APPARATUS FOR RECOVERING REDUCED IRON POWDER IN IRON ORE PRE-REDUCING APPARATUS

摘要

PURPOSE:To improve the recovery ratio of reduced iron powder and the yield of reducing ore by recovering reduced iron powder contained in exhaust gas from a fluidized bed pre-reducing furnace with a cyclone and a filtration device using ceramic filter at the rear step of the cyclone. CONSTITUTION:In smelting reduction apparatus, the cyclone 10 is set at outlet side of the exhaust gas of the fluidized bed prereducing furnace 6 to catch relatively large particle in the reduced iron powder contained in the exhaust gas. Successively, small particle in the reduced iron powder is caught and recovered with the filtration device 11 using ceramic filter and arranging at the rear step of the cyclone 10. A heat exchanger 12 is set between the filtration device 11 and a dispersing tower 13, and sensible heat in the exhaust gas from the filtration device 11 is recovered. The filtration device 11 has main constructions composing of a can body 31, ceramic porous body 32 fitted in the can body 31, introducing pipe 33 for introducing the exhaust gas from the cyclone 10 and an exhaust pipe 34 for exhausting the exhaust gas after filtrating.