Fluidized bed type fine iron ore reducing apparatus, and...

C - Chemistry – Metallurgy – 21 – B

Patent

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Details

C21B 13/14 (2006.01) C21B 13/00 (2006.01)

Patent

CA 2320242

A fluidized bed type reducing apparatus for reducing a fine iron ore of a wide particle size distribution includes a first fluidized bed type furnace (210) for a first reduction of only coarse/intermediate iron ores and a second fluidized bed type furnace (220) for the reduction of the iron ores of the first fluidized bed type furnace (210). A first cyclone (240) captures fine iron ore particles from the discharge gas of the first fluidized bed type furnace (210) and a second cyclone (250) captures those from that of the second fluidized bed type furnace (220). In a third fluidized bed type furnace (230) the fine iron ore particles are reduced which have been captured by the first and second cyclones (240 and 250). A third cyclone (260) captures the extremely fine iron ore particles discharged from the third fluidized bed type furnace (230) to recycle them to the third fluidized bed type furnace (230).

L'invention concerne un appareil de réduction de type à lit fluidisé destiné à la réduction de minerai fin à large dimension des particules, l'appareil comprenant un premier (210) four de type à lit fluidisé destiné à une première réduction de minerais de fer grossiers/intermédiaires uniquement et un deuxième (220) four de type à lit fluidisé destiné à la réduction des minerais de fer du premier (210) four de type à lit fluidisé. Un premier cyclone (240) capture les particules fines de minerai de fer provenant du gaz d'évacuation du premier (210) four de type à lit fluidisé et un deuxième cyclone (250) capture celles provenant du gaz d'évacuation du deuxième (220) four de type à lit fluidisé. Dans un troisième (230) four de type à lit fluidisé, les particules fines de minerai de fer capturées par les premier et deuxième cyclones (240, 250) sont réduites. Un troisième cyclone (260) capture les particules de minerai de fer très fines évacuées du troisième (230) four de type à lit fluidisé pour les recycler dans le troisième (230) four de type à lit fluidisé.

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