Method for thermal treatment of granulated iron ore before...

C - Chemistry – Metallurgy – 22 – B

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C22B 1/16 (2006.01) C21B 13/00 (2006.01)

Patent

CA 2288217

The wet granulated iron ore is initially conducted through a drying zone. The ore leaves the drying zone at a temperature of 120-400 °C. The ore is then heated in direct contact with hot gas to temperatures of 700-1,100 °C before being delivered to a reduction zone. The ore coming out of the drying zone is fully or partially guided through a separating device so as to separate the ore into fine and coarse grain fractions. The fine-grained ore fraction is conveyed to a granulating device so as to produce an iron ore granulate which is conducted to the drying zone. The coarse-grained ore fraction is heated to temperatures of 700-1,100 °C before it is guided into the reduction zone.

Le minerai de fer humide granulé est tout d'abord guidé à travers une zone de séchage, d'où le fer ressort à une température comprise entre 120 et 400 DEG C. Le fer est ensuite mis en contact direct avec un gaz chaud pour être porté à des températures comprises entre 700 et 1100 DEG C, avant d'être placé dans une zone de réduction. Le fer qui sort de la zone de séchage est guidé en totalité ou en partie à travers un dispositif de séparation, pour dissocier le minerai en une fraction à gros grains et en une fraction à grains fins. La fraction à grains fins est placée dans un dispositif de granulation pour produire un granulat de minerai de fer qui est guidé dans la zone de séchage. La fraction à gros grains est portée à des températures comprises entre 700 et 1100 DEG C, avant d'être acheminée dans la zone de réduction.

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