Phase equilibria and calculation of quaternary system LiCl+MgCl2+CaCl2+H2O at 323.2 K

被引：0

作者：

Chen K. ^{[1
]}

Du L. ^{[1
]}

Zeng Y. ^{[1
,2
]}

Ren S. ^{[1
]}

Yu X. ^{[1
,2
]}

机构：

[1] College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Sichuan, Chengdu

[2] Mineral Resources Chemistry Key Laboratory, Sichuan Higher Education Institution, Sichuan, Chengdu

来源：

Huagong Xuebao/CIESC Journal | 2023年 / 74卷 / 05期

关键词：

aqueous solution; lithium salt; phase equilibria; solubility; thermodynamic properties;

D O I：

10.11949/0438-1157.20230115

中图分类号：

学科分类号：

摘要：

The solid-liquid phase equilibria of the quaternary system LiCl+MgCl2+CaCl2+H2O at 323.2 K were studied by the isothermal dissolution method. The density, refractive index and composition of liquid phase were determined experimentally. The phase diagram of the quaternary system at 323.2 K was plotted. The results show that there are two double salts LiCl·MgCl2·7H2O and 2MgCl2·CaCl2·12H2O formed in the quaternary system, belonging to a complex system. The phase diagram of this quaternary system consists of three invariant points, seven univariate curves, five crystallization fields corresponding to MgCl2·6H2O, LiCl·H2O, CaCl2·2H2O, LiCl·MgCl2· 7H2O, 2MgCl2·CaCl2·12H2O. Comparing the phase diagram of the quaternary system at 323.2 K and 298.2 K, it has found that with the increase of temperature, calcium chloride is converted from CaCl2·6H2O and CaCl2·4H2O to CaCl2·2H2O, the crystallization fields of LiCl·MgCl2·7H2O and MgCl2·6H2O decrease and the crystallization fields of LiCl·H2O and 2MgCl2·CaCl2·12H2O increase, which indicates that increasing temperature is beneficial to the precipitation of LiCl·H2O and 2MgCl2·CaCl2·12H2O. The solubility of the quaternary system was calculated by using the PSC model, and the calculated results were basically consistent with the experimental results. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：1896 / 1903

页数：7

共 39 条

[1] Xing K, Zhu Q, Zou X H, Et al., Research on development of industry chain of lithium resources under the background of new energy[J], Geology in China, 50, 2, pp. 395-409, (2023)
[2] Ren S Y, Yu X D, Luo J, Et al., Phase equilibria of aqueous quaternary system Li+ , K+ , NH+4//Cl--H2O at 298.2 K, CIESC Journal, 73, 10, pp. 4335-4344, (2022)
[3] Jiang C X, Chen B L, Zhang D Y, Et al., Progress in isolating lithium resources from China salt lake brine, CIESC Journal, 73, 2, pp. 481-503, (2022)
[4] Gao F, Zheng M P, Nie Z, Et al., Brine lithium resource in the salt lake and advances in its exploitation, Acta Geoscientia Sinica, 32, 4, pp. 483-492, (2011)
[5] Zhong H R, Sun Y, Yang Y Q, Et al., Bauxite (aluminum) -type lithium resources and analysis of its development and utilization potential, Mineral Deposits, 38, 4, pp. 898-916, (2019)
[6] Mineral commodity summaries, (2023)
[7] Nie Z, Wu Q, Ding T, Et al., Research progress on industrialization technology of lithium extraction from salt lake brine in China, Inorganic Chemicals Industry, 54, 10, pp. 1-12, (2022)
[8] Zhou X, Jiang C L, Han J J, Et al., Some problems related to the evaluation of subsurface brine resources in deep-seated aquifers in sedimentary basins, Acta Geoscientia Sinica, 34, 5, pp. 610-616, (2013)
[9] Wu Z M, Deng X C., Salting-out effect and its application in brine separation, Sea-Lake Salt and Chemical Industry, 29, 5, pp. 11-14, (2000)
[10] Zeng Y, Chen P J, Yu X D., Phase equilibria for quaternary system Rb+, Cs+, Mg2+//SO2-4 -H2O at 298.2 K, CIESC Journal, 71, 8, pp. 3460-3468, (2020)

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