高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (6): 968.

• 论文 • 上一篇    下一篇

五元交互体系Li+,Na+,K+//CO32-,Cl--H2O在298.15K的相平衡研究

曾英, 殷辉安, 唐明林, 冯小向   

  1. 成都理工大学材料与生物工程学院, 成都 610059
  • 收稿日期:2002-06-14 出版日期:2003-06-24 发布日期:2003-06-24
  • 通讯作者: 曾英(1968年出生),女,博士,副教授,主要从事化工热力学和动力学研究.E-mail:zengy@cdut.edu.cn E-mail:zengy@cdut.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:49773200#);国土资源部“九·五”重点学科生长点基金资助

A Study of the Phase Equilibrium for Quinary System Li+, Na+, K+//CO32-, Cl--H2O at 298.15 K

ZENG Ying, YIN Hui-An, TANG Ming-Lin, FENG Xiao-Xiang   

  1. College of Materials and Biological Engineering, Chengdu University of Technology, Chengdu 610059, China
  • Received:2002-06-14 Online:2003-06-24 Published:2003-06-24

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摘要： 针对西藏扎布耶盐湖卤水组成,采用等温溶解平衡法研究了五元交互体系Li+,Na+,K+//CO32-,Cl--H2O于298.15K时的相平衡,并绘制了相图(空间立体图和Li2CO3饱和的投影图).结果表明,该五元体系相图含有7个结晶区、13条单变量线和4个无变量点.7个结晶区由6个单盐结晶区和1个复盐结晶区组成,分别为LiCl·H2O,NaCl,KCl,Li2CO3,K2CO3·3/2H2O,Na2CO3·10H2O和NaKCO3·6H2O,没有形成固溶体和天然碱(Na2CO3·NaHCO3·2H2O).4个无变量点标记成K1,K2,K3和K4,所对应的平衡固相盐分别是:Li2CO3+NaKCO3·6H2O+Na2CO3·10H2O+KCl,Li2CO3+NaKCO3·6H2O+K2CO3·3/2H2O+KCl,Li2CO3+NaCl+KCl+LiCl·H2O和Li2CO3+NaCl+Na2CO3·10H2O+KCl.

关键词: 相平衡, 五元体系, 锂盐, 钾盐

Abstract: Zabuye Saline Lake, Tibet, P. R. China, is unrivalled in the world for its high concentration of chloride, sulfate, carbonate and borate of lithium, sodium and potassium. In accordance with the composition of the brine, the phase equilibrium of quinary system Li+, Na+, K+//CO32-, Cl--H2O at 298.15 K were studied by isothermal method, from which the phase diagram (stereo-diagram and projected-diagram which were saturated with Li2CO3) were drawn. The phase diagram of this quinary system consists of seven crystallization fields, thirteen univariant curves and four invariant points. Seven crystallization fields correspond to six single-salt crystallization fields and one complex salt crystallization, that are LiCl·H2O, NaCl, K2Cl2, Li2CO3, K2CO3·3/2H2O, Na2CO3·10H2O and complex salt NaKCO3·6H2O. The crystallization region of trona (Na2CO3·NaHCO3·2H2O) or solid solution is not found in this quinary system. The composition of equilibrium solid phase for four invariant points (K1, K2, K3, K4) is as follows: Li2CO3+NaKCO3·6H2O+Na2CO3·10H2O+KCl for K1, Li2CO3+NaKCO3·6H2O+K2CO3·3/2H2O+KCl for K2, Li2CO3+NaCl+KCl+LiCl·H2O for K3, Li2CO3+NaCl+Na2CO3·10H2O+KCl for K4, respectively.

Key words: Phase equilibrium, Quinary system, Lithium salt, Potassium salt

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