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研究了两个三元体系Li＋，K＋／SO4（－2）－H2O（1）和Li＋，Mg（2＋）／SO4（2－）－H2O（2）在25℃时的相关系和溶液密度、粘度、折光率、电导、pH等物化性质．体系（1）25℃等温图由三条溶解度线构成，分别对应于K2SO4、复盐LiKSO4和Li2SO4·H2O相区．复盐LiKSO425℃时为不相称溶解化合物，其转变温度为45．5～46℃，高于此温度时变为相称溶解．复盐与LiSO4无固溶体形成．体系（2）为简单共饱型，两段溶解度线对应于体系的两种原始组分Li2SO4·H2O和MgSO4·7H2O的结晶区，无复盐或固溶体形成，亦未发生脱水作用．用Pitzer模型检验测得的两个体系25℃的溶解度，并用经验或半经验公式描述物化性质随浓度的变化规律，其结果令人满意．
The relationships and solution densities of Li +, K + / SO4 (-2) -H2O (1) and Li +, Mg (2 +) / SO4 (2 -) - H2O (2) Viscosity, refractive index, conductance, pH and other physical and chemical properties. System (1) 25 ℃ isotherm consists of three solubility lines, respectively corresponding to K2SO4, double salt LiKSO4 and Li2SO4 · H2O phase region. Double salt LiKSO4 at 25 ℃ is not equal dissolved compounds, the transition temperature is 45.5 ~ 46 ℃, above which the temperature becomes symmetrical dissolution. Double salt and LiSO4 solid solution is not formed. In the system (2), simply saturated, the two solubility curves correspond to the crystalline regions of Li 2 SO 4 .H 2 O and MgSO 4 .7H 2 O, which are the two primary components of the system. There is no double salt or solid solution, nor dehydration. The Pitzer model was used to test the solubility of the two systems at 25 ℃. The empirical or semi-empirical formula was used to describe the change of physico-chemical properties with concentration. The results were satisfactory.