针对三元水盐体系KBr-K2B4O7-H2O在348 K时溶解度及相平衡规律,采用等温溶解平衡法对该三元体系的相关系进行了详细研究。根据平衡液相的组成绘制了相应温度下的平衡相图。研究发现,该体系属于简单共饱和体系,无复盐和固溶体生成,相图中有1个共饱点、2条溶解度曲线,溶解度曲线对应的平衡固相分别为KBr和K2B4O7·4H2O。实验结果表明,KBr对K2B4O7有较强盐析作用。 According to the solubility and phase balance of ternary salt-water system KBr-K2B4O7-H2O at 348 K, the phase relationship of this ternary system was studied in detail by isothermal dissolution-equilibrium method. Based on the composition of the equilibrium liquid phase, the equilibrium phase diagram of the corresponding temperature is plotted. The results show that this system belongs to the simple co-saturation system and has no double salt and solid solution. The phase diagram has one co-flooding point and two solubility curves. The equilibrium solid phases corresponding to the solubility curves are KBr and K2B4O7 · 4H2O, respectively. The experimental results show that KBr has strong salting-out effect on K2B4O7.