K_2B_4O_7-Na_2B_4O_7-Li_2B_4O_7-H_2O四元体系288K相平衡研究  

Equilibrium Solubilities and Properties of the Quarternary System K_2B_4O_7-Na_2B_4O_7-Li_2B_4O_7-H_2O at 288K

作　　者：桑世华[1] 唐明林[1] 殷辉安[1] 张允湘[2] 

机构地区：[1]成都理工大学应用化学系,四川成都610059 [2]四川大学化工学院,四川成都610064

出　　处：《化学工程》2003年第4期68-70,6,共3页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目 (4 9773 2 0 0 )

摘　　要：采用等温溶解平衡法研究了K2 B4O7 Na2 B4O7 Li2 B4O7 H2 O四元体系在 2 88K时的相平衡及平衡液相的主要物化性质(密度、电导率、pH值 )。研究发现 :该四元体系为简单共饱和型 ,无复盐及固溶体形成 ,根据溶解度数据绘制了相图 ,相图中有一个共饱点E ,三条单变度曲线E3 E ,E2 E ,E1 E ;三个结晶区平衡固相分别为K2 B4O7·4H2 O ,Na2 B4O7·10H2 O和Li2 B4O7·3H2 O。实验结果表明K2 B4O7对Na2 B4O7有增溶作用 。The solubilities and properties (density, electrical conductivity and pH) were studied in the quarternary system K 2B 4O 7 Na 2B 4O 7 Li 2B 4O 7 H 2O at 288K by isothermal equilibrium method. Based on the solubility data, the phase diagram of the system was plotted, which consists of one invariant point E .Three univariant curves E1 E,E2 E and E3 E ,and three crystallization fields Na 2B 4O 7·10H 2O, K 2B 4O 7·4H 2O and Li 2B 4O 7·3H 2O.K 2B 4O 7 have salt in effect on Na 2B 4O 7.The results of properties in the solution were discussed briefly.

关 键 词：K2B4O7-Na2B4O7-Li2B4O7-H2O四元体系 288K相平衡 水盐体系 硼酸盐 盐湖卤水 

分 类 号：O642.42[理学—物理化学] TS39[理学—化学]