Blast furnace operating method

C - Chemistry – Metallurgy – 21 – B

Patent

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C21B 5/00 (2006.01) C21B 7/00 (2006.01)

Patent

CA 2180544

A method of operating a blast furnace enables substantial improvement of gas permeability and liquid permeability for stable operation of the blast furnace, involves packing the core section with solid high strength, carbonaceous blocks prior to ignition of the furnace. The carbon blocks resist wearing and high temperature reaction over very long periods of operating time, greatly stabilizing the furnace. Because of the improved stabilization, gas permeability and liquid permeability, a low grade solid reducing agent can be substituted for a quantity of the high quality coke normally used for operating the blast furnace and furthermore enables injection of pulverized coal at a rate of at least 200 Kg/ton-pig.

Procédé d'utilisation d'un haut fourneau dans des conditions stables consistant à améliorer la perméabilité du fourneau à l'air et aux liquides, et procédé d'utilisation d'un haut fourneau permettant l'emploi d'un agent réducteur solide de qualité médiocre, afin de réduire la quantité de coke de grande qualité utilisé dans le fourneau, et permettant également l'injection de charbon pulvérulent en une quantité au moins égale à 200 kg/tonne de fonte. Afin d'atteindre ces objectifs, le procédé d'utilisation d'un haut fourneau destiné à produire de la fonte brute par le chargement du coke et du minerai par le haut consiste à former une zone que l'on remplit de morceaux de résistance élevée dans l'homme-mort.

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