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Chemical Research in Chinese Universities

, Volume 34, Issue 5, pp 798–802 | Cite as

Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl+MgCl2+Li2SO4+MgSO4+H2O at 348.15 K and 0.1 MPa

  • Xiaoping Yu
  • Qin Wang
  • Yafei Guo
  • Tianlong Deng
Article

Abstract

The metastable solubilities and the physicochemical properties including density and pH of the reciprocal quaternary system(LiCl+MgCl2+Li2SO4+MgSO4+H2O) at 348.15 K and 0.1 MPa were determined using the isother-mal evaporation method. The dry-salt diagram and water-phase diagram were plotted based on the experimental data. There are five invariant points, eleven univariant curves, and seven crystallization zones corresponding to hexahy-drite, tetrahydrite, kieserite, bischofite, lithium sulfate monohydrate, lithium chloride monohydrate and lithium car-nallite. Comparison between the stable and metastable diagrams at 348.15 K indicates that the metastable phenome-non of magnesium sulfate is obvious, and the crystallization regions of hexahydrite and tetrahydrite disappear in the stable phase diagram. A comparison of the metastable dry-salt phase diagrams at 308.15, 323.15 and 348.15 K shows that with the increasing of temperature the epsomite crystallization zone disappears from the dry-salt phase diagram of 303.15 K, and a new kieserite crystallization zone is presented at 348.15 K. The density and pH in the metastable equilibrium solution present regular change with the increasing of Jänecke index J(2Li+), and the calculated densities using the empirical equation agree well with the experimental values.

Keywords

Phase equilibrium Phase diagram Solubility Quaternary system Lithium salt 

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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiaoping Yu
    • 1
    • 2
  • Qin Wang
    • 1
  • Yafei Guo
    • 1
    • 2
  • Tianlong Deng
    • 1
  1. 1.Tianjin Key Laboratory of Marine Resources and Chemistry, College of Chemical Engineering and Materials ScienceTianjin University of Science and TechnologyTianjinP. R. China
  2. 2.College of Chemistry and Materials ScienceNorthwest UniversityXi’anP. R. China

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