C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
C21B 13/14 (2006.01) C21B 13/00 (2006.01) C22B 5/14 (2006.01)
Patent
CA 2184009
A reduction apparatus and a method for efficient reduction of fine iron ores of wide grain range comprising serially arranged a drying/preheating furnace, a first reducing furnace for prereduction and a second reduction furnace for final reduction, each working with bubbling fluidized bed and being connected each to a cyclon for capturing iron ore dust contained in the exhaust gases, having each a tapered shape smoothly expanded outwards and thus considerably decreasing elutriation of fine particles, increasing the reduction efficiency and enhancing the utilization of the reducing gas.
L'invention se rapporte à un appareil et à un procédé de réduction conçus pour réaliser une réduction efficace des minerais de fer fins à large granulométrie. Cet appareil comprend, disposés en série, un four de séchage/préchauffage, un premier four de réduction destiné à la préréduction et un second four de réduction destiné à la réduction finale, chacun mettant en oeuvre un lit fluidisé et étant raccordé à un cyclone destiné à capturer la poussière de minerai de fer contenue dans les gaz d'échappement, chacun de ces cyclones ayant une forme conique, légèrement dilatée vers l'extérieur, ce qui réduit considérablement l'élutriation des particules fines, augmente l'efficacité de réduction et améliore l'utilisation des gaz de réduction.
Hauzenberger Franz
Jung Bong Jin
Kim Hang Goo
Kim Yong Ha
Lee Il Ock
Pohang Iron & Steel Co. Ltd.
Research Institute Of Industrial Science & Technology
Robic
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