2-stage fluidized bed type fine iron ore reducing apparatus,...

C - Chemistry – Metallurgy – 21 – B

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

Patent

CA 2341365

A 2-Stage fluidized bed type reducing apparatus and a reducing method for fine iron ore of a wide particle size distribution with increasing the reducing gas utilization degree are disclosed. Fine iron particles dropping through the holes of a gas distributor (102, 202) can be recycled into the fluidized bed type furnace, thereby preventing an impediment of the reducing gas flow due to abnormal defluidizing or channeling. A first fluidized bed type furnace (100) dries, pre-heats and pre-reduces the fine iron ore, and a second fluidized bed type furnace (200) finally reduces the pre- reduced iron ore. Downstream of the respective fuidized beds, there are installed intermediate hoppers (500, 600) and gas/solid sealing valves (501, 503, 601, 603). Thus the fine iron ore particles which drop through the holes of gas distributors (102, 202) during the abnormal operation are recycled to the furnaces (100, 200) Accordingly the gas flow is not impeded.

L'invention concerne un appareil de réduction à lits fluidisés double étage et procédé de réduction de minerai de fer à distribution granulométrique différente consistant à augmenter le degré d'utilisation du gaz réducteur. On peut recycler les fines particules de fer acheminées à travers des orifices d'un distributeur de gaz (102, 202) dans un fourneau de type à lit fluidisé, évitant ainsi que l'écoulement de gaz réducteur ne soit entravé à cause d'une défluidisation ou d'un acheminement anormal(e). Un premier fourneau à lit fluidisé (100) sèche, préchauffe et préréduit le minerai de fer et un second fourneau à lit fluidisé (200) réduit finalement le minerai de fer préréduit. En aval des lits fluidisés sont installées des trémies intermédiaires (500, 600) et des clapets d'étanchéité (501, 503, 601, 603) de gaz/solide. Ainsi, les fines particules de minerai de fer qui sont évacuées par les orifices des distributeurs de gaz (102, 202) lors d'apparition d'anomalies sont recyclées vers les fourneaux (100, 200). De cette manière, l'écoulement de gaz n'est pas obstrué.

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