Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl＋MgCl2＋Li2SO4＋MgSO4＋H2O at 348.15 K and 0.1 MPa

作     者：YU Xiaoping WANG Qin GUO Yafei DENG Tianlong 

作者机构：Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials Science Tianjin University of Science and Technology Tianjin 300457 P. R. China College of Chemistry and Alaterials Science Northwest University Xi 'an 710127 P. R. China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2018年第34卷第5期

页      面：798-802页

核心收录：

学科分类：0711[理学-系统科学] 12[管理学] 080503[工学-材料加工工程] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 07[理学] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0811[工学-控制科学与工程] 081103[工学-系统工程] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.U1607129  U1607123  21773170)  the China Postdoctoral Science Foundation(Nos.2016M592827  2016M592828)  the Application Foundation and Advanced Technology Program of Tianjin  China(No. 15JCQNJC08300)  and the Yangtze Scholars and Innovative Research Team of the Chinese University(No.IRT-17R81 ) 

主　　题：Phase equilibrium Phase diagram Solubility Quaternary system Lithium salt 

摘      要：The metastable solubilities and the physicochemical properties including density and pH of the reciprocal quaternary system（LiCl＋MgCl2＋Li2SO4＋MgSO4＋H2O） at 348.15 K and 0.1 MPa were determined using the isother- mal evaporation method. The dry-salt diagram and water-phase diagram were plotted based on the experimental data. There are five invariant points, eleven tmivariant curves, and seven crystallization zones corresponding to hexahy- drite, tetrahydrite, kieserite, bischofite, lithium sulfate monohydrate, lithium chloride monohydrate and lithium car- nallite. Comparison between the stable and metastable diagrams at 348.15 K indicates that the metastable phenome- non of magnesium sulfate is obvious, and the crystallization regions of hexahydrite and tetrahydrite disappear in the stable phase diagram. A comparison of the metastable dry-salt phase diagrams at 308.15, 323.15 and 348.15 K shows that with the increasing of temperatttre the epsomite crystallization zone disappears from the dry-salt phase diagranl of 303.15 K, and a new kieserite crystallization zone is presented at 348.15 K. The density and pH in the metastable equilibrium solution present regular change with the increasing of Janecke index J（2Li＋）, and the calculated densities using the empirical equation agree well with the experimental values.