Measurements and calculations of solid-liquid equilibria in quaternary system LiCl-MgCl2-CaCl2-H2O at 298 K

CUI Ruizhi; LI Wu; DONG Yaping; SANG Shihua

doi:10.11949/j.issn.0438-1157.20180383

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Measurements and calculations of solid-liquid equilibria in quaternary system LiCl-MgCl₂-CaCl₂-H₂O at 298 K

更新时间：2025-12-10

- Measurements and calculations of solid-liquid equilibria in quaternary system LiCl-MgCl₂-CaCl₂-H₂O at 298 K
- CIESC Journal Issue 10, Pages: 4148-4155(2018)
- 作者机构：
  
  1. 中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室,青海,西宁,810008
  2. 青海省盐湖资源化学重点实验室,青海,西宁,810008
  3. 青海省盐湖资源综合利用工程技术中心,青海,西宁,810008
  4. 成都理工大学材料与化学化工学院,四川,成都,610059
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180383
  CLC： 642
- Online First：05 October 2018，
  
  Published：05 October 2018
- 稿件说明：
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CUI Ruizhi, LI Wu, DONG Yaping, et al. Measurements and calculations of solid-liquid equilibria in quaternary system LiCl-MgCl₂-CaCl₂-H₂O at 298 K[J]. CIESC Journal, 2018, (10): 4148-4155. DOI: 10.11949/j.issn.0438-1157.20180383.
DOI：

CUI Ruizhi, LI Wu, DONG Yaping, et al. Measurements and calculations of solid-liquid equilibria in quaternary system LiCl-MgCl₂-CaCl₂-H₂O at 298 K[J]. CIESC Journal, 2018, (10): 4148-4155. DOI: 10.11949/j.issn.0438-1157.20180383. DOI：

摘要

采用等温溶解平衡法测定了四元体系LiCl-MgCl2-CaCl2-H2O在298 K下的溶解度，由此绘制了相应的相图和水含量图。实验结果表明，该体系在298 K时有三种复盐生成，无固溶体生成。其相图中含有五个共饱点，十一条单变量曲线以及七个平衡固相结晶区，分别为四个单盐结晶区（CaCl2·6H2O、CaCl2·4H2O、MgCl2·6H2O和LiCl·H2O）以及三个复盐结晶区（LiCl·MgCl2·7H2O、LiCl·CaCl2·5H2O和2MgCl2·CaCl2·12H2O）。运用Pitzer模型，采用文献中报道的参数对该四元体系进行了298 K条件下的溶解度计算。对比发现，计算结果与实验数据基本吻合。

Abstract

Solid-liquid equilibria in the quaternary system LiCl-MgCl2-CaCl2-H2O at 298 K were studied by the method of isothermal solution saturation method. Using the experimental data

the phase diagram and the relevant water diagram of the quaternary system were obtained. The results show that the phase diagram of the quaternary system consists of seven crystallization fields

eleven univariant curves

and five invariant points. In addition to four simple salts CaCl2·6H2O

CaCl2·4H2O

MgCl2·6H2O and LiCl·H2O

the three double salts LiCl·MgCl2·7H2O

LiCl·CaCl2·5H2O and 2MgCl2·CaCl2·12H2O also crystallizes from the saturated solutions. The crystallized area of single salt MgCl2·6H2O is the largest because of its smallest solubility. The solubility of the quaternary system at 298 K was calculated by Pitzer model using the parameters reported in the literature. The calculated results are basically consistent with the experimental data.

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