Phase equilibria of AlCl3+CaCl2+H2O, AlCl3+FeCl3+H2O and CaCl2+FeCl3+H2O ternary systems at 35℃

YUAN Mengxia; QIAO Xiuchen

doi:10.11949/j.issn.0438-1157.20161758

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Phase equilibria of AlCl₃+CaCl₂+H₂O, AlCl₃+FeCl₃+H₂O and CaCl₂+FeCl₃+H₂O ternary systems at 35℃

更新时间：2025-12-10

- Phase equilibria of AlCl₃+CaCl₂+H₂O, AlCl₃+FeCl₃+H₂O and CaCl₂+FeCl₃+H₂O ternary systems at 35℃
- CIESC Journal Issue 7, Pages: 2653-2659(2017)
- 作者机构：
  
  华东理工大学资源与环境工程学院,上海,200237
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161758
  CLC： Q013.1
- Online First：05 July 2017，
  
  Published：05 July 2017
- 稿件说明：
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YUAN Mengxia, QIAO Xiuchen. Phase equilibria of AlCl₃+CaCl₂+H₂O, AlCl₃+FeCl₃+H₂O and CaCl₂+FeCl₃+H₂O ternary systems at 35℃[J]. CIESC Journal, 2017, (7): 2653-2659. DOI: 10.11949/j.issn.0438-1157.20161758.
DOI：

YUAN Mengxia, QIAO Xiuchen. Phase equilibria of AlCl₃+CaCl₂+H₂O, AlCl₃+FeCl₃+H₂O and CaCl₂+FeCl₃+H₂O ternary systems at 35℃[J]. CIESC Journal, 2017, (7): 2653-2659. DOI: 10.11949/j.issn.0438-1157.20161758. DOI：

摘要

缺少含AlCl3、CaCl2和FeCl3的溶液相平衡，使通过蒸发结晶从粉煤灰盐酸浸取液中制备纯净的AlCl3·6H2O变得比较困难。采用等温溶解法研究了三元体系AlCl3+CaCl2+H2O，AlCl3+FeCl3+H2O和CaCl2+FeCl3+H2O在35℃时的相平衡关系，测定了相应的溶解度及密度，并绘制了相应相图及密度-组成图。实验结果表明：三元体系AlCl3+CaCl2+H2O和AlCl3+FeCl3+H2O分别有两条溶解度曲线，两个单盐结晶区，无复盐和共溶体产生，同离子效应导致增加溶液中CaCl2和FeCl3浓度会有效降低AlCl3的溶解度；CaCl2+FeCl3+H2O体系会形成复盐CaCl2·2FeCl3·7H2O；所得35℃相图与25℃相图相比，三元体系AlCl3+CaCl2+H2O和AlCl3+FeCl3+H2O中AlCl3·6H2O结晶区增大，CaCl2·6H2O结晶区转变成CaCl2·4H2O结晶区，CaCl2+FeCl3+H2O体系中CaCl2·2FeCl3·8H2O结晶区转变为CaCl2·2FeCl3·7H2O结晶区。

Abstract

It is difficult to prepare pure AlCl3·6H2O through evaporation crystallization in aluminum recovery from leaching coal fly ash by hydrochloric acid

without phase equilibria diagram for AlCl3

CaCl2 and FeCl3 solution. The phase equilibria of AlCl3+CaCl2+H2O

AlCl3+FeCl3+H2O and CaCl2+ FeCl3+H2O ternary systems at 35℃ were investigated using isothermal dissolution method. After solubility and densities were measured

phase diagram and density diagram were plotted against compositions. The phase diagrams of AlCl3+CaCl2+H2O and AlCl3+FeCl3+H2O had two univariant curves and two crystallization zones without formation of double salt or solid solution. Solubility of AlCl3 decreased with increasing concentration of CaCl2 or FeCl3 due to common ion effect. Double salt CaCl2·2FeCl3·7H2O was formed in CaCl2+FeCl3+H2O ternary system. When temperature was increased from 25℃ to 35℃

phase equilibria diagrams of AlCl3+CaCl2+H2O

AlCl3+FeCl3+H2O and CaCl2+FeCl3+H2O were all changed. Crystallization zone of AlCl3·6H2O in AlCl3+CaCl2+H2O and AlCl3+FeCl3+H2O ternary systems was enlarged and crystallization zone of CaCl2·6H2O was converted into crystallization zone of CaCl2·4H2O. Crystallization zone of CaCl2·2FeCl3·8H2O in CaCl2+FeCl3+H2O ternary system was converted into crystallization zone of CaCl2·2FeCl3·7H2O.

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