C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
53/30
C21B 11/06 (2006.01) C21B 13/00 (2006.01) C21B 13/08 (2006.01)
Patent
CA 1069313
ABSTRACT OF THE DISCLOSURE A process for the direct reduction of iron oxide- containing materials to produce sponge iron by a treatment with solid carbonaceous reducing agents in a rotary kiln at a temperature below the softening and melting point of the charge, in which the kiln atmosphere flows opposite to the direction of movement of the charge, at least part of the solid carbonaceous reducing agents is charged in agglomerated form into the rotary kiln at the charging end thereof, and oxygen- containing gases are fed into the rotary kiln. The process is characterized in that highly reactive, solid carbonaceous reducing agents which contain 20-50% volatile constituents are charged in agglomerated form into the rotary kiln at the charging end thereof and are heated up at such a rate that they disintegrate into fine particles substantially in and before the end of the heating-up zone of the rotary kiln. The process of the invention enables the use of highly reactive solid carbonaceous reducing agents in an economical and technically simple manner and an optimum utilization of the volatile constituents in the rotary kiln; the losses due to dust entrained by the exhaust gases are small, and optimum operating conditions in conjunction with a high throughput can be obtained.
243570
Reuter Gerhard
Schnabel Wolfram
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