Autogenous roasting of iron ore

C - Chemistry – Metallurgy – 22 – B

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C22B 1/16 (2006.01) C22B 1/02 (2006.01) C22B 1/04 (2006.01)

Patent

CA 2063075

Iron ore concentrate is converted to magnetic gamma hematite in an autogenous roasting operation which is self-sustaining. The iron ore concentrate is preheated and contained magnetite is oxidized to hematite. Hematite is reduced to magnetite using carbon monoxide. After cooling, the magnetite is oxidatively exothermically converted to magnetic gamma hematite. The thermal energy resulting from the latter step is recycled to the preheating and reduction steps while thermal energy resulting from the cooling step also is recycled to those steps. The magnetic gamma hematite may be subjected to magnetic separation to produce a very low silica high purity iron oxide concentrate, which may be blended with high silica concentrate to provide a pellet feed for making blast furnace feed pellets.

Un concentré de minerai de fer est converti en hématite gamma magnétique par grillage autogène auto-entretenu. Le concentré de minerai de fer est préchauffé, la magnétite qu'il renferme étant oxydée en hématite. L'hématite est réduite en magnétite par le monoxyde de carbone. Après refroidissement, la magnétite est convertie en hématite gamma magnétique par oxydation exothermique. L'énergie thermique provenant de cette dernière étape est recyclée vers les étapes de préchauffage et de réduction; l'énergie thermique provenant de l'étape de refroidissement est elle aussi recyclée vers ces étapes. L'hématite gamma magnétique peut être séparée magnétiquement; on obtiendra ainsi un concentré d'oxyde de fer de grande pureté, à très faible teneur en silice, lequel pourra être mélangé avec du concentré à haute teneur en silice pour former des boulettes servant à alimenter les hauts fourneaux.

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