Phase Equilibria in the Titanium-Iron-Oxygen System in the Temperature Range of 1 173 to 1 373 K

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概要

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• Phase relations and the equilibrium partial pressures of oxygen in the titanium-iron-oxygen ternary system have been studied in the temperature range of 1173 to 1373 K by means of a thermogravimetric method in a CO-CO2 gas mixture and X-ray diffraction technique for the quenched samples after the equilibrium experiments. The objective of the present work is both to clarify the relation between the phase relations in the Ti-Fe-O ternary system and the equilibrium partial pressures of oxygen, and to discuss the possibility of upgrading natural ilmenite ore to a rutile substitute for extractive metallurgy of titanium. The results are summarized as follows: The phase diagram and isobars of oxygen in the titanium-iron-oxygen ternary system at 1 173, 1 273 and 1 373 K have been determined. It was found from the present results that upgrading ilmenite (FeTiO3) to a rutile (TiO2) substitute is thermodynamically possible. Both the activities of magnetite and ulvospinel show negative deviations from Raoults law in the Fe3O4-Fe2TiO4 spinel solid solutions coexisting with metallic iron in the temperature range of 1173 to 1373 K.

• 社団法人 日本鉄鋼協会の論文
• 1999-11-15

著者

• Itoh Satoshi

  Department Of Metallurgy Graduate School Of Engineering Tohoku University

• Itoh Satoshi

  Department Of Cardiovascular Surgery Saitama Medical Center Jichi Medical University

• ITOH Satoshi

  Department of Metallurgy, Graduate School of Engineering, Tohoku University

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