化工学报2016，Vol.67Issue(4)：1117-1122,6.DOI:10.11949/j.issn.0438-1157.20151204
四元体系LiCl-LiBO2-Li2SO4-H2O在298.15 K时的相平衡
Phase equilibria of quaternary system LiCl-LiBO2-Li2SO4-H2Oat298.15K
摘要
Abstract
The phase equilibria and phase diagram of the quaternary system (LiCl-LiBO2-Li2SO4-H2O) at 298.15 K, which was not reported in the literature, were studied with the isothermal dissolution equilibrium method. Solubilities and physicochemical properties including refractive index (nD), density (ρ), pH and conductivity (κ) in the quaternary system were determined experimentally. According to the experimental data, the dry-salt diagram, water-phase diagram and the diagram of physicochemical propertiesversus lithium chloride concentration in the quaternary system were plotted, respectively. The experimental results showed that there were two invariant points named as invariant co-saturated point (Li2SO4·H2O + LiCl·H2O + LiBO2·2H2O) and incommensurate co-saturated point (Li2SO4·H2O + LiBO2·2H2O + LiBO2·8H2O), five univariant curves and four crystalline regions corresponding to Li2SO4·H2O, LiCl·H2O, LiBO2·8H2O and LiBO2·2H2O in the quaternary system at 298.15 K. Neither double salt nor solid solution was formed, and the phase diagram of this system at 298.15 K belonged to hydrate-typeⅡ. The two kinds of hydrate lithium-containing minerals (LiBO2·2H2O and LiBO2·8H2O) were found for the first time. The salting-out effect of LiCl in the solution was obvious for the composition of Li2SO4. The diagram of physicochemical properties includingnD,ρ, pH andκversus composition shows that the physicochemical properties were changed regularly with increasing lithium chloride concentration in the solution and the singular values were achieved at the invariant points of the quaternary system at 298.15 K.关键词
水盐体系/相平衡/水溶液/化学分析/硼酸盐/硫酸锂/等温溶解平衡法Key words
salt-water system/phase equilibria/aqueoussolution/chemicalanalysis/borate/lithium sulfate/isothermal dissolution equilibrium method分类
化学化工引用本文复制引用
曹丽娜,李珑,张楠,郭亚飞,邓天龙..四元体系LiCl-LiBO2-Li2SO4-H2O在298.15 K时的相平衡[J].化工学报,2016,67(4):1117-1122,6.基金项目
国家自然科学基金项目（21276194，41306136， U14076113）。@@@@supported by the National Natural Science Foundation of China (21276194,41306136, U14076113) （21276194,41306136, U14076113）
