Iron(II,III) Oxide - Reactions

Reactions

Reduction of magnetite ore by CO in a blast furnace is used to produce iron as part of steel production process:

Fe3O4 + 4CO → 3Fe + 4CO2

Controlled oxidation of Fe3O4 is used to produce brown pigment quality γ-Fe2O3 (maghemite):

2Fe3O4 + ½ O2 → 3(γ-Fe2O3)

More vigorous calcining, (roasting in air), gives red pigment quality α-Fe2O3 (hematite):

2Fe3O4 + ½ O2 → 3(α-Fe2O3)

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