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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (22): 2247-2253. 上一篇    下一篇

研究论文

Li＋, Na＋//SO42－, CO32－-H2O交互四元体系288 K介稳相平衡研究

桑世华*, 殷辉安, 曾英, 刘凤英   

  1. (成都理工大学材料与化学化工学院 成都 610059)
  • 投稿日期:2005-09-08 修回日期:2006-02-06 发布日期:2006-11-28
  • 通讯作者: 桑世华

Study on Metastable Equilibria in Quaternary System Li＋, Na＋// SO42－, CO32－-H2O at 288 K

SANG Shi-Hua*; YIN Hui-An; ZENG Ying; LIU Feng-Ying   

  1. (College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059)
  • Received:2005-09-08 Revised:2006-02-06 Published:2006-11-28
  • Contact: SANG Shi-Hua

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采用等温蒸发法研究了四元体系Li＋, Na＋// SO42－, CO32－-H2O 288 K介稳相平衡及平衡液相的密度、电导率、折光率、粘度和pH值, 测定了该四元体系288 K条件下介稳平衡溶液溶解度及物化性质. 根据实验数据绘制了相应的介稳相图. 研究发现: 该体系介稳平衡中有复盐Na3Li(SO4)2•6H2O形成. 其介稳相图中有3个共饱点, 7条单变量曲线, 平衡固相为: Li2SO4•H2O, Na2SO4, Na3Li(SO4)2•6H2O, Li2CO3, Na2CO3•10H2O. 复盐Na3Li(SO4)2•6H2O和一水硫酸锂(Li2SO4•H2O)的结晶区较小, 而Li2CO3的结晶区最大; 该四元体系介稳平衡条件下未发现Na2SO4•10H2O的结晶区.

关键词: 介稳相平衡, 碳酸盐, 硫酸盐, 溶解度

An experimental study on metastable equilibria at 288 K in the quaternary system Li＋, Na＋//SO42－, CO32－-H2O was done by isothermal evaporation method. Metastable equilibrium solubilities and physico-chemical properties such as density, conductivity, pH, refractive index and viscosity of the solution were determined experimentally. The experimental results of the metastable equilibria show that the double salt [Na3Li(SO4)2•6H2O] forms in the quaternary system Li＋, Na＋//SO42－, CO32－-H2O at 288 K. According to the experimental data, the metastable equilibrium phase diagram and the physico-chemical composition diagram were plotted. In the metastable phase diagram, the quaternary system has three invariant points, seven univariant curves, five fields of crystallization [Li2SO4•H2O, Na2SO4, Li2CO3, Na2CO3•10H2O, Na3Li(SO4)2•6H2O]. The double salt Na3Li(SO4)2•6H2O and Li2SO4•H2O have smaller crystallization fields than the others. The crystallization field of Na2SO4•10H2O was not found in the metastable equilibria.

Key words: metastable equilibrium, carbonate, sulfate, solubility