物理化学学报 >> 2009, Vol. 25 >> Issue (02): 331-335.doi: 10.3866/PKU.WHXB20090223

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

桑世华; 彭江; 魏丽娜   

  1. 成都理工大学材料与化学化工学院, 成都 610059
  • 收稿日期:2008-08-25 修回日期:2008-10-13 发布日期:2009-01-16
  • 通讯作者: 桑世华 E-mail:sangsh@cdut.edu.cn

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

SANG Shi-Hua; PENG Jiang; WEI Li-Na   

  1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, P. R. China
  • Received:2008-08-25 Revised:2008-10-13 Published:2009-01-16
  • Contact: SANG Shi-Hua E-mail:sangsh@cdut.edu.cn

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摘要： 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.

关键词: 水盐体系, 相平衡, 硼酸盐, 溶解度

Abstract: 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.

Key words: Salt-water system, Phase equilibrium, Borate, Solubility