Method of reprocessing residual metallurgical materials...

Details Method of reprocessing residual metallurgical materials... Method of reprocessing residual metallurgical materials...

C - Chemistry, Metallurgy

22

B

C22B 19/20 (2006.01) C22B 5/16 (2006.01) C22B 7/02 (2006.01) C22B 13/02 (2006.01) C22B 19/28 (2006.01)

Patent

CA 2123378

-22- ABSTRACT Residual metallurgical materials which contain zinc and lead are reprocessed by a ther- mal treatment in a circulating fluidized bed. The required heat is generated in that solid carbon is combusted in the fluidized bed reactor of the circu- lating fluidized bed. A solid carbon content of 5 to 30 % is maintained in the lower part of the fluidized bed. Oxygen-containing gases are supplied to the upper part of the fluidized bed reactor, and CO2 is formed only in such an amount that zinc metal will not be re- oxidized. Substantially all solids are removed from the discharged suspension in a recycle cyclone and are recycled. The gas is cooled to a temperature at which zinc metal is oxidized to ZnO. The dustlike compounds of zinc and lead are separated from the gas.

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