Phase Equilibria of Quaternary System NaCl-NaBr-Na2B4O7-H2O at 348 K |
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| Authors: | LI Ting SANG Shi-hua CUI Rui-zhi ZHANG Kai-jie |
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| Institution: | 1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, P. R. China;
2. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu 610059, P. R. China |
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| Abstract: | The phase equilibria of quaternary system NaCl-NaBr-Na2B4O7-H2O at 348 K were studied by the isothermal equilibrium method. The solubilities and densities of the equilibrium solution were determined. According to the experimental data, the phase diagram, density-composition diagrams and water content diagram of the quaternary system at 348 K were plotted respectively. And the phase diagram consists of one univariant curve, two crystallization fields and without any invariant point of the quaternary system. The equilibrium solid phases of the two crysta- llization fields were Na(Cl, Br) and Na2B4O7·5H2O. The experimental results show that the quaternary system contained solid solution. The densities of the solution decrease with increasing NaCl concentration and increase with increasing NaBr concentration. |
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| Keywords: | Solid solution Phase equilibrium Solubility Salt-water system |
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