Mg2+, K+//Cl-, B4O2-7-H2O四元体系288 K固液相平衡

采用等温溶解平衡法研究了288 K时Mg2+, K+//Cl-, B4O2-7-H2O四元体系的相平衡关系, 测定该体系在288 K时平衡液相的溶解度和密度. 依据实验测定的平衡溶解度数据及对应的平衡固相, 绘制了该四元体系的平衡相图以及其密度-组成图. 研究结果表明, 四元体系Mg2+, K+//Cl-, B4O2-7-H2O 288 K时的固液相平衡实验中, 有复盐KCl·MgCl2·6H2O生成, 平衡相图中有3个共饱点, 7条单变量曲线, 5个结晶区, 对应的平衡固相分别为MgB4O7·9H2O, K2B4O7·4H2O, KCl, MgCl2·6H2O, KCl·MgCl2·6H2O. 简要讨论了实验结果.

Solid-Liquid Phase Equilibrium of the Quaternary System Mg2+, K+//Cl-, B4O2-7-H2O at 288 K

Phase equilibria of the reciprocal quaternary system Mg2+, K+//Cl-, B4O2-7-H2O at 288 K were studied by the isothermal solution equilibrium method. Solubilities and densities in solution of the system were determined experimentally. The equilibrium phase diagram and the density-composition diagram of the quaternary system were plotted using experimental data. Experimental results also showed that the double salt KCl·MgCl2·6H2O formed in the quaternary system Mg2+, K+//Cl-, B4O2-7-H2O at 288 K. The quaternary system at 288 K had three invariant points (F1, F2, and F3), seven univariant curves, and five fields of crystallization MgB4O7·9H2O, K2B4O7·4H2O, KCl, MgCl2·6H2O, and KCl·MgCl2·6H2O]. The results are discussed simply.