C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/322, 53/334
C22B 13/00 (2006.01) C21B 13/08 (2006.01) C22B 1/24 (2006.01) C22B 19/04 (2006.01)
Patent
CA 1106619
ABSTRACT OF THE DISCLOSURE A waelz process of volatilizing zinc and lead from iron oxide-containing feed material in an inclined rotary kiln, in which pelletized and at least partially dried feed material is charged into the rotary kiln at its upper end together with solid carbonaceous reducing agent, volatil- ization and reduction are effected at a temperature below the softening point of the charge, metallic iron-containing matter is discharged from the lower end of the rotary kiln, part of the discharged matter is separated and is recycled to the feed material before the latter is pelletized, the gaseous oxygen required for combustion is sucked into the lower end of the rotary kiln, and the exhaust gases which contain the volatil- ized constituents are sucked from the upper end of the rotary kiln. The process of the invention is characterized in that the material to be recycled which has been separated from the metallic iron-containing matter is ground to a particle size below about 1 mm and subsequently admixed to the feed material before the latter is pelletized and the pellets are at least partially dried with oxygen-containing gases at temperatures below 300°C. The invention permits a relatively low-cost production of pallets which can be used in the waelz process and exhibit only a small tendency to be disintegrated and abraded in the rotary kiln so that a major portion of the solid matter which is discharged from the kiln can be directly used in the blast furnace.
311358
Eichberger Heinz
Rausch Hans
Serbent Harry
Steinhofel Horst
Metallgesellschaft Aktiengesellschaft
Robic Robic & Associes/associates
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