中文摘要：

研究了298 K下,五元体系Na＋,K＋//Clˉ,SO42ˉ,NO3ˉ-H2O的液固介稳相平衡。采用等温蒸发法确定了溶液的介稳平衡溶解度。根据实验数据,绘制出了该体系介稳相图中氯化钠介稳饱和区以及氯化钠饱和条件下的介稳相平衡投影相图。相图中,有四个四盐共饱的零变量点、九个三盐共饱的单变量线和六个两盐结晶区：Na2SO4·Na NO3·H2O＋Na Cl,3K2SO4·Na2SO4＋Na Cl,Na NO3＋Na Cl,KNO3＋Na Cl,Na2SO4＋Na Cl和KCl＋Na Cl。该体系在298 K下的介稳相图和稳定平衡相图存在一定的差别,复盐3K2SO4·Na2SO4的结晶区明显缩小。

英文摘要：

An experimental study on metastable equilibria of a quinary system Na^＋, K^＋//Cl. SO4^2-, NO3^--H2O at 298 K was performed using an isothermal evaporation method. Metastable equilibrium solubilities were determined experimentally, and the metastable equilibrium phase diagram under the condition saturated with NaCl was plotted. The results show that there are four invariant points, nine univariant curves and six regions of crystallization： Na2SO4·NaNO3·H2O ＋ NaCl, NaNO3 ＋ NaCl, 3K2SO4·Na2SO4 ＋ NaCl, KNO3 ＋ NaCl, Na2SO4 ＋ NaCl and KCl ＋ NaCl. Some differences were found between the metastable diagram and the stable phase diagram at 298 K, and the crystallization regions of 3K2SO4·Na2SO4 become smaller.