Solid and Liquid Metastable Phase Equilibria in the Aqueous Quaternary System Li+, Mg2+//SO42-, Borate-H2O at 273.15 K

doi:10.1007/s40242-017-6404-7

Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (4): 655-659.doi: 10.1007/s40242-017-6404-7

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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

MENG Lingzong^1,2,3, GUO Yafei^1,2, LI Dan^2,3, DENG Tianlong¹

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;
2. School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, P. R. China;
3. CAS Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, P. R. China

Received:2016-10-08 Revised:2016-11-21 Online:2017-08-01 Published:2017-01-12
Contact: MENG Lingzong, DENG Tianlong E-mail:menglingzong@lyu.edu.cn;tldeng@tust.edu.cn
Supported by:
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）.

Abstract

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.

Key words: Metastable phase equilibrium, Phase diagram, Solubility, Lithium metaborate octahydrate, Hungchaoite

MENG Lingzong, GUO Yafei, LI Dan, DENG Tianlong. Solid and Liquid Metastable Phase Equilibria in the Aqueous Quaternary System Li⁺, Mg²⁺//SO₄^2-, Borate-H₂O at 273.15 K[J]. Chemical Research in Chinese Universities, 2017, 33(4): 655-659.

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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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