无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2016, Vol. 48 ›› Issue (7): 13-.

• 论文 • 上一篇    下一篇

273.15 K下四元体系Li+,Mg2+∥ Cl-,SO42--H2O相平衡研究

任效京,黄雪莉   

  1. 新疆煤炭洁净转化与化工过程重点实验室,新疆大学化学化工学院,新疆乌鲁木齐 830046
  • 出版日期:2016-07-10 发布日期:2016-07-25

Phase equilibria in the quatemary system of Li+,Mg2+∥Cl-,SO42--H2O at 273.15 K

 REN  Xiao-Jing, HUANG  Xue-Li   

  1. Key Laboratory of Xinjiang Coal Clean Conversion and Chemical Process,College of Chemistry and
    Chemical Engineering,Xinjiang University,Urumqi 830046,China
  • Published:2016-07-10 Online:2016-07-25

摘要: 采用等温溶解平衡法研究了273.15 K下四元体系Li+,Mg2+∥Cl-,SO42--H2O的相平衡关系。测定了该体系各种盐类的溶解度及溶液密度, 并绘制相图。研究结果表明:273.15 K下四元体系Li+,Mg2+∥Cl-,SO42--H2O等温相图有5个单盐结晶区(Li2SO4·H2O,MgSO4·7H2O,LiCl·2H2O, LiCl·MgCl2·7H2O,MgCl2·6H2O);7条单变量线和3个共饱点。与该体系下298.15 K相图相比,MgSO4·7H2O结晶区变大;Li2SO4·H2O和MgCl2·6H2O结晶区明显减小;LiCl·MgCl2·7H2O和LiCl·2H2O结晶区比较小,减小不明显。温度对硫酸盐结晶区的影响较大。

关键词: 锂, 溶解度, 相平衡

Abstract: The liquid-solid phase equilibria of the quaternary system Li+,Mg2+∥Cl-,SO42--H2O were investigated by isothermal method at 273.15 K.Solubilities and densities of the quaternary system were determined experimentally.Then the equilibrium phase diagrams were plotted. Results showed that there were five crystalline regions with one salt corresponding to Li2SO4·H2O,MgSO4·7H2O,LiCl·2H2O,LiCl·MgCl2·7H2O,and MgCl2·6H2O;seven univariate curves with two salts and three invari- ant points with three salts.Compared with the phase diagram of the quaternary system at 298.15 K,the crystalline region of MgSO4·7H2O became larger,the crystalline regions of Li2SO4·H2O and MgCl2·6H2O became smaller obviously;the crystalline regions of LiCl·2H2O and LiCl·MgCl2·7H2O were small,and little reduced.The effect of temperature on the crystalline region of sulfates was great.

Key words: lithium, solubility, phase equilibrium

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