The oxidation of llmenite and its relationship to the FeO-Fe2O3-TiO2 phase diagram at 1073 and 1140 K

Randall A. Briggs, Albert Sacco

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Abstract

The oxidation of synthetic ilmenite was investigated in the temperature range of 1048 to 1273 K using a continuous flow electrobalance, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The phases observed and their relative distribution in partially oxidized samples were related to the FeO-Fe2O3-TiO2 phase diagrams at 1073 and 1140 K. Initial stages of oxidation were characterized by the formation of rutile and ilmenite-hematite solutions containing up to 10 mole pct hematite at 1073 K and 7 mole pct at 1140 K. Final stages of oxidation included the formation of ferropseudobrookite-pseudobrookite solutions containing up to 56 mole pct ferropseudobrookite at 1073 K and up to 66 mole pct ferropseudobrookite at 1140 K. Although not all of the predicted phase fields were observed during oxidation, generally the expected oxidation sequences were followed.

Original languageEnglish
Pages (from-to)1257-1264
Number of pages8
JournalMetallurgical Transactions A
Volume24
Issue number6
DOIs
StatePublished - Jun 1993

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