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Solid and liquid metastable phase equilibria in the aqueous quaternary system Li+, Mg2+//SO4 2–, borate-H2O at 273.15 K

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Abstract

The metastable phase equilibria of the Li+, Mg2+//SO4 2–, borate-H2O system at 273.15 K were studied using isothermal evaporation method. The dry-salt phase diagram, water-phase diagram and the physicochemical property diagrams of the system were plotted with the metastable solubility values and physicochemical properties corresponding to density, refractive index, pH value and conductivity. The dry-salt diagram was composed of four crystallizing zones[lithium sulfate hydrate(Li2SO4·H2O), epsomite(MgSO4·7H2O), lithium metaborate octahydrate(LiBO2·8H2O), and hungchaoite(MgB4O7·9H2O)], five univariant curves and two invariant points (Li2SO4·H2O+MgSO4·7H2O+MgB4O7·9H2O and Li2SO4·H2O+LiBO2·8H2O+MgB4O7·9H2O). Li2B4O7 converted into LiBO2 in solution. Comparing the metastable phase diagram at 273.15 K and stable phase diagram at 298.15 K for the system, the crystallized area of Li2SO4·H2O and MgSO4·7H2O became large, whereas, the other phase regions became small. The J(H2O) changes regularly with increasing J(SO4 2‒), and the physicochemical properties change regularly with the concentration of B4O7 2‒ increasing.

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Authors and Affiliations

  1. Tianjin Key Laboratory of Marine Resources and Chemistry, College of Chemical Engineering and Material Sciences, Tianjin University of Science and Technology, Tianjin, 300457, P. R. China

    Lingzong Meng, Yafei Guo & Tianlong Deng

  2. School of Chemistry and Chemical Engineering, Linyi University, Linyi, 276005, P. R. China

    Lingzong Meng, Yafei Guo & Dan Li

  3. CAS Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, P. R. China

    Lingzong Meng & Dan Li

Authors
  1. Lingzong Meng
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  2. Yafei Guo
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  3. Dan Li
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  4. Tianlong Deng
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Corresponding authors

Correspondence to Lingzong Meng or Tianlong Deng.

Additional information

Supported by the National Natural Science Foundation of China(Nos.21406104, U1407113, U1507112 and U1607123), the China Postdoctoral Science Foundation(No.2015M581303), the Yangtze Scholar and Innovative Research Team in Chinese University(No.IRT_17R81) and the Fund of Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lake, Chinese Academy of Sciences in China (No.KLSLRC-KF-13-HX-2).

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Meng, L., Guo, Y., Li, D. et al. Solid and liquid metastable phase equilibria in the aqueous quaternary system Li+, Mg2+//SO4 2–, borate-H2O at 273.15 K. Chem. Res. Chin. Univ. 33, 655–659 (2017). https://doi.org/10.1007/s40242-017-6404-7

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  • DOI: https://doi.org/10.1007/s40242-017-6404-7

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