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

doi:10.1007/s40242-019-9197-z

Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (6): 1018-1023.doi: 10.1007/s40242-019-9197-z

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

GUO Jian¹, WU Peng¹, LI Yaoyao², ZHANG Min², LI Wenxuan¹, ZHOU Huan^1,2

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

Received:2019-07-23 Revised:2019-09-19 Online:2019-12-01 Published:2019-11-29
Contact: ZHOU Huan E-mail:zhouhuan@tust.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.U1707602, U1407204), the Fund of the Innovative Research Team of Tianjin Municipral Education Commission, China(No.TD12-5004) and the Foundation of Tianjin Key Laboratory of Marine Resources and Chemistry, China(No.201602).

Abstract

Abstract: 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.

Key words: Solid-liquid equilibrium, Phase diagram, Lithium hydroxide, Lithium sulfate, Sodium sulfate

GUO Jian, WU Peng, LI Yaoyao, ZHANG Min, LI Wenxuan, ZHOU Huan. Solid-liquid Phase Equilibria in the Process of Producing Lithium Hydroxide from Lithium Sulfate[J]. Chemical Research in Chinese Universities, 2019, 35(6): 1018-1023.

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

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