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Equilibrium Solubility in Ternary System of MeSO4-(NH4)2SO4-H2O at 298 K
- MU Si-guo;PENG Chang-hong;HUANG Hong;TANG Mo-tang
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. 2006, 6(1):
32-36.
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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.
