Metastable Phase Equilibrium of the Quaternary System Na+, Rb+, Mg2+//Cl--H2O at 298.2 K

doi:10.1007/s40242-018-7304-1

Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (5): 823-827.doi: 10.1007/s40242-018-7304-1

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Metastable Phase Equilibrium of the Quaternary System Na⁺, Rb⁺, Mg²⁺//Cl^--H₂O at 298.2 K

WU Liting¹, ZENG Ying^1,2, YAN Dongming¹, FENG Shan^1,2, YU Xudong^1,2

1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, P. R. China;
2. Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-Purpose Utilization, Chengdu University of Technology, Chengdu 610059, P. R. China

Received:2017-09-12 Revised:2018-04-09 Online:2018-10-01 Published:2018-04-28
Contact: ZENG Ying,Email:zengyster@163.com E-mail:zengyster@163.com
Supported by:
Supported by the National Natural Science Foundation of China(Nos.U1607121, 41473059, 41173071), the Sichuan Youth Science and Technology Innovation Research Team Funding Scheme, China(No.2013TD0005), and the Innovation Team of Chengdu University of Technology, China(No.KYTD201405).

Abstract

Abstract: The component solubilities, densities and refractive indices of the quaternary system Na⁺, Rb⁺, Mg²⁺//Cl^--H₂O at 298.2 K were measured using an isothermal evaporation method. Based on the gathered data, a metastable phase diagram, a water content diagram, and a density/refractive index vs. composition diagram were constructed. The results show that this system is of a complex type with a double salt rubidium carnallite (RbCl·MgCl₂·6H₂O) formed at 298.2 K. Double salt rubidium carnallite, whose component point locates in its own crystallization zone in the dry salt phase diagram, belongs to congruent double salt at 298.2 K. Accompanied by the double salt that was formed, there are two invariant points in the phase diagram that cosaturated with three salts and an equilibrated solution. The cosaturated salts for the two invariant points are MgCl₂·6H₂O+RbCl·MgCl₂·6H₂O+ NaCl and NaCl+RbCl+RbCl·MgCl₂·6H₂O, respectively. Both invariant points are commensurate invariant points in the evaporation process, and the two invariant points are evaporative dry points. The sizes of the crystalline regions of the salts are in the order of NaCl > RbCl > RbCl·MgCl₂·6H₂O > MgCl₂·6H₂O.

Key words: Metastable phase equilibrium, Rubidium carnallitite, Quaternary system

WU Liting, ZENG Ying, YAN Dongming, FENG Shan, YU Xudong. Metastable Phase Equilibrium of the Quaternary System Na⁺, Rb⁺, Mg²⁺//Cl^--H₂O at 298.2 K[J]. Chemical Research in Chinese Universities, 2018, 34(5): 823-827.

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Metastable Phase Equilibrium of the Quaternary System Na⁺, Rb⁺, Mg²⁺//Cl^--H₂O at 298.2 K

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