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Abstract Thermodynamic study of the formation of low melting-point Na_2SO_4-Fe_2 (SO_4)_3 was made by equilibrating Fe_2O_3-Na_2SO_4 mixtures with SO_3 of different pressures in the temperature range of 943-1003K. The molar fractions of Fe_2(SO_4)_3 in the molten Na_2SO_4Fe_2(SO_4)_3 were determined by chemical analysis. With the data obtained, the free enthalpy change for the reaction Fe_2O_3 (s)+3SO_3 (g)=Fe_2(SO_4)_3 (1, dissolved in liquid Na_2SO_4)was calculated by means of regular solution approximation as well as Temkin mixing model. The calculated △G°is given as △G°=-116830+141.15T,cal/mol (943～1003K) This was used to estimate the critical partial pressures of SO_3 required for liquid sulfate formation, with the help of the Na_2SO_4-Fe_2(SO_4)_3 phase diagram. For lack of necessary thermodynamic data, the critical partial pressures of SO_3 required for the formation of molten K_2SO_4-Na_2SO_4-Fe_2(SO_4)_3 were determined experimentally.
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Received: 25 February 1992
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