Experimental determination and modeling of the solubility phase diagram of the ternary system (Li2SO4 + K2SO4 + H2O) at 288.15 K

被引：40

作者：

Wang, Shiqiang ^{[1
]}

Guo, Yafei ^{[1
]}

Li, Dongchan ^{[2
]}

Tang, Peng ^{[1
]}

Deng, Tianlong ^{[1
]}

机构：

[1] Tianjin Univ Sci & Technol, Coll Marine Sci & Engn, Tianjin Key Lab Marine Resources & Chem, Tianjin 300457, Peoples R China

[2] Hebei Univ Technol, Minist Educ, Engn Res Ctr Seawater Utilizat Technol, Tianjin 300130, Peoples R China

来源：

THERMOCHIMICA ACTA | 2015年 / 601卷

基金：

中国国家自然科学基金;

关键词：

Stable phase equilibrium; Solubility calculation; Pitzer ion-interaction model; Lithium sulfate; Potassium sulfate; RECIPROCAL QUATERNARY SYSTEM; MINERAL SOLUBILITIES; NATURAL-WATERS; NA-K-MG-CA-CL-SO4-H2O SYSTEM; COPPER(II) SULFATES; EQUILIBRIA; THERMODYNAMICS; PREDICTION; 25-DEGREES-C; POTASSIUM;

D O I：

10.1016/j.tca.2015.01.003

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The solubility and density in the thermodynamic phase equilibria ternary system (Li2SO4 + K2SO4 + H2O) at 288.15 K and 0.1 MPa were investigated experimentally with the method of isothermal dissolution equilibrium. This system at 288.15 K consists of two invariant points, three univariant isothermal dissolution curves; and three crystallization regions. The salt Li2SO4 center dot K2SO4 belongs to the incongruent double salt, and no solid solution was found. Based on the Pitzer model and its extended Harvie-Weare (HW) model, the mixing ion-interaction parameters of theta(Li,K,) psi(Li),(K,SO4) at 288.15 K and the solubility equilibrium constants K-sp of solid phases Li2SO4 center dot H2O and Li2SO4 center dot K2SO4, which are not reported in the literature were acquired. A comparison between the calculated and experimental results at 288.15 K for the ternary system shows that the calculated solubilities obtained with the extended HW model agree well with experimental data. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：75 / 81

页数：7

共 31 条

[1] Metastable Phase Equilibrium in the Aqueous Ternary System Li2SO4 + MgSO4 + H2O at 323.15 K [J].