Phase equilibria and phase diagram of the quaternary system (Li+, Mg2+//Cl-, borate-H2O) at 308.15 K

被引：0
|
作者：
Li D. [1 ]
Wang J. [1 ]
Wang S. [1 ,2 ]
机构：
[1] School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin
[2] College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 06期
关键词：
Lithium salts; Magnesium borate; Phase equilibria and phase diagram; Pitzer model; Salt lake brine system;
D O I：
10.11949/0438-1157.20201690
中图分类号：
学科分类号：
摘要：
Solid-liquid phase equilibria and phase diagrams for the quaternary system (Li+, Mg2+//Cl-, borate-H2O) were investigated, and the compositions in liquid phase, densities, refractive indices and pH were measured experimentally by using isothermal dissolution equilibrium method. There are five minerals corresponding to LiCl•H2O, Li2B4O7•3H2O, MgCl2•6H2O, Mg2B6O11•15H2O, and the lithium carnallite LiCl•MgCl2•7H2O existed in this system. Mg2B6O11•15H2O occupies the greatest part of phase region, while LiCl•MgCl2•7H2O covers the smallest. The mineral LiCl•MgCl2•7H2O belongs to the incongruent double salt, and hungchaoite (MgB4O7•9H2O) is transformed into Mg2B6O11•15H2O in the concentrated MgCl2 aqueous solution. The crystalline area of inderite is the largest, indicating that magnesium borate is easy to crystallize, while the crystalline area of lithium carnallite is the smallest. The solubility of this quaternary system were predicted using Pitzer thermodynamics model, and the calculated solubility agreed well with experimental data. The phase equilibrium study of this quaternary system (Li+, Mg2+//Cl-, borate-H2O) will provide a theoretical basis to promote the development of lithium, magnesium and boron products and to guide the comprehensive utilization of this precious salt lake brine resources. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：3170 / 3178
页数：8
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