298K时三元体系MeSO_4-(NH_4)_2SO_4-H_2O的相平衡  

Equilibrium Solubility in Ternary System of MeSO_4-(NH_4)_2SO_4-H_2O at 298 K

作　　者：慕思国[1] 彭长宏[1] 黄虹[1] 唐谟堂[1] 

机构地区：[1]中南大学冶金科学与工程学院环境工程研究所,湖南长沙410083

出　　处：《过程工程学报》2006年第1期32-36,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50444020);863计划资环领域资助项目(编号:2002AA649220)

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.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-H20, there were 3 saturation curves given by （NH4）2Zn（SO4）2·6H2O, ZnSO4·TH2O and （NH4）2SO4, respectively. There were 2 co-saturation points, C having the composition of （NH4）2Zn（SO4）2·6H2O and ZnSO4·TH2O, 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·TH2O, 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 Fe^2＋, Mn^2＋ and Zn^2＋, etc., but also establish foundation for study on the quarternary system consisting of Fe^2＋, Mn^2＋, Zn^2＋ and NH4^＋/SO4^2--H2O.

关 键 词：溶解度 水盐体系 相平衡 

分 类 号：O642.4[理学—物理化学] TQ136.1[理学—化学]