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Sang S.-H.,Chengdu University of Technology | Sang S.-H.,Universities in Sichuan Province | Cui R.-Z.,Chengdu University of Technology | Cui R.-Z.,Universities in Sichuan Province | And 3 more authors.
Journal of Solution Chemistry | Year: 2014

The solubilities of salts and densities of saturated solutions in the NaCl-NaBr-H2O system at 323 K were determined with the method of isothermal solution saturation. The equilibrium solid phases in this system are solid solutions [Na(Cl,Br)]. The solid-liquid equilibrium phase diagram of the system has no invariant point. It has only one univariant curve and one crystallization region {saturated with solid solution Na(Cl,Br)}. Based on the above experimental results, the solid solution compositions fit well to a quadratic function of the equilibrium liquid composition. Based on the solubility data in the ternary systems NaCl-NaBr-H2O, the activity product (Q) of the solid solution was formulated with a polynomial of the solid solution composition. The solubilities salts in the ternary system at 323 K were calculated by Pitzer equations with the activity product of the solid solution. The results agree well with the experimental data. © 2014 Springer Science+Business Media New York. Source

Cui R.,Chengdu University of Technology | Cui R.,Universities in Sichuan Province | Sang S.,Chengdu University of Technology | Sang S.,Universities in Sichuan Province | And 4 more authors.
Calphad: Computer Coupling of Phase Diagrams and Thermochemistry | Year: 2015

The solubilities and densities of the quaternary system NaBr-KBr-CaBr2-H2O were investigated by the method of isothermal solution saturation at 298 K. On the basis of the experimental data, the phase diagram, water content diagram and the density-composition diagram were plotted, respectively. In the phase diagram of quaternary system NaBr-KBr-CaBr2-H2O at 298 K, no complex salt or solid solution was found. There are two invariant points, five univariant curves, and four crystallization fields corresponding to NaBr, NaBr·2H2O, KBr and CaBr2·6H2O. Pitzer's equations based model has been applied to calculate bromide minerals solubilities in the quaternary system NaBr-KBr-CaBr2-H2O at 298 K. All binary and mixing ion interaction parameters and solubility products of bromide solids are taken from previously published T-variation model for the system under study, adapted to 298 K. The predicted and experimental solubilities are in a very good agreement up to a very high total concentration of the quaternary system. © 2015 Published by Elsevier Ltd. Source

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