Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions

Chengdu, China

Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions

Chengdu, China
SEARCH FILTERS
Time filter
Source Type

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.


Yu X.,Chengdu University of Technology | Yin Q.,Chengdu University of Technology | Jiang D.,Chengdu University of Technology | Zeng Y.,Chengdu University of Technology | Zeng Y.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions
Korean Journal of Chemical Engineering | Year: 2014

The metastable equilibrium of the system contained with lithium, potassium, magnesium, and chloride in aqueous system was investigated at 323 K using an isothermal evaporation method. The isothermal experimental data and physicochemical properties, such as density and refractive index of the equilibrated solution, were determined. With the experimental results, the stereo phase diagram, the projected phase diagram, the water content diagram and the physicochemical properties versus composition diagrams were constructed. The projected phase diagram consists of three invariant points, seven univariant curves and five crystallization fields corresponding to single salts potassium chloride (KCl), lithium chloride monohydrate (LiCl·H2O), bischofite (MgCl2·6H2O) and two double salts lithium carnallite (LiCl·MgCl2·7H2O) and potassium carnallite (KCl·MgCl2·6H2O). Salt KCl has the largest crystallization region; it contains almost 95% of the general crystallization field. © 2014 Korean Institute of Chemical Engineers, Seoul, Korea.


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.


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.


Cui R.-Z.,Chengdu University of Technology | Cui R.-Z.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions | Sang S.-H.,Chengdu University of Technology | Sang S.-H.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions | And 2 more authors.
Journal of Chemical and Engineering Data | Year: 2013

Solid-liquid equilibria in the quaternary systems KCl-KBr-K 2B4O7-H2O and KCl-KBr-K 2SO4-H2O at 373 K were measured by the isothermal solution saturation method. The equilibrium solid phases, solubilities of salts, and densities of saturated solutions in the two systems were determined. The experimental data are used to plot the solubility diagrams, water content diagrams, and solution density diagrams of the two systems. It was found that both systems contain the solid solution of KCl and KBr [K(Cl,Br)], so their solubility diagrams have no invariant point, but each has a univariant curve and two crystallization regions. In the first system, the solids are K(Cl,Br) and potassium borate aquahydrate (K2B 4O7·4H2O), and in the second system, the solids are K(Cl,Br) and potassium sulfate (K2SO4). © 2013 American Chemical Society.


Yin Q.,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 | And 2 more authors.
Journal of Chemical and Engineering Data | Year: 2013

The metastable phase equilibrium of the quaternary system LiCl + KCl + RbCl + H2O at 348.15 K was done by using an isothermal evaporation method. The solubilities, densities, and refractive indices of the equilibrated solution were determined experimentally. On the basis of the measured data, the stereo phase diagram, the metastable phase diagram, the water content diagram, and the physicochemical properties versus composition diagrams were constructed. Results show that the quaternary system is of a complex type with the solid solution of potassium chloride and rubidium chloride [(K, Rb)Cl] formed at 348.15 K. The metastable phase diagram consists of 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]. Salt RbCl has the largest solubility among the coexisting salts and presents the smallest crystallization field in the phase diagram. The crystallization region of [(K, Rb)Cl] almost occupies the entire phase region, which shows that it is difficult to separate potassium from rubidium in chloride solution by only using evaporation and crystallization methods. This is compared with the metastable phase diagram of the quaternary system at 298.15 K that shows that the crystallization forms have not changed, while the crystallization fields have slightly change. The refractive index of the solution has been calculated using an empirical equation. The maximum absolute deviation between the calculated and experimental data of the refractive index is less than 0.007. © 2013 American Chemical Society.


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.


Sang S.-H.,Chengdu University of Technology | Sang S.-H.,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions | Zhang X.,Chengdu University of Technology | Zhang X.,China Railway Eryuan Engineering Group Co. | And 2 more authors.
Journal of Chemical and Engineering Data | Year: 2012

The solid-liquid equilibria in the quinary system Na +, K +//Cl -, SO 4 2-, B 4O 7 2--H 2O at 323 K has been studied experimentally using the method of isothermal solution saturation. Solubilities and densities of the solution of the quinary system were measured. On the basis of the solubility data and corresponding equilibrium solids, the dry-salt phase diagram and water content diagram of the quinary system were plotted, respectively. In the dry-salt solubility diagram, there are four invariant points, nine univariant curves, and six fields of crystallization saturated with Na 2B 4O 7·10H 2O, where the solids are Na 2SO 4, Na 2SO 4· 3K 2SO 4(Gla), K 2SO 4, K 2B 4O 7·4H 2O, NaCl, and KCl, respectively. The experimental results show that Na 2SO 4, Na 2SO 4·3K 2SO 4(Gla), K 2SO 4, and K 2B 4O 7· 4H 2O have bigger fields of crystallization than other salts in the quinary system Na +, K +//Cl -, SO 4 2-, B 4O 7 2--H 2O at 323 K. © 2012 American Chemical Society.


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.


Yu X.,Chengdu University of Technology | Jiang D.,Chengdu University of Technology | Tan 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: 2014

The densities, refractive indices and compositions of solutions of electrolyte mixtures in quaternary system LiCl+RbCl+MgCl2+H2O at 323K were determined by isothermal evaporation method. The stereo phase diagram, the metastable phase diagram, the water content diagram, and the diagrams of the physicochemical properties depending on the composition were obtained using the measured data. The metastable phase diagram of this quaternary system contains three invariant points (H1, H2, and H3), seven univariant curves, and five crystallization fields corresponding to single salts lithium chloride monohydrate (LiCl·H2O), rubidium chloride (RbCl), magnesium chloride hexahydrate (MgCl2·6H2O), and two double salts: lithium carnallite (LiCl·MgCl2·7H2O) and rubidium carnallite (RbCl·MgCl2·6H2O). The scope of areas of crystallization of salts is such that RbCl·MgCl2·6H2O>RbCl>LiCl·H2O>MgCl2·6H2O>LiCl·MgCl2·7H2O. The physicochemical properties of the solutions, at equilibrium, change regularly with the change of the concentration of MgCl2. © 2014.

Loading Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions collaborators
Loading Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions collaborators