Process of directly reducing iron oxide-containing materials

Details Process of directly reducing iron oxide-containing materials Process of directly reducing iron oxide-containing materials

C - Chemistry, Metallurgy

21

B

53/30

C21B 13/08 (2006.01)

Patent

CA 1119001

ABSTRACT OF THE DISCLOSURE: In the process of directly reducing iron oxide- containing materials in a rotary kiln by means of solid carbo- naceous reducing agents having a high content of volatile cons- tituents, there is a risk of a reoxidation of the sponge iron in the final portion of the reducing zone unless there is still a surplus of solid reducing agent in that portion. In order to reduce the surplus which is required to reliably prevent a re- oxidation, reducing gases and/or liquid hydrocarbons are in- troduced through tubular air nozzles at least in part into the charge disposed over tubular air nozzles in the final portion of the reducing zone, beginning at a point where at least 75% of the iron have been metallized.

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