ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Effects of Preoxidation of Titania-Ferrous Ore on the Ore Structure and Reduction Behavior
Eungyeul ParkOleg Ostrovski
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2004 Volume 44 Issue 1 Pages 74-81

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Abstract

The paper examined an effect of preoxidation of titania-ferrous ore (New Zealand ironsand) on the ore structure and reduction by carbon monoxide.
The major phase in ironsand is titanomagnetite, Fe3O4-Fe2TiO4 solid solution, with spinel cubic structure. In the non-isothermal preoxidation titanomagnetite was oxidized to cubic maghemite and then transformed to rhombohedral titanohematite, Fe2O3-FeTiO3 solid solution. Isothermal preoxidation of the ironsand at 1 273 K transformed titanomagnetite to titanohematite and partly to pseudobrookite (Fe2TiO5), however, complete oxidation of Fe2+ to Fe3+ in titanomagnetite was not achieved in the experimental condition.
The reduction of the titania-ferrous ore was investigated in non-isothermal and isothermal experiments using 75vol%CO-25vol%Ar gas mixtures in a laboratory fixed bed reactor. Samples in the course of reduction were characterized using XRD and EPMA. Preoxidation increased the rate of ironsand reduction.

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