Solid-liquid Phase Equilibria in the Process of Producing Lithium Hydroxide from Lithium Sulfate

  • Jian Guo
  • Peng Wu
  • Yaoyao Li
  • Min Zhang
  • Wenxuan Li
  • Huan ZhouEmail author


The solid-liquid phase equilibria in the process of producing lithium hydroxide from lithium sulfate at 283.15, 298.15 and 323.15 K were studied via the isothermal solubility equilibrium method, and the solid species, phase diagrams, solution densities and pH were determined. The results show that four solid species of Na2SO4·10H2O, Na2SO4·2.5H2O, Na2SO4 and LiOH·H2O occurred in the system, among them, Na2SO4·2.5H2O was a new solid species not reported in the open literature, which was determined via chemical analysis, Karl Fischer water titration, X-ray diffraction(XRD), thermogravimetic analysis(TG) and differential scanning calorimetry(DSC) testing. Based on the SLE data, one systemic process to produce LiOH·H2O from Li2SO4·H2O was proposed including two crystallization steps at lower and higher temperatures.


Solid-liquid equilibrium Phase diagram Lithium hydroxide Lithium sulfate Sodium sulfate 


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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH 2019

Authors and Affiliations

  • Jian Guo
    • 1
  • Peng Wu
    • 1
  • Yaoyao Li
    • 2
  • Min Zhang
    • 2
  • Wenxuan Li
    • 1
  • Huan Zhou
    • 1
    • 2
    Email author
  1. 1.College of Marine and Environmental SciencesTianjin University of Science and TechnologyTianjinP. R. China
  2. 2.College of Chemical Engineering and Materials Science, Tianjin Key Laboratory of Marine Resources and ChemistryTianjin University of Science and TechnologyTianjinP. R. China

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