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采用等温溶解平衡法测定了四元交互体系Ｌｉ～＋，Ｋ～＋／Ｃｌ～－，７５℃的溶解度和平衡溶液的物化性质（密度、粘度、折光率）．该四元交互体系５０，７５℃的溶解度等温图有５个相区：即Ｌｉ＿２ＳＯ＿４·Ｈ＿２Ｏ，ＫＬｉＳＯ＿４，ＫＣｌ，Ｋ＿２ＳＯ＿４，ＬｉＣｌ·Ｈ＿２Ｏ，７条单变量曲线，３个共饱点，其中Ｌｉ＿２Ｏ＿４·Ｈ）２Ｏ＋ＫＣｌ＋ＬｉＣｌ·Ｈ＿２Ｏ为一致零变量点。用我们以往提出的经验公式处理了平衡溶液的密度和折光率，由所测得的溶解度数据，求得了高温和高锂浓度下的电解质溶液Ｐｉｔｚｅｒ模型的离子相互作用参数。计算了各平衡溶液中盐的活度和水的活度。还计算了该四元交互体系２５℃的溶解度，考察了Ｐｉｔｚｅｒ电解质溶液理论在水－盐溶解度计算中的应用。
The solubility of Li ~ +, K ~ + / Cl ~ -, 75 ℃ and the physicochemical properties (density, viscosity and refractive index) of the equilibrium solution were determined by isothermal dissolution equilibrium method. There are five phase regions in the solubility curve at 50,75 ℃: Li_2SO_4 · H_2O, KLiSO_4, KCl, K_2SO_4, LiCl · H_2O, seven univariate curves and three co-flooding points, of which Li 2 O 4 · H ) 2O + KCl + LiCl · H_2O for consistent zero point. The density and refractive index of the equilibrated solution were treated by our empirical formula, and the ion-interaction parameters of the Pitzer model for the electrolyte solution were obtained from the measured solubility data. Salt activity and water activity were calculated for each balance solution. The solubility of the quaternary system at 25 ℃ was also calculated. The application of Pitzer electrolyte solution theory in water - salt solubility calculation was investigated.