三元体系Li^+,Cs^+//SO_4^(2-)-H_2O 298K稳定相平衡研究

Stable Phase Equilibrium in the Ternary System Li^+,Cs^+//SO_4^(2-)-H_2O at 298K

采用等温溶解平衡法研究了三元体系Li^+,Cs^+//SO_4^(2-)-H_2O 298K稳定相平衡关系。测定了平衡液相各组分溶解度、密度和折光率数据并绘制了相应的等温平衡相图、密度-组成图和折光率-组成图。结果表明:该体系属于复杂体系,有复盐3Li_2SO_4·Cs_2SO_4·2H_2O和Li_2SO_4·Cs_2SO_4形成;其稳定相图由4个固相结晶区、4条单变量曲线和3个相称共饱点组成,4个固相结晶区分别对应Li_2SO_4·H_2O、3Li_2SO_4·Cs_2SO_4·2H_2O、Li_2SO_4·Cs_2SO_4和Cs_2SO_4。

The stable phase equilibria of the ternary system Li +, Cs +// SO 4 2--H 2O at 298 K were studied using isothermal solubility equilibrium method. The solubility, density and refractive index of the equilibrium liquid phase were measured and the corresponding equilibrium phase diagram, density-composition diagram and refractive index-composition diagram were plotted. The results indicated that the system is a complex one with the formation of double salts, such as 3Li 2SO 4·Cs 2SO 4·2H 2O and Li 2SO 4·Cs 2SO 4. The stable phase diagram consists of four solid phase crystallization zones, four univariate curves and three commensurate invariant points. The four solid phase crystallization zones correspond to the salts of Li 2SO 4·H 2O, 3Li 2SO 4·Cs 2SO 4·2H 2O, Li 2SO 4·Cs 2SO 4 and Cs 2SO 4.