Stable phase equilibria of quaternary system NH4Cl-CaCl2-SrCl2-H2O at 298.2 K

被引：0
作者：
Feng S. [1 ]
Yu X.-D. [1 ]
Luo J. [1 ]
Zheng Q.-F. [1 ]
Liu M. [1 ]
机构：
[1] College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu
来源：
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2023年 / 37卷 / 02期
关键词：
hydrate; phase equilibria; solid solution; solubility; thermodynamic properties;
D O I：
10.3969/j.issn.1003-9015.2023.02.005
中图分类号：
学科分类号：
摘要：
In order to obtain crystallization forms of salts containing ammonium, calcium, strontium, and chloride at 298.2 K, stable phase equilibria of the quaternary system NH4Cl-CaCl2-SrCl2-H2O at T=298.2 K was studied using an isothermal dissolution equilibrium method. Solubilities, densities, and refractive indices of the system were determined experimentally. Space diagram, stable phase diagram, and diagrams of density vs composition and refractive index vs composition were obtained based on the measured data. The results show that there are three invariant points, seven isothermal dissolutions, and five crystallization regions in the stable phase diagram of the system NH4Cl-CaCl2-SrCl2-H2O. The system forms solid solution [(Ca, Sr)Cl2]·6H2O and [(Sr, Ca)Cl2]·6H2O and is a complex type. The five crystallization region areas were in the order of NH4Cl>SrCl2·6H2O>[(Ca, Sr)Cl2]·6H2O>[(Sr, Ca)Cl2]·6H2O>CaCl2·6H2O, and the crystallization region of SrCl2·6H2O was larger than that of solid solution. Therefore, SrCl2·6H2O can be separated from the mixed solution by avoiding crystallization in the solid solution crystallization regions during evaporation. © 2023 Zhejiang University. All rights reserved.
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页码：194 / 201
页数：7
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