Phase Equilibria of Aqueous Quaternary System MgCl2+CaCl2+AlCl3+H2O at 298.2 K

HE Zhiyi; FANG Diandong; ZHENG Qiufeng; REN Siying; LUO Jun; YU Xudong

doi:10.13779/j.cnki.issn1001-0076.2022.06.018

2022 Vol. 42, No. 6

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Article navigation > Conservation and Utilization of Mineral Resources > 2022 > 42(6): 153-158

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HE Zhiyi, FANG Diandong, ZHENG Qiufeng, REN Siying, LUO Jun, YU Xudong. Phase Equilibria of Aqueous Quaternary System MgCl2+CaCl2+AlCl3+H2O at 298.2 K[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 153-158. doi: 10.13779/j.cnki.issn1001-0076.2022.06.018

Citation:

HE Zhiyi, FANG Diandong, ZHENG Qiufeng, REN Siying, LUO Jun, YU Xudong. Phase Equilibria of Aqueous Quaternary System MgCl₂+CaCl₂+AlCl₃+H₂O at 298.2 K[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 153-158. doi: 10.13779/j.cnki.issn1001-0076.2022.06.018

Phase Equilibria of Aqueous Quaternary System MgCl₂+CaCl₂+AlCl₃+H₂O at 298.2 K

1.
Sichuan Metallurgical Geological Survey and Design Group Co., Ltd, Chengdu 610051, China
2.
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China

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Corresponding author: YU Xudong, xwdlyxd@126.com

Received Date: 16 October 2022

Publish Date: 26 December 2022

Abstract

Abstract

In order to obtain the interaction law between aluminum and coexisting calcium and magnesium in leaching solution containing aluminum of fly ash, the phase equilibria of the quaternary system MgCl₂+CaCl₂+AlCl₃+H₂O was investigated by isothermal dissolution method at 298.2 K. The composition of liquid phase and density were determined. Meanwhile, the phase diagram, water diagram and density vs composition diagram of the quaternary system were drawn, respectively. It was found that the stable phase diagram of the quaternary system MgCl₂+CaCl₂+AlCl₃+H₂O consisted of two invariant points, four crystallization regions and five univariate curves, which belonged to a complex system with the double salt of tachyhydrite formed. These four crystallization regions corresponded to single salts MgCl₂·6H₂O, CaCl₂·6H₂O, AlCl₃·6H₂O and double salt 2MgCl₂·CaCl₂·12H₂O, respectively. The crystallization regions decreaseed in the order of AlCl₃·6H₂O, MgCl₂·6H₂O, CaCl₂·6H₂O and 2MgCl₂·CaCl₂·12H₂O, the solubility of AlCl₃·6H₂O was the smallest and the solubility of 2MgCl₂·CaCl₂·12H₂O is the highest.
- phase equilibria /
- quaternary system /
- solubility /
- tachyhydrite

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References

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