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Solubilities, Densities, and Refractive Indices of the Quaternary System (KCl + MgCl2 + K2B4O7 + MgB4O7 + H2O)

  • CHEMICAL THERMODYNAMICS AND THERMOCHEMISTRY
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Abstract

Solubility data for the quaternary system (KCl + MgCl2 + K2B4O7 + MgB4O7 + H2O) is very important for the separation of potassium and boron from the salt lake brines in Qaidam Basin. The solubilities and physicochemical properties including density and refractive index of the quaternary system (KCl + MgCl2 + K2B4O7 + MgB4O7 + H2O) at 318.15 K and 0.1 MPa were investigated experimentally with the method of isothermal dissolution equilibrium. In the phase diagrams of this quaternary system at 318.15 K, there are three invariant points, seven univariant isotherm dissolution curves, and five crystallization regions corresponding to KCl, MgCl2⋅6H2O, K2B4O7⋅4H2O, Mg2B6O11⋅15H2O and double salt KCl⋅MgCl2⋅6H2O, respectively. The solution density and refractive index of the quaternary system at 318.15 K change regularly with the increasing of Mg2+ concentration.

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ACKNOWLEDGMENTS

The work was supported by the Program of the National Natural Science Foundation of China (22078247, U1707602, and U1507109), the Natural Science Foundation of Hebei Province (B2021202058), the Natural Science Foundation of Tianjin (17JCYBJC19500), and the Yangtze Scholars and Innovative Research Team in Chinese University (IRT_17R81) are greatly acknowledged.

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Authors and Affiliations

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

    Jia-tong Wu, Le Zhang, Dong-chan Li, Ya-fei Guo & Shi-qiang Wang

  2. School of Chemical Engineering and Technology, Hebei University of Technology, 300130, Tianjin, China

    Dong-chan Li

  3. Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin University of Science and Technology, 300457, Tianjin, China

    Ya-fei Guo & Shi-qiang Wang

Authors
  1. Jia-tong Wu
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  2. Le Zhang
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  3. Dong-chan Li
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  4. Ya-fei Guo
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  5. Shi-qiang Wang
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Correspondence to Dong-chan Li or Shi-qiang Wang.

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Wu, Jt., Zhang, L., Li, Dc. et al. Solubilities, Densities, and Refractive Indices of the Quaternary System (KCl + MgCl2 + K2B4O7 + MgB4O7 + H2O). Russ. J. Phys. Chem. 95 (Suppl 2), S217–S221 (2021). https://doi.org/10.1134/S0036024421150243

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