Phase Equilibrium of the Quaternary System Containing Lithium, Magnesium, Sulfate, and Borate in Aqueous Solution at 308 K
Phase Equilibrium of the Quaternary System Containing Lithium, Magnesium, Sulfate, and Borate in Aqueous Solution at 308 K
复制标题
DOI：
10.1021/je5002939
复制
发表时间：
2014-07
影响因子：
--
通讯作者：
Hongcang Li;S. Ni;Ying Zeng
中科院分区：
文献类型：
--
作者：
Hongcang Li;S. Ni;Ying Zeng
采用等温溶解法研究了含锂、镁、硫酸盐和硼酸盐的混合水体系在308 K时的相平衡。用x射线衍射法确定了不变量点的固相。建立了稳定相图、水含量图和溶液组成与理化性质的关系图。该体系包含2个不变点（记为E1和E2）、5条不变曲线和4个结晶场，分别对应于单盐：epsomite （MgSO4·7H2O）、hunchaoite （MgB4O7·9H2O）、一水硫酸锂（Li2SO4·H2O）和三水硼酸锂（Li2B4O7·3H2O）。不变点E1和E2是相称的不变点。结晶场的大小顺序为MgB4O7·9H2O→Li2B4O7·3H2O→Li2SO4·H2O→MgSO4·7H2O，与盐的溶解度相反。与298 K温度相比，MgB4盐的结晶面积增大了。
An isothermal dissolution method was employed to investigate the phase equilibrium at 308 K of the mixed aqueous system containing lithium, magnesium, sulfate, and borate. The solid phases of the invariant points were confirmed with the X-ray diffraction method. The stable phase diagram, the water content diagram, and the diagrams of the physicochemical properties versus the composition of the solution have been constructed. The system contained two invariant points (noted as E1 and E2), five univariant curves, and four crystallization fields corresponding to single salts epsomite (MgSO4·7H2O), hungchaoite (MgB4O7·9H2O), lithium sulfate monohydrate (Li2SO4·H2O), and lithium borate trihydrate (Li2B4O7·3H2O). Invariant points E1 and E2 are of commensurate invariant points. The crystallization fields decrease in the sequence MgB4O7·9H2O, Li2B4O7·3H2O, Li2SO4·H2O, and MgSO4·7H2O, which was contrary with the solubility of the salts. Compared with the temperature at 298 K, the crystallization area of salts MgB4...