In this paper, in order to guide the lithium salt production from solar ponds in salt lakes, the two ternary systems (Li 2 SO 4 + LiB 5 O 8 + H 2 O) and (LiCl + LiB 5 O 8 + H 2 O) at 298.15 K and 101.325 kPa were studied using the isothermal dissolution experimental method. The solubilities, densities and refractive indices were measured experimentally. From the experimental data, the phase diagrams and the diagrams of physicochemical properties, including density and refractive index, against composition Li 2 SO 4 and LiCl in each ternary system were established. The phase diagrams for the two ternary systems at 298.15 K all have one invariant point, two univariate solubility curves and two crystalline regions corresponding to lithium pentaborate pentahydrate (LiB 5 O 8 ·5H 2 O), lithium sulfate monohydrate (Li 2 SO 4 ·H 2 O, in the former system) and lithium chloride monohydrate (LiCl·H 2 O, in the later system). In addition, both ternary systems are of the hydrate type I, neither double salt nor solid solution were found. The variations of density and refractive index against the concentrations of lithium sulfate in the former system and lithium chloride in the later system are similar. On the basis of empirical formulae for density and refractive index, the calculated data agree well with the experimental values, which indicate that all data obtained are reliable.

中文翻译：

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两种三元体系 (Li2SO4 + LiB5O8 + H2O) 和 (LiCl + LiB5O8 + H2O) 在 298.15 K 和 101.325 kPa 下的溶解度、密度和折射率

在本文中，为了指导盐湖太阳池锂盐的生产，两种三元体系（Li 2 SO 4 + LiB 5 O 8 + H 2 O）和（LiCl + LiB 5 O 8 + H 2 O） ) 在 298.15 K 和 101.325 kPa 下使用等温溶解实验方法进行研究。通过实验测量溶解度、密度和折射率。从实验数据中，建立了相图和物理化学性质图，包括密度和折射率，与每个三元体系中的 Li 2 SO 4 和 LiCl 的组成关系。两个三元体系在298.15 K的相图都有一个不变点、两条单变量溶解度曲线和两个对应于五水五硼酸锂(LiB 5 O 8 ·5H 2 O)、一水硫酸锂(Li 2 SO 4 · H 2 O，在前一个系统中）和氯化锂一水合物（LiCl·H 2 O，在后一个系统中）。此外，两种三元体系均为I型水合物，未发现复盐和固溶体。密度和折射率随前者体系中硫酸锂浓度和后者体系中氯化锂浓度的变化相似。根据密度和折射率的经验公式计算得到的数据与实验值吻合较好，说明得到的所有数据都是可靠的。密度和折射率随前者体系中硫酸锂浓度和后者体系中氯化锂浓度的变化相似。根据密度和折射率的经验公式计算得到的数据与实验值吻合较好，说明得到的所有数据都是可靠的。密度和折射率随前者体系中硫酸锂浓度和后者体系中氯化锂浓度的变化相似。根据密度和折射率的经验公式计算得到的数据与实验值吻合较好，说明得到的所有数据都是可靠的。