【摘要】 用等温溶解平衡法研究了298K时MeSO4?(NH4)2SO4?H2O三元体系的溶解度,并绘制了平衡相图.结果表明,在MnSO4?(NH4)2SO4?H2O体系中,有MnSO4?H2O,(NH4)2Mn(SO4)2?6H2O和(NH4)2SO43条饱和曲线,组成为MnSO4?H2O和(NH4)2Mn(SO4)2?6H2O及(NH4)2Mn(SO4)2?6H2O和(NH4)2SO4的2个共饱和点,以及平衡固相为(NH4)2SO4,(NH4)2Mn(SO4)2?6H2O和MnSO4?H2O的3个纯盐结晶区.在ZnSO4?(NH4)2SO4?H2O体系中,有(NH4)2Zn(SO4)2?6H2O,ZnSO4?7H2O与(NH4)2SO43条饱和曲线,组成为(NH4)2Zn(SO4)2?6H2O和ZnSO4?7H2O及(NH4)2SO4和(NH4)2Zn(SO4)2?6H2O的2个共饱和点,以及平衡固相为(NH4)2Zn(SO4)2?6H2O,ZnSO4?7H2O和(NH4)2SO4的3个纯盐结晶区.在(NH4)2SO4?FeSO4?H2O体系中,有(NH4)2Fe(SO4)2?6H2O,FeSO4?7H2O和(NH4)2SO4的3条饱和曲线,组成为(NH4)2Fe(SO4)2?6H2O和FeSO4?7H2O及(NH4)2Fe(SO4)2?6H2O和(NH4)2SO4的2个共饱和点,以及平衡固相为(NH4)2Fe(SO4)2?6H2O,FeSO4?7H2O和(NH4)2SO4的3个纯盐结晶区.研究结果既为含Fe2+,Mn2+和Zn2+溶液的复盐沉淀深度净化提供了理论指导,同时也为四元体系的研究奠定了基础.更多还原

【Abstract】 The phase equilibrium in the ternary system of MeSO4?(NH4)2SO4?H2O at 298 K was studied by isothermal equilibrium method and many significant experimental results were obtained. In the ternary system of MnSO4?(NH4)2SO4?H2O, there were 3 saturation curves given by MnSO4?H2O, (NH4)2Mn(SO4)2?6H2O and (NH4)2SO4, respectively. There were 2 co-saturation points, A having the composition of MnSO4?H2O and (NH4)2Mn(SO4)2?6H2O, and B given by (NH4)2Mn(SO4)2?6H2O and (NH4)2SO4. There were 3 purification crystallization areas given by (NH4)2Mn(SO4)2?6H2O, MnSO4?H2O and (NH4)2SO4, respectively. In the ternary system of ZnSO4?(NH4)2SO4?H2O, there were 3 saturation curves given by (NH4)2Zn(SO4)2?6H2O, ZnSO4?7H2O and (NH4)2SO4, respectively. There were 2 co-saturation points, C having the composition of (NH4)2Zn(SO4)2?6H2O and ZnSO4?7H2O, and D given by (NH4)2SO4 and (NH4)2Zn(SO4)2?6H2O, respectively. There were 3 purification crystallization areas given by (NH4)2Zn(SO4)2·6H2O, ZnSO4?7H2O and (NH4)2SO4, respectively. In the ternary system of FeSO4?(NH4)2SO4?H2O, there were 3 saturation curves given by (NH4)2Fe(SO4)2·6H2O, FeSO4?7H2O and (NH4)2SO4, respectively. There were 2 co-saturation points, E having the composition of (NH4)2Fe(SO4)2?6H2O and FeSO4?7H2O, and F given by (NH4)2Fe(SO4)2?6H2O and (NH4)2SO4, respectively. There were 3 purification crystallization areas of FeSO4?7H2O, (NH4)2Fe(SO4)2?6H2O and (NH4)2SO4, respectively. These experimental results gained above not only give theoretical guidance for the double-salt precipitation deep purification of such solutions containing Fe2+, Mn2+ and Zn2+, etc., but also establish foundation for study on the quarternary system consisting of Fe2+, Mn2+, Zn2+ and NH4+/SO42??H2O.更多还原