Direct reduction process in a rotary kiln

Details Direct reduction process in a rotary kiln Direct reduction process in a rotary kiln

C - Chemistry, Metallurgy

21

B

53/30

C21B 13/08 (2006.01)

Patent

CA 1113252

ABSTRACT OF THE DISCLOSURE: The invention is concerned with a process of directly reducing iron oxide-containing material to produce sponge iron in a rotary kiln by a treatment with solid carbonaceous reducing agents having a high content of volatile combustible constituents, in which the charge is moved through the rotary kiln opposite to the direction of flow of the kiln atmosphere, oxygen-containing gases are blown at controlled rates through nozzle blocks into the charge disposed over nozzle blocks in the heating up zone in that region thereof which begins with the occurrence of ignitable particles of the solid reducing agents and terminates before the reducing zone, and oxygen- containing gases are blown at a controlled rate through shell tubes into the free kiln space at least in that region. The process of the invention is characterized in that the solid carbonaceous reducing agent consists at least in part of disintegrated waste rubber. The advantages afforded by the invention reside in that a direct reduction can be effected in an economical and simple manner with waste rubber as inex- pensive reducing agent and fuel whereas an additional process step is not required. Besides, the problems and casts related to a dump for waste rubber or to another processing of waste rubber can be avoided without need for an additional expendi- ture. The zinc contained in automobile tires can be recovered for utilization, and the iron content is included in the sponge iron so that the processing of the waste rubber does not result in waste products.

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