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The efficiency of reduction-roasting/magnetic separation of hematite, goethite and any extremely finegrained iron ore, which is non-responsive to conventional processing techniques, is reviewed. Roasting equipment, roasting mechanism, superior results over conventional techniques, and certain advantages are highlighted. Previous works on solid state diffusion theory and gas diffusion theory, in the direction of explaining the mechanism of iron ore reduction are indicated. The transformation of hematite to magnetite, wüstite, and metallic iron, with a reductant, at elevated temperature, is established by XRD analysis.
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G. G. O. O. Uwadiale (1992) studied this question.
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