Direct-reduction process carried out in a rotary kiln

Details Direct-reduction process carried out in a rotary kiln Direct-reduction process carried out in a rotary kiln

1978-04-20

1979-12-18

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 34, C21B 1308

Patent

active

041792807

ABSTRACT:
A process for directly reducing iron oxide-containing materials to provide sponge iron by heating said iron oxide-containing materials in a rotary kiln while employing a solid carbonaceous reducing agent having a high content of volatile combustible components, wherein oxygen-containing gases are injected into the rotary kiln at a controlled rate through shell pipes into the free kiln space and the charge is moved through the rotary kiln countercurrently to the flow of the kiln atmosphere, is described. The invention lies in injecting oxygen-containing gases at controlled rates through nozzle blocks into the charge disposed over said nozzle blocks and in injecting oxygen-containing gases at controlled rates through shell pipes into the free kiln space in that region of the heating-up zone defined by a point along the length of the heating-up zone where ignitable particles of the solid reducing agent first appear and a second point before the reducing zone.

REFERENCES:
patent: 3170786 (1965-02-01), Moklebust
patent: 3180631 (1965-04-01), Moklebust
patent: 3206299 (1965-09-01), Senior
patent: 3231366 (1966-01-01), Schenck
patent: 3331679 (1967-07-01), Schenck
patent: 3881916 (1975-05-01), Serbent

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