C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/28, 53/321, 5
C22B 19/30 (2006.01) C22B 5/16 (2006.01) C22B 7/00 (2006.01) C22B 7/02 (2006.01) C22B 13/02 (2006.01) C22B 19/04 (2006.01) C22B 19/34 (2006.01)
Patent
CA 2032759
Zinc- and lead-containing residues from metallurgical plants are reprocessed by a thermal treatment in a circulating fluidized bed system. A major part of the heat demand is satisfied by a com- bustion of solid carbon in the fluidized bed reactor of the circulating fluidized bed system. A reducing fluidizing gas, which is virtually free of free oxygen, is fed to the lower part of the fluidized bed reactor, A solid carbon content from 5 to 30 % is adjusted in the fluidized bed in the lower portion of the fluid- ized bed reactor, which is supplied in its upper por- tion with oxygen-containing gases and in which CO2 is formed only at such a rate that zinc metal is not reoxidized. Substantially all solids are removed in a recycling cyclone from the suspension which bas been discharged and are recycled. The gas is cooled to a temperature at which zinc metal is oxidized to ZnO. The dustlike zinc compounds and lead compounds are removed from the gas,
Broj Karlheinz
Harter Uwe
Hirsch Martin
Kaune Albert
Meichsner Walter
Metallgesellschaft Aktiengesellschaft
Robic
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