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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (06): 476-480. 上一篇    下一篇

研究论文

五元体系Li＋, K＋//, CO32- ,SO42- , B4O72- -H2O在288 K时的介稳相平衡研究

桑世华，张晓，赵相颇，肖龙军   

  1. (成都理工大学材料与化学化工学院 成都 610059)
  • 投稿日期:2009-02-19 修回日期:2009-09-09 发布日期:2010-03-28
  • 通讯作者: 桑世华 E-mail:sangsh@cdut.edu.cn;sangshihua@sina.com.cn

Metastable Equilibria in the Quinary System of Li＋, K＋//, , CO32- ,SO42- , B4O72, -H2O at 288 K

Sang Shihua* Zhang Xiao Zhao Xiangpo Xiao Longjun   

  1. (College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059)
  • Received:2009-02-19 Revised:2009-09-09 Published:2010-03-28
  • Contact: 桑世华 E-mail:sangsh@cdut.edu.cn;sangshihua@sina.com.cn

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采用等温蒸发法研究了五元体系Li＋, K＋//, , -H2O 在288 K时的介稳相平衡关系, 测定了该五元体系在288 K条件下的介稳平衡的溶解度和溶液密度, 根据实验数据绘制了相应的介稳平衡相图和水图. 相平衡研究结果表明该五元体系介稳相平衡中有复盐K2SO4•Li2SO4生成, 其介稳相图(Li2CO3饱和)有4个共饱和点, 9条单变量曲线, 6个Li2CO3饱和的结晶区分别为LiBO2•8H2O, K2B4O7•4H2O, K2CO3•3/2H2O, K2SO4, Li2SO4•H2O和复盐 K2SO4•Li2SO4.

关键词: 介稳相平衡, 碳酸盐, 硫酸盐, 硼酸盐, 溶解度

An experimental study on metastable equilibria at 288 K in the quinary system Li＋, K＋//, , -H2O was done by an isothermal evaporation method. Metastable equilibrium solubilities and densities of the solution were determined experimentally. Using the experimental data, the metastable equilibrium phase diagram and water diagram were plotted, respectively. The experimental results of the metastable equilibria show that the double salt K2SO4•Li2SO4 has been formed in the quinary system Li＋, K＋//, , -H2O at 288 K. In the metastable equilibrium phase diagram (saturated with Li2CO3), the quinary system has four invariant points, nine univariant curves, six fields of crystallization saturated with Li2CO3 [LiBO2•8H2O, K2B4O7•4H2O, K2CO3•3/2H2O, K2SO4, K2SO4•Li2SO4 and Li2SO4•H2O].

Key words: metastable equilibrium, carbonate, sulfate, borate, solubility