Phase relations and equilibrium oxygen partial pressures in the iron-titanium-oxygen system at 1373 K

Osamu Inoue, Satoshi Itoh, Takeshi Azakami

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5 Citations (Scopus)

Abstract

Phase relations and the equilibrium oxygen partial pressures in the Fe-Ti-O ternary system at 1373 K have been studied using a thermogravimetric technique in various atmospheres buffered by a CO-CO2 gas mixture and X-ray diffraction technique. The results indicate that at 1373 K ilmenite (FeTiO3) can be reduced and decomposed to iron and rutile (TiO2). Consequently upgrading ilmenite to a rutile substitute is possible in principle. From the present results, the standard Gibbs energy of the following reactions was calculated to be -184.7, -196.0 kj·mol-1 at 1373 K, respectively. Fe(s)+FeTiO3(s)+1/2O2(g)=Fe2TiO4(s) Fe(s)+TiO2(s)+1/2O2(g)="FeTiO3"(s) Both the activities of magnetite and ulvöspinel in the Fe2TiO4-Fe3O4 spinel solid solutions coexisting with metallic iron at 1373 K obtained exhibit negative deviations from Raoult's law.

Original languageEnglish
Pages (from-to)834-840
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume60
Issue number9
DOIs
Publication statusPublished - 1996

Keywords

  • Activity
  • Ilmenite
  • Iron-titanium-oxygen system
  • Phase equilibria
  • Titanium
  • Upgrading

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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