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

C - Chemistry, Metallurgy

21

B

53/30

C21B 13/08 (2006.01) C21B 11/06 (2006.01)

Patent

CA 1108864

ABSTRACT OF THE DISCLOSURE: Process of directly reducing iron oxyde-containing materials to produce sponge iron in a rotary kiln by means of solid carbonaceous reducing agents having a high content of volatile combustible constituents, said kiln having a heating-up zone in which the solid charge is heated to approximately the reduction temperature, wherein oxygen-containing gases are injected 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. The process of the invention is characterized in that oxygen-containing gases are injected at controlled rates through said nozzle blocks into the charge disposed over nozzle blocks in that region of the heating-up zone which begins at the point where ignitable particles of the solid reducing agent first appear and terminates before the reducing zone and oxygen-containing gases are injected at a controlled rate through shell pipes into the free kiln space of the heating-up zone. The advantages afforded by the invention reside in that the length of the heating-up zone of the rotary kiln is greatly reduced and, as a result, either the throughput rate of given kiln is increased or a smaller kiln may be used for a given throughput rate. In addition, the difference between the gas temperature and the bed temperature is minimized and the exhaust gas temperature is minimum too. The lower heat content per unit of volume reduces the danger of a formation of crusts and increases the durability of the refractory lining.

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