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Studies on the Stable Phase Equilibria of Quinary System Li+, K+, Mg2+//Cl–, \({{{\text{B}}}_{{\text{4}}}}{\text{O}}_{7}^{{2 - }}\)–H2O at 273 K

  • PHYSICOCHEMICAL ANALYSIS OF INORGANIC SYSTEMS
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Abstract

The isothermal equilibrium method was used to study the stable phase equilibria of the quinary system Li+, K+, Mg2+//Cl‒, \({{{\text{B}}}_{{\text{4}}}}{\text{O}}_{7}^{{2 - }}\)–H2O at 273 K. The solubility data of each component in this system were measured through experiments, and the isothermal phase diagram of this system was also drawn. For the identification of the equilibrium solid phases of the invariant points, X-ray diffraction characterization was used. The projection surface of the stable phase diagram of the quinary system Li+, K+, Mg2+//Cl‒, \({{{\text{B}}}_{{\text{4}}}}{\text{O}}_{7}^{{2 - }}\)‒H2O at 273 K was drawn under the saturation condition of MgB4O7. The simplified dry-salt diagram has carnallite (KCl·MgCl2·6H2O) and lithium carnallite (LiCl·MgCl2·7H2O), and it contains eleven univariate solubility curves, five invariant points and seven crystallization regions corresponding to K2B4O7·4H2O, Li2B4O7·3H2O, KCl, MgCl2·6H2O, and LiCl·2H2O and double salts carnallite (KCl·MgCl2·6H2O) and lithium carnallite (LiCl·MgCl2·7H2O). In the quinary system, by comparing the area of each crystalline phase zone, lithium chloride is a highly soluble salt, therefore, in the solubility diagram, in comparison with magnesium tetraborate, it corresponds to the smallest crystallization area.

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Funding

This project was supported by the National Natural Science Foundation of China (41873071, U1407108) and scientific research and innovation team in Universities of Sichuan Provincial Department of Education (15TD0009).

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Authors and Affiliations

  1. College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology, 610059, Chengdu, Sichuan, China

    Chun-Xia He, Jing-Shu Xu, Shi-Hua Sang, Yun-Yun Gao & Lan-Rong Zhao

  2. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, 610059, Chengdu, Sichuan, China

    Shi-Hua Sang

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  1. Chun-Xia He
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Correspondence to Shi-Hua Sang.

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Chun-Xia He, Xu, JS., Sang, SH. et al. Studies on the Stable Phase Equilibria of Quinary System Li+, K+, Mg2+//Cl–, \({{{\text{B}}}_{{\text{4}}}}{\text{O}}_{7}^{{2 - }}\)–H2O at 273 K. Russ. J. Inorg. Chem. 66, 714–723 (2021). https://doi.org/10.1134/S0036023621050065

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