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采用等温溶解平衡法研究298.16K时四元体系K+,Mg2+//Cl-,NO-3-H2O的液固相平衡关系,测定了溶解度数据,并绘制出平衡相图。研究表明,在298.16K时,该体系相图有5个单盐结晶区、6条单变量溶解度曲线和3个零变量点。5个单盐结晶区分别对应于KNO3、KCl、Mg(NO3)2.6H2O、MgCl2.6H2O和复盐KCl.MgCl2.6H2O,其中KNO3的结晶区最大,MgCl2.6H2O的结晶区最小。
The isothermal solution equilibrium method was used to study the liquid-solid equilibrium relationship of quaternary system K +, Mg2 + / Cl- and NO-3-H2O at 298.16K. The solubility data were measured and the equilibrium phase diagram was drawn. The study shows that at 298.16K, the system has five single salt crystallization zone, six univariate solubility curves and three zero-point points. The five single salt crystallization zones correspond to KNO3, KCl, Mg (NO3) 2.6H2O, MgCl2.6H2O and double salt KCl.MgCl2.6H2O respectively, of which KNO3 has the largest crystallization zone and MgCl2.6H2O has the smallest crystallization zone.