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Li Z.,Chengdu University of Technology | Yu X.,Chengdu University of Technology | Yin Q.,Chengdu University of Technology | Zeng Y.,Chengdu University of Technology | Zeng Y.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions
Fluid Phase Equilibria | Year: 2013

The solubilities and physicochemical properties (densities and refractive indices) in the aqueous quaternary system LiCl+KCl+RbCl+H2O were investigated at 323.15K using an isothermal evaporation method. The stereo phase diagram, the projected diagram, the water content diagram and the physicochemical properties versus composition diagrams were plotted based on the measured data. There are two invariant points, five univariant curves and four crystallization fields corresponding to single salts potassium chloride (KCl), rubidium chloride (RbCl), lithium chloride monohydrate (LiCl·H2O) and a solid solution of potassium and rubidium chloride [(K, Rb)Cl] in the projected diagram. No double salt was formed. Comparisons between the metastable phase diagrams at 298.15K and 323.15K show that the crystallization zones of solid solution [(K, Rb)Cl] decreased at 323.15K, while the crystallization zones of single salts KCl, RbCl, and LiCl·H2O enlarged at 323.15K. The calculated refractive indices using empirical equations have a maximum relative error less than 0.008. © 2013 Elsevier B.V.


Li J.,Chengdu University of Technology | Zeng Y.,Chengdu University of Technology | Zeng Y.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions | Yu X.,Chengdu University of Technology | Peng Y.,Chengdu University of Technology
Journal of Chemical and Engineering Data | Year: 2013

An isothermal evaporation method was employed to study the solubilities of the aqueous quaternary system Li+, Na+//CO 3 2-, SO4 2--H2O at 273.15 K, and the corresponding densities of the equilibrated solution were determined by the specific gravity bottle method. According to the experimental data, the metastable phase diagram, the water content diagram, and the density versus composition diagram were constructed. Results indicate that the quaternary system is of a complex type due to the two double salts Na3Li(SO 4)2·6H2O and 2Na2SO 4·Na2CO3 formed. There are four invariant points, six crystallization fields corresponding to four single salts (Li2CO3, Li2SO4·H 2O, Na2SO4·10H2O, and Na 2CO3·10H2O) and two double salts (Na3Li(SO4)2·6H2O and 2Na2SO4·Na2CO3) in this metastable phase diagram. The comparison was made between the metastable phase diagrams at 273.15 K and at 288.15 K and also between the metastable phase diagram at 273.15 K and stable phase diagrams at (298.15, 323.15, and 373.15) K. Results show that double salt 2Na2SO4·Na 2CO3 is formed at T = (273.15, 323.15, and 373.15) K, while it is not formed at T = (288.15 and 298.15) K. © 2013 American Chemical Society.


Jiang D.,Chengdu University of Technology | Zeng Y.,Chengdu University of Technology | Zeng Y.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions | Yu X.,Chengdu University of Technology
Fluid Phase Equilibria | Year: 2013

By employing the method of isothermal evaporation, the metastable phase equilibria of the quaternary systems KCl + RbCl + MgCl2 + H2O were researched at 323.15 K. In this paper, the solubilities and physicochemical properties, such as refractive indices and densities of the equilibrated solution, were determined. Through analysis of the experiments data, the metastable phase diagram, the water content diagram and physicochemical properties versus composition diagrams of the quaternary system were plotted. The study results indicated that in the metastable phase diagram, there were four invariant points (H1, H2, H3, H4), nine univariant curves, and six crystallization fields. And the six crystallization fields were magnesium chloride hexahydrate (MgCl2·6H2O) and potassium chloride (KCl) and rubidium chloride (RbCl) and a rubidium and magnesium chloride double salt named carnallite (RbCl·MgCl2·6H2O) and a potassium and magnesium chloride double salt named carnallite (KCl·MgCl2·6H2O) and a solid solution of potassium and rubidium chloride [(K, Rb)Cl]. The solid solution [(K, Rb)Cl] had the largest crystallization field. This showed that only by using evaporation and crystallization methods at 323.15 K, was it difficult to separate potassium from rubidium in chloride solution. The physicochemical properties of the quaternary system change regularly with the changes of composition in aqueous solutions. © 2013 Elsevier B.V.


Yu X.,Chengdu University of Technology | Zeng Y.,Chengdu University of Technology | Zeng Y.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions | Yin Q.,Chengdu University of Technology | Mu P.,Chengdu University of Technology
Journal of Chemical and Engineering Data | Year: 2012

The solubilities of electrolyte mixtures ternary systems KCl + RbCl + H2O and KCl + MgCl2 + H2O at 348.15 K were obtained by isothermal evaporation method. The corresponding physicochemical properties of the solution such as density and refractive index were also determined. The Scherinemakers' wet residue method was used to determine the composition of the solid phase. The metastable phase diagram, density versus composition diagram, and refractive index versus composition diagram were constructed on the basis of the experimental data. Results showed that these two ternary systems were both complex type. The incommensurare double salt carnallite (KCl·MgCl2·6H2O) was found in the KCl + MgCl2+ H2O system at 348.15 K. Comparisons between the metastable phase diagrams of KCl + MgCl2+ H2O system at (298.15, 323.15, and 348.15) K show that the crystallization zone of carnallite decreases with the increase in temperature. The solid solution [(K,Rb)Cl] was formed in the KCl + RbCl + H2O system at 348.15 K. Comparisons between the metastable phase diagrams of KCl + RbCl + H2O system at (298.15, 323.15, and 348.15) K show that the crystallization zone of [(K,Rb)Cl] decreases with the increase in temperature. The empirical equation was used to calculate the refractive indices of the equilibrated solution. The calculated results keep in line with experimental values with the maximum relative error less than 0.005. © 2012 American Chemical Society.


Wang R.,Chengdu University of Technology | Zeng Y.,Chengdu University of Technology | Zeng Y.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions
Journal of Chemical and Engineering Data | Year: 2014

The metastable phase equilibrium of the quinary aqueous system Li + + K+ + Cl- + CO3 2- + B4O7 2- + H2O was investigated at 273.15 K using an isothermal evaporation method. The solubilities and densities of the equilibrated solution were determined. Based on the experimental data, the space metastable phase diagram and the projected phase diagram saturated with salt Li2CO3 of the quinary system at 273.15 K were constructed. The projected phase diagram of this system consists of three invariant points, seven univariant curves, and five crystallization fields corresponding to the single salts LiCl·H2O, KCl, K 2B4O7·4H2O, K 2CO3·3/2H2O, and LiBO 2·8H2O. Comparisons between the phase diagrams at 273.15 K and at 298.15 K show that the crystallization form of lithium borate is LiBO2·8H2O at 273.15 K, which formed as Li 2B4O7·5H2O at 298.15 K. © 2014 American Chemical Society.

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