Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (02): 331-335.doi: 10.3866/PKU.WHXB20090223

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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

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


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