodynamic model for calculating the asymmetric ternary molten salt phase diagram of charge.