Abstract
The relation between the phase relations and the equilibrium partial pressures of oxygen in the Ti-Fe-O ternary system has been determined at 1, 273 K using a thermogravimetric method in CO-CO2 gas mixtures and also X-ray diffraction technique for quenched samples after the equilibrium. The possibility of upgrading natural ilmenite ore to a rutile substitute has been discussed and confirmed thermodynamically. The standard Gibbs energy of the reactions at 1, 273 K were also obtained as follows:Fe (s) +FeTiO3 (s) +1/2O2 (g) =Fe2TiO4 (s), -190.9kJ·mol-1, Fe (s) +TiO2 (s) + 1/2O2 (g) =FeTiO3 (s), -202.3kJ·mol-1.Activities of magnetite show negative deviations from Raoult's law in the Fe3O4-Fe2TiO4 solid solutions coexisting with metallic iron at 1, 173-1, 373 K.
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