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Solubilities, Densities, and Refractive Indices of the Quaternary System (LiBO2 + NaBO2 + KBO2 + H2O) and Subsystem (NaBO2 + KBO2 + H2O) at 288.15 K and 0.1 MPa

  • PHYSICOCHEMICAL ANALYSIS OF INORGANIC SYSTEMS
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Abstract

Solid-liquid phase equilibria of the quaternary system (LiBO2 + NaBO2 + KBO2 + H2O) and its subsystem are very important for the separation of lithium and boron salts from the salt lake brines. In this paper, the solubilities, densities and refractive indices of the quaternary system (LiBO2 + NaBO2 + KBO2 + H2O) and its subsystem (NaBO2 + KBO2 + H2O) at 288.15 K and 0.1 MPa were determined by the isothermal solution equilibrium method. The experimental results show that the (NaBO2 + KBO2 + H2O) system contains one invariant point and two single salt crystallization zones corresponding to NaBO2·4H2O and KBO2·1.33H2O. The crystallization zone of NaBO2·4H2O was much larger than that of KBO2·1.33H2O. The quaternary system (LiBO2 + NaBO2 + KBO2 + H2O) contains two invariant points, five univariate solubility curves, and four single salt crystallization regions corresponding to LiBO2·8H2O, LiBO2·2H2O, NaBO2·4H2O and KBO2·1.33H2O. LiBO2·8H2O is easily dehydrated and converted to LiBO2·2H2O in the high concentration of KBO2·1.33H2O.

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Funding

The work was supported by the Program of the National Natural Science Foundation of China (22078247, U1707602, and U1507109), Tianjin Key Laboratory of Brine Chemical Engineering Foundation (BCERE201905), and the Yangtze Scholars and Innovative Research Team in University of Ministry of Education of China (IRT-17R81).

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Authors and Affiliations

  1. Research Centre of Modern Analytical Technology, Tianjin University of Science and Technology, 300457, Tianjin, China

    Hai-juan Qin & Shi-qiang Wang

  2. College of Marine and Environmental Sciences, Tianjin University of Science and Technology, 300457, Tianjin, China

    Le Zhang, Sen-jian Han, Shi-qiang Wang & Ya-fei Guo

  3. Key Laboratory of Marine Resource Chemistry and Food Technology (TUST), Ministry of Education, 300457, Tianjin, China

    Sen-jian Han, Shi-qiang Wang & Ya-fei Guo

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  1. Hai-juan Qin
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  2. Le Zhang
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  3. Sen-jian Han
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  4. Shi-qiang Wang
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Correspondence to Sen-jian Han or Shi-qiang Wang.

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Hai-juan Qin, Zhang, L., Han, Sj. et al. Solubilities, Densities, and Refractive Indices of the Quaternary System (LiBO2 + NaBO2 + KBO2 + H2O) and Subsystem (NaBO2 + KBO2 + H2O) at 288.15 K and 0.1 MPa. Russ. J. Inorg. Chem. 67, 691–698 (2022). https://doi.org/10.1134/S0036023622050138

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