五元体系Li^+,K^+//CO_3^(2-),SO_4^(2-),B_4O_7^(2-)-H_2O 273K介稳相平衡研究  

A Study on the Metastable Equilibria of the Quinary System Li^+,K^+//CO_3^(2-),SO_4^(2-),B_4O_7^(2-)-H_2O at 273K

作　　者：桑世华[1,2] 雷泞菲[1,2] 崔瑞芝[1,2] 曲树栋[1] 

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059 [2]矿产资源化学四川省高校重点实验室,四川成都610059

出　　处：《高校化学工程学报》2014年第1期21-26,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金资助项目(41373062;40303010;40973047);高等学校博士学科点专项科研基金(2012 5122110015);四川省青年科技创新团队资助项目

摘　　要：采用等温蒸发法研究了五元体系Li+、K+//CO32-、SO42-、B4O72-、H2O 273 K介稳相平衡关系,测定了它们在273 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该五元体系在273 K条件下Li2CO3饱和的介稳平衡相图(干盐投影图和水含量图)。研究结果表明该五元体系介稳平衡中有复盐K2SO4-Li2SO4生成,其低温273 K时介稳相图中有4个共饱点和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。对该五元体系在288 K和273 K时的介稳平衡相图进行了比较和讨论。An experimental study on metastable equilibria of the quinary system Li＋, K＋//CO32-, SO42-, B4O72--H2O at 273 K was made by isothermal evaporation method. Metastable equilibrium solubilities and densities of the solution were determined experimentally. Using the experimental data, the metastable equilibrium phase diagrams （dry-salt phase diagram and water content diagram） were plotted. The experimental results show that the double salt K2SO4·Li2SO4 is formed in the quinary system Li＋, K＋//CO32-, SO42-, B4O72--H2O at 273 K. And it was found that the metastable equilibrium phase diagram has four invariant points, nine univariant curves, and six fields of crystallization saturated with Li2CO3 corresponding to LiBO2·8H2O, K2B4O7·4H2O , K2CO3·3/2H2O,K2SO4,K2SO4·Li2SO4 and Li2SO4·H2O. The comparison and discussion between the metastable phase diagram for the quinary system Li＋, K＋//CO32-, SO42-, B4O72--H2O at 273 K and at 288 K were made.

关 键 词：介稳相平衡 碳酸盐 硫酸盐 硼酸盐 溶解度 

分 类 号：O642.42[理学—物理化学]