Two-stage twin-bed fluidized type pre-reduction apparatus for pre-reducing fine iron ore, and method for the same

摘要

ALL FOR THE SAME "D. A twin-bed fluidized-type reduction apparatus is disclosed - only method for it. The fluidization of fine iron ore is stabilized in order to optimize the degree of reduction and the rate of use of gas, and in order to minimize the loss by iron ore elutriation.The device includes a first pre-reduction furnace over only particles of coarse iron ore / intermediate between fine iron ores of a wide particle size distribution per a bubbly / turbulent fluidization after its loading from an iron ore feeder fly out A second pre-reduction on the fine iron ore particles floated from said first fluidized bed furnace (110) by a fluidization of bubbling, and a third fluidized bed oven (130) performs a second pre-reduction on the iron ores discharged from said first (110) and second undo (120) fluidized bed ovens after their first pre-reduction. A first cyclone (124) captures extremely fine iron ore particles from an exhaust gas discharged from the return lasers to the second bed furnace. Extremely fine iron ore flarticles from an exhaust gas discharged from said third furnace to the third fluidized bed oven (130). A gas recovery system (140) recovers part of the exhaust gases from the first cyclone (124) to circulate the recovered gas to the first (110) and second (120) fluidized bed furnaces.