Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1990-12-20
1992-11-10
Morris, Theodore
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
423622, 423104, 423107, 423108, 423 97, 423619, 423DIG16, C01G 902
Patent
active
051621070
ABSTRACT:
A zinc- and lead-containing residue from a metallurgical plant is reprocessed by a thermal treatment in a circulating fluidized bed system. A major part of the heat demand is satisfied by a combustion of solid carbonaceous material 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 of from 5 to 30% is adjusted in the fluidized bed in the lower portion of the fluidized bed reactor, which is supplied in its upper portion with oxygen-containing gases and in which CO.sub.2 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 discharged from the reactor and the removed solids are recycled. The gas is cooled to a temperature at which zinc metal is oxidized to ZnO. The dust-like zinc compounds and lead compounds are removed from the gas.
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Broj Karlheinz
Harter Uwe
Hirsch Martin
Kaune Albert
Meichsner Walter
Metallgesellschaft Aktiengesellschaft
Morris Theodore
Sguillante Edward
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