四元体系硼酸锂-硼酸钾-硼酸镁-水在308.15 K时固液相平衡研究  

Solid-liquid phase equilibria in quaternary system lithium borate-potassium borate-magnesium borate-water at 308.15 K

作　　者：王居奎 董兴锋 赵冬 王士强 郭亚飞[1,2] 邓天龙 Wang Jukui;Dong Xingfeng;Zhao Dong;Wang Shiqiang;Guo Yafei;Deng Tianlong(College of Chemical Engineering and Material Science,Tianjin University of Science and Technology,Tianjin 300457,China;Tianjin Key Laboratory of Marine Resources and Chemistry)

机构地区：[1]天津科技大学化工与材料学院,天津300457 [2]天津市海洋资源与化学重点实验室

出　　处：《无机盐工业》2020年第5期27-30,44,共5页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(U1707602,U1507109,U1607123,21773170);天津市自然基金项目(17JCYBJC19500)。

摘　　要：采用等温溶解平衡法研究四元体系硼酸锂-硼酸钾-硼酸镁-水在308.15 K时固液相平衡,测定了体系溶解度和平衡液相的密度、折光率和pH。研究发现:该体系308.15 K时的稳定相图中包含一个共饱点(L+Li2B4O7·3H2O+K2B4O7·4H2O+Mg2B6O11·15H2O),其液相组成:w(Li2B4O7)=3.112%、w(K2B4O7)=16.64%、w(Mg2B6O11)=0.1018%;3个固相结晶区:Li2B4O7·3H2O、K2B4O7·4H2O、Mg2B6O11·15H2O,体系无复盐或固溶体生成。溶液中硼酸锂、硼酸钾对多水硼镁石有很强的盐析效应,液相的密度、折光率和pH随溶液中硼酸盐浓度的增加呈规律性变化。The phase equilibrium of the quaternary system lithium borate-potassium borate-magnesium borate-water was studied at 308.15 K with isothermal solution saturation method.Solubilities,densities,refractive indices and pH of the system were determined.Stability phase diagram of this system contains one invariant point(L+Li2 B4 O7·3 H2 O+K2 B4 O7·4 H2 O+Mg2 B6 O11·15 H2 O) which liquid compositions were as follows:w(Li2 B4 O7)=3.11%,w(K2 B4 O7)=16.64% and w(Mg2 B6 O11)=0.10%;and three crystallization regions corresponding to Li2 B4 O7·3 H2 O,K2 B4O7·4 H2 O and Mg2 B6 O11·15 H2 O,respectively.Neither double salts nor solid solutions formed in this system,and the K2 B4 O7 and Li2 B4 O7 in solution both had a strong salting-out effect on inderite.The solution density,refractive index and pH of the quaternary system changes regularly with the increasing of borate concentration.

关 键 词：固液相平衡 溶解度 水盐体系相图 多水硼镁石 

分 类 号：TQ128.54[化学工程—无机化工]