Measurements and simulation for aqueous quaternary system MgCl2-SrCl2-AlCl3-H2O at 298.2 K

ZHENG Qiufeng; LUO Jun; CHEN Shuai; CHEN Niancu; YU Xudong; ZENG Ying

doi:10.11949/0438-1157.20200420

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Measurements and simulation for aqueous quaternary system MgCl₂-SrCl₂-AlCl₃-H₂O at 298.2 K

Thermodynamics | 更新时间：2026-07-24

- Measurements and simulation for aqueous quaternary system MgCl₂-SrCl₂-AlCl₃-H₂O at 298.2 K
- CIESC Journal Vol. 71, Issue 12, Pages: 5443-5451(2020)
- 作者机构：
  
  1.成都理工大学材料与化学化工学院，四川成都 610059
  2.四川省攀西战略矿产资源综合利用协同创新中心，四川成都 610059
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20200420
  CLC： O 642.4
- Received：22 April 2020，
  
  Revised：2020-06-30，
  
  Online First：17 December 2020，
  
  Published：05 December 2020
- 稿件说明：
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郑秋风, 罗军, 陈帅, 陈念粗, 于旭东, 曾英. 298.2 K四元体系MgCl₂-SrCl₂-AlCl₃-H₂O相平衡实验及溶解度计算[J]. 化工学报, 2020, 71(12): 5443-5451 DOI: 10.11949/0438-1157.20200420.

ZHENG Qiufeng, LUO Jun, CHEN Shuai, CHEN Niancu, YU Xudong, ZENG Ying. Measurements and simulation for aqueous quaternary system MgCl₂-SrCl₂-AlCl₃-H₂O at 298.2 K[J]. CIESC Journal, 2020, 71(12): 5443-5451 DOI: 10.11949/0438-1157.20200420.
郑秋风, 罗军, 陈帅, 陈念粗, 于旭东, 曾英. 298.2 K四元体系MgCl₂-SrCl₂-AlCl₃-H₂O相平衡实验及溶解度计算[J]. 化工学报, 2020, 71(12): 5443-5451 DOI: 10.11949/0438-1157.20200420. DOI：

ZHENG Qiufeng, LUO Jun, CHEN Shuai, CHEN Niancu, YU Xudong, ZENG Ying. Measurements and simulation for aqueous quaternary system MgCl₂-SrCl₂-AlCl₃-H₂O at 298.2 K[J]. CIESC Journal, 2020, 71(12): 5443-5451 DOI: 10.11949/0438-1157.20200420. DOI：

摘要

采用等温溶解平衡法研究了298.2 K四元体系MgCl

-SrCl

-AlCl

-H

O的相平衡关系，测定了该体系的溶解度和平衡溶液的密度、折射率。根据实验数据，分别绘制了298.2 K该四元体系的空间立体图、相图、水图、密度-组成图和折射率-组成图。研究发现：298.2 K下，四元体系MgCl

-SrCl

-AlCl

-H

O无复盐或固溶体生成，稳定相图由2个共饱点、5条单变量曲线和4个结晶区组成。四个结晶区分别为MgCl

·6H

O、SrCl

·6H

O、SrCl

·2H

O和AlCl

·6H

O，其中SrCl

·6H

O结晶区最大，SrCl

·2H

O结晶区最小，说明SrCl

·6H

O更容易结晶析出。平衡液相的密度和折射率随着

（MgCl

）的变化呈规律性变化。采用Pitzer模型进行了298.2 K四元体系MgCl

-SrCl

-AlCl

-H

O溶解度计算，对比发现，计算结果与实验结果基本吻合。

Abstract

Solid-liquid equilibria of the aqueous quaternary system MgCl

-SrCl

-AlCl

-H

O at 298.2 K was studied by using the isothermal dissolution equilibrium method. The solubility

density

and refractive index of the aqueous quaternary system were measured. The corresponding space diagram

stable phase diagram

water content diagram

and the diagrams of density

composition

refractive index

composition were constructed based on the experimental data. The results show that there is no double that salt or solid solution was formed in the quaternary system. The stable phase diagram of the quaternary system MgCl

-SrCl

-AlCl

-H

O at 298.2 K consists of two invariant points

five isothermal dissolution curves

and four crystallization regions. The four crystallization regions correspond to four single hydrate salts magnesium chloride hexahydrate (MgCl

·6H

strontium chloride hexahydrate (SrCl

·6H

strontium chloride dihydrate (SrCl

·2H

and aluminum chloride hexahydrate (AlCl

·6H

O). With a view to the crystallization regions

the crystallization region of salt SrCl

·2H

O is the smallest

while the crystallization region of salt SrCl

·6H

O is the largest

meaning SrCl

·6H

O can be more easily separated from solution than other coexisting salts in this system at 298.2 K. The densities and refractive indices of the solution at equilibrium change regularly with the change of

(MgCl

) of the solution. The Pitzer model is used to calculate the solubility of the 298.2 K quaternary system MgCl

-SrCl

-AlCl

-H

O. The comparison found that the calculated results are basically consistent with the experimental results.

关键词

Keywords

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