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Статья
2021

Solid–Liquid Phase Equilibria in the Quaternary System Containing Lithium, Magnesium, Chloride, and Borate at 298.15 K


Zhi-wei ZhengZhi-wei Zheng, Peng GuPeng Gu, Shi-qiang WangShi-qiang Wang, Ya-fei GuoYa-fei Guo, Tian-long DengTian-long Deng
Российский журнал физической химии А
https://doi.org/10.1134/S0036024421100344
Abstract / Full Text

Solubility data for the quaternary system (LiCl + MgCl2 + Li2B4O7 + MgB4O7 + H2O) is very important for the separation of lithium and boron from the salt lake brines of Qaidam Basin. The solubilities and physicochemical properties including density, refractive index and pH value of the quaternary system (LiCl + MgCl2 + Li2B4O7 + MgB4O7 + H2O) at T = 298.15 K and p = 0.1 MPa were investigated experimentally with the method of isothermal dissolution equilibrium. In the phase diagram of the quaternary system at 298.15 K, there are three invariant points, seven univariant isotherm dissolution curves, and five crystallization regions corresponding to LiCl⋅H2O, MgCl2⋅6H2O, Li2B4O7⋅3H2O, MgB4O7⋅9H2O and double salt LiCl⋅MgCl2⋅7H2O, respectively. The solution density and refractive index of the quaternary system at 298.15 K changes regularly with the increasing of Mg2+ concentration.

Author information
  • College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, 300457, Tianjin, P. R. ChinaZhi-wei Zheng, Peng Gu, Shi-qiang Wang, Ya-fei Guo & Tian-long Deng
  • Key Laboratory of Marine Resource Chemistry and Food Technology (TUST), Ministry of Education, 300457, Tianjin, P. R. ChinaShi-qiang Wang, Ya-fei Guo & Tian-long Deng
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