C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
53/32, 39/62
C21B 13/02 (2006.01) C21B 7/00 (2006.01) F27B 1/26 (2006.01)
Patent
CA 1287216
ABSTRACT OF THE DISCLOSURE A method of producing a hot, carburized metallized iron product in a generally vertical shaft furnace having an upper reducing zone in which iron oxide reacts with a gaseous reduc- tant, and a lower carbon control and product discharge zone, including: establishing a gravitationally descending iron oxide burden in the furnace; reacting hot gaseous reductant with the descending burden to form a metallized iron product and a reacted top gas; and injecting a hydrocarbon gas mixture con- sisting of hot reformed reducing gas and cool natural gas to the product discharge section of the shaft furnace; whereby the car- bon content of the metallized iron pellet product is controlled by mixing the reformed gas and natural gas in the proper ratio to balance the endothermic and exothermic reactions within the discharge zone of the furnace. Apparatus for carrying out the method includes means for controlling the respective amounts of gas introduced to the product discharge zone from the reformer and the source of natural gas.
532405
Freeland Michael Neal
Hughes Gregory Darel
Gowling Lafleur Henderson Llp
Midrex International B.v. Rotterdam Zurich Branch
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