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本文详细报道三元体系ＫＣｌ－Ｋ＿２Ｂ＿４Ｏ＿７－Ｈ＿２Ｏ在２５℃时的相平衡关系，并测定溶液密度，绘制出体系的溶解度图和溶液密度－组成关系图，给出二元共饱和点的溶解度参数。
In this paper, the phase equilibrium of ternary system KCl-K 2 B 4 O 7 -H 2 O at 25 ℃ is reported in detail and the solution density is plotted. The solubility diagram and the solution density-composition diagram of the system are plotted, and the solubility parameter of binary ternary saturation point is given.