Measurements and calculations of solid-liquid equilibria in the quaternary system NaBr-KBr-Na2SO4-K2SO4-H2O at 298 K

被引：18

作者：

Cui, Rui-Zhi ^{[1
,2
]}

Yang, Lei ^{[1
,2
]}

Zhang, Ting-Ting ^{[1
,2
]}

Zhang, Xue-Ping ^{[1
,2
]}

Sang, Shi-Hua ^{[1
,2
]}

机构：

[1] Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Peoples R China

[2] Sichuan Higher Educ Inst, Mineral Resources Chem Key Lab, Chengdu 610059, Peoples R China

来源：

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY | 2016年 / 54卷

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

Underground brine; Thermodynamic solid-liquid equilibrium; Solubility; Phase diagram; Pitzer approach; ION-INTERACTION PARAMETERS; MINERAL SOLUBILITIES; NATURAL-WATERS; SOLUTION BEHAVIOR; DENOTES MOLALITY; MODEL; THERMODYNAMICS; TEMPERATURE; PREDICTION; ELECTROLYTES;

D O I：

10.1016/j.calphad.2016.06.005

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Solid-liquid equilibria in the quaternary system NaBr-KBr-Na2SO4-K2SO4-H2O at 298 K were measured by isothermal solution saturation method. The equilibrium solid phase and solubilities of salts in the system were determined. The experimental data are used to plot the solubility diagram and water content diagram of the quaternary system. It was found that quaternary system NaBr-KBr-Na2SO4-K2SO4-H2O at 298 K contains the double salt Na2SO4 center dot 3K(2)SO(4) (Gla), and its solubility diagram has four invariant points, nine univariant curves, and six crystallization fields. The solids are NaBr center dot 2H(2)O, Na2SO4, Na2SO4 center dot 10H(2)O, K2SO4, KBr and Na2SO4 center dot 3KSO(4) (Gla). The values of binary and mixing interaction parameters, the Debye-Huckel parameter A(phi) and the standard chemical potentials of the salts in the quaternary system at 298 K were obtained from the literature and adapted to standard temperature. Based on the Pitzer approach, the solubilities in the system NaBr-ICBr-Na2SO4-K2SO4-H2O at 298 K have been calculated using the parameters. The calculated and measured phase diagram of the quaternary system was plotted. The results show that the calculated solubilities agree well with the experimental data. (C) 2016 Published by Elsevier Ltd.

引用

页码：117 / 124

页数：8

共 34 条

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