Method of reprocessing metallurgical residues, which contain zinc and lead

US5474592A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Wolfgang Bresser · Großostheim, DE
• Martin Hirsch · Friedrichsdorf, DE
• Albert Kaune · Königstein, DE
• Uwe Harter · Dinslaken, DE

Key dates

• Filing date: May 27, 1994
• Grant date: Dec 12, 1995
• Expiry date: May 27, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/16
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Residual metallurgical materials which contain zinc and lead are reprocessed by a thermal treatment in a circulating fluidized bed. The required heat is generated in that solid carbon is combusted in the fluidized bed reactor of the circulating 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 CO.sub.2 is formed only in such an amount that zinc metal will not be reoxidized. 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.