›› 2011, Vol. 19 ›› Issue (1): 101-107.

• THERMODYNAMICS AND CHEMICAL ENGINEERING DATA • Previous Articles     Next Articles

Liquid-solid Equilibria in Quinary System Na+, K+, Mg2+//Cl-, NO3--H2O at 25℃

HUANG Xueli, LI Songwan   

  1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China
  • Received:2010-07-08 Revised:2010-10-15 Online:2011-02-28 Published:2011-02-28
  • Supported by:
    Supported by the National Natural Science Foundation of China(20466003,20866008)

Liquid-solid Equilibria in Quinary System Na+, K+, Mg2+//Cl-, NO3--H2O at 25℃

黄雪莉, 李松菀   

  1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China
  • 通讯作者: HUANG Xueli, E-mail: xuelih@163.com
  • 基金资助:
    Supported by the National Natural Science Foundation of China(20466003,20866008)

Abstract: The solubilities of the quinary system Na+,K+,Mg2+//Cl,NO3--H2O and its two quaternary subsystems, Na+,K+,Mg2+//NO3--H2O and K+,Mg2+//Cl,NO3--H2O,were studied by isothermal method at 25℃ and their phase diagrams were plotted.In the equilibrium phase diagram of quaternary system Na+,K+,Mg2+//NO3--H2O, there are one invariant point,three univariant curves and three regions of crystallization with one salt:NaNO3, KNO3 and Mg(NO3)2·6H2O.In the equilibrium phase diagram of quaternary system K+,Mg2+//Cl,NO3--H2O,there are three invariant points,seven univariant curves and five regions of crystallization with one salt:KNO3,KCl, Mg(NO3)2·6H2O,MgCl2·6H2O and KCl·MgCl2·6H2O.In the equilibrium phase diagram of the quinary system Na+, K+,Mg2+//Cl,NO3--H2O,there are four invariant points,and seven regions of crystallization with one salt:NaCl, KCl,NaNO3,KCl·MgCl2·6H2O,KNO3,MgCl2·6H2O and Mg(NO3)2·6H2O.

Key words: quinary system, phase equilibrium, nitrate, solubility

摘要: The solubilities of the quinary system Na+,K+,Mg2+//Cl,NO3--H2O and its two quaternary subsystems, Na+,K+,Mg2+//NO3--H2O and K+,Mg2+//Cl,NO3--H2O,were studied by isothermal method at 25℃ and their phase diagrams were plotted.In the equilibrium phase diagram of quaternary system Na+,K+,Mg2+//NO3--H2O, there are one invariant point,three univariant curves and three regions of crystallization with one salt:NaNO3, KNO3 and Mg(NO3)2·6H2O.In the equilibrium phase diagram of quaternary system K+,Mg2+//Cl,NO3--H2O,there are three invariant points,seven univariant curves and five regions of crystallization with one salt:KNO3,KCl, Mg(NO3)2·6H2O,MgCl2·6H2O and KCl·MgCl2·6H2O.In the equilibrium phase diagram of the quinary system Na+, K+,Mg2+//Cl,NO3--H2O,there are four invariant points,and seven regions of crystallization with one salt:NaCl, KCl,NaNO3,KCl·MgCl2·6H2O,KNO3,MgCl2·6H2O and Mg(NO3)2·6H2O.

关键词: quinary system, phase equilibrium, nitrate, solubility