Process and apparatus for producing sponge iron or pig iron

Details Process and apparatus for producing sponge iron or pig iron Process and apparatus for producing sponge iron or pig iron

C - Chemistry, Metallurgy

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B

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C21B 5/00 (2006.01) C21B 11/00 (2006.01) C21B 13/00 (2006.01) C21B 13/02 (2006.01) C21B 13/14 (2006.01)

Patent

CA 1278430

ABSTRACT Process and apparatus for producing sponge iron or pig iron A process for producing sponge iron from iron ore is described, which is reduced to sponge iron in a reduction shaft furnace by means of a hot reduction gas. For this purpose reduction gas at a temperature in the range 750 to 900°C is introduced into shaft furnace level with bustle plane having been produced in a gasifier then cooled and purified in a cyclone separator . Reduction gas is introduced below the bustle plane at a temperature below that of the reduction gas introduced in the bustle plane and is preferably introduced into the shaft furnace between 650 and 750°C. Increased carburization of the sponge iron is obtained. Increased carbon separation also results through a volume increase, particularly by increasing the cross-section through the lower part of the shaft furnace. Carburiza- tion is also assisted in that the ratio of the reduction gas quantity supplied below the bustle plane is made as large as possible compared with the reduction gas quantity supplied in the bustle plane.

492509

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