TY - JOUR
T1 - Phase equilibria in the titanium-iron-oxygen system in the temperature range of 1173 to 1373 K
AU - Itoh, Satoshi
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1999
Y1 - 1999
N2 - 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 1173, 1273 and 1373 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 Raoult's law in the Fe3O4-Fe2TiO4 spinel solid solutions coexisting with metallic iron in the temperature range of 1173 to 1373 K.
AB - 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 1173, 1273 and 1373 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 Raoult's law in the Fe3O4-Fe2TiO4 spinel solid solutions coexisting with metallic iron in the temperature range of 1173 to 1373 K.
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U2 - 10.2355/isijinternational.39.1107
DO - 10.2355/isijinternational.39.1107
M3 - Article
AN - SCOPUS:0033341379
VL - 39
SP - 1107
EP - 1115
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 11
ER -