Measurement of Solid-liquid Equilibria in Quaternary System Li+, K+//SO42-, B4O72--H2O at 288 K

doi:10.1007/s40242-016-5308-2

Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (1): 90-94.doi: 10.1007/s40242-016-5308-2

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Measurement of Solid-liquid Equilibria in Quaternary System Li⁺, K⁺//SO₄^2-, B₄O₇^2--H₂O at 288 K

SANG Shihua^1,2, FU Chao^1,2, ZHANG Tingting^1,2, ZHANG Xueping¹, XIAO Longjun¹

1. College of Materials and Chemistry & Chemical Engineering, Chengdu 610059, P. R. China;
2. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, P. R. China

Received:2015-07-30 Revised:2015-09-10 Online:2016-02-01 Published:2015-11-13
Contact: SANG Shihua E-mail:sangshihua@sina.com.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.U1407108, 41373062) and the Project of the Scientific Research and Innovation Team in Universities of Sichuan Provincial Department of Education, China(No.15TD0009).

Abstract

Abstract:

In order to utilize the brine resources in China, the solid-liquid equilibria in quaternary system Li⁺, K⁺//SO₄^2-, B₄O₇^2--H₂O at 288 K was studied by the isothermal solution equilibrium method. Solubilities and densities of solutions were determined experimentally. According to the experimental data, the equilibrium phase diagrams, density-composition diagram and corresponding water content diagram of the quaternary system were plotted. Double salt KLiSO₄ was found in the reciprocal quaternary system Li⁺, K⁺//SO₄^2-, B₄O₇^2--H₂O at 288 K. The quaternary system has three invariant points, seven univariant curves and five fields of crystallization. The five crystallization regions correspond to Li₂B₄O₇·3H₂O, Li₂SO₄·H₂O, K₂B₄O₇·4H₂O, K₂SO₄ and KLiSO₄, respectively. The crystallization field of salt Li₂B₄O₇·3H₂O is the largest, whereas that of Li₂SO₄·H₂O is the smallest. The experimental results show that Li₂SO₄·H₂O has a strong salting-out effect on other salts.

Key words: Solid-liquid equilibria, Borate, Double salt, Salting-out effect

SANG Shihua, FU Chao, ZHANG Tingting, ZHANG Xueping, XIAO Longjun. Measurement of Solid-liquid Equilibria in Quaternary System Li⁺, K⁺//SO₄^2-, B₄O₇^2--H₂O at 288 K[J]. Chemical Research in Chinese Universities, 2016, 32(1): 90-94.

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Measurement of Solid-liquid Equilibria in Quaternary System Li⁺, K⁺//SO₄^2-, B₄O₇^2--H₂O at 288 K

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