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用等温溶解平衡法研究了四元体系K+,Na+∥Cl-,Br--H2O 348K条件下的相平衡关系,测定了该交互四元体系在相应温度条件下平衡溶液的溶解度和密度,并根据相平衡实验数据绘制了相应的相图。研究结果表明:四元体系K+,Na+∥Cl-,Br--H2O348K条件下属于固溶体型,相图中含有1条单变量曲线,2个平衡固相结晶区,无共饱和点。其平衡固相分别为固溶体K(Cl,Br)和Na(Cl,Br),其中固溶体K(Cl,Br)结晶区较大,固溶体Na(Cl,Br)结晶区较小。与同体系313K条件下的相图相比,348K时固溶体Na(Cl,Br).2H2O结晶区消失。
The equilibrium relationship of the quaternary system K +, Na + ∥Cl- and Br - H2O 348K was studied by the isothermal dissolution equilibrium method. The solubility and density of the equilibrium quaternary system at the corresponding temperature were measured. Phase equilibrium experimental data draw the corresponding phase diagram. The results show that the quaternary system belongs to solid solution under the condition of K +, Na + ∥Cl- and Br - H2O348K. The phase diagram contains one univariate curve and two equilibrium solid phase crystallization zones with no common saturation point. The equilibrium solid phases are solid solution K (Cl, Br) and Na (Cl, Br), respectively. The solid solution K (Cl, Br) has a large crystal area and the solid solution Na (Cl, Br) Compared with the phase diagram of the same system 313K, the solid solution of Na (Cl, Br) .2H2O disappeared at 348K.