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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (9): 798-802. 上一篇    下一篇

研究论文

298.16 K Na＋, K＋, Mg2＋//Cl－, NO3－-H2O五元体系的相平衡研究

黄雪莉*,1,2, 朱丽娟2, 梁涛2, 宋彭生3   

  1. (1大连理工大学化工学院 大连 116024)
    (2新疆大学化学化工学院 乌鲁木齐 830046)
    (3中国科学院青海盐湖研究所 西宁 810008)
  • 投稿日期:2006-06-06 修回日期:2006-11-15 发布日期:2007-05-14
  • 通讯作者: 黄雪莉

Study on the Phase Equilibrium for the Quinary System Na＋, K＋, Mg2＋//Cl－, NO3－-H2O at 298.16 K

HUANG Xue-Li*,1,2; ZHU Li-Juan2; LIANG Tao2; SONG Peng-Sheng3   

  1. (1 School of Chemical Engineering, Dalian University of Technology, Dalian 116024)
    (2 College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046)
    (3 Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008)
  • Received:2006-06-06 Revised:2006-11-15 Published:2007-05-14
  • Contact: HUANG Xue-Li

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采用等温溶解平衡法研究了五元体系Na＋, K＋, Mg2＋//Cl－, NO3－-H2O在298.16 K、氯化钠饱和时各盐的溶解度和饱和溶液的物化性质(密度, 电导率)以及四元体系Na＋, Mg2＋//Cl－, NO3－-H2O的相平衡关系. 研究表明: 在298.16 K, 氯化钠饱和时该五元体系溶解度相图由六个结晶区、九条单变量溶解度曲线和四个零变量点构成, 六个结晶区分别对应于NaNO3＋NaCl, KNO3＋NaCl, KCl＋NaCl, Mg(NO3)2•6H2O＋NaCl, MgCl2•6H2O＋NaCl和复盐KCl•MgCl2•6H2O＋NaCl; 在298.16 K时, 该四元体系的相图由四个结晶区、五条单变量溶解度曲线和二个零变量点构成, 四个结晶区分别对应于NaNO3, NaCl, Mg(NO3)2•6H2O, MgCl2•6H2O.

关键词: 五元水盐体系, 相平衡, 物化性质, 溶解度

Solubilities of each salt in the system Na＋, K＋, Mg2＋//Cl－, NO3－-H2O saturated with NaCl and the system Na＋, Mg2＋//Cl－, NO3－-H2O were investigated by isothermal method at 298.16 K. The physico-chemical properties, such as densities and conductivities, of the corresponding solutions were determined too. The dry salt phase diagram of the system Na＋, K＋, Mg2＋//Cl－, NO3－-H2O saturated with NaCl consists of six crystallization regions (NaNO3＋NaCl, KNO3＋NaCl, KCl＋NaCl, Mg(NO3)2•6H2O＋NaCl, MgCl2•6H2O＋NaCl and KCl•MgCl2•6H2O＋NaCl), nine univariant curves and four invariant points. The dry salt phase diagram of the system Na＋, Mg2＋//Cl－, NO3－-H2O consists of four crystallization regions (NaNO3, Mg(NO3)2•6H2O, MgCl2•6H2O and NaCl), five univariant curves and two invariant points.

Key words: quinary system, phase equilibrium, physicochemical property, solubility