Method of reprocessing metallurgical residues, which contain zin

Details Method of reprocessing metallurgical residues, which contain zin Method of reprocessing metallurgical residues, which contain zin

1994-05-27

1995-12-12

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75694, 75961, 75962, 423 97, 423108, 423623, 423DIG16, C22B 700

Patent

active

054745926

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.

REFERENCES:
patent: 5162107 (1992-11-01), Hirsch et al.
Steel Times Incorporating Iron & Steel, 220 (1992) Mar., No. 3, Redhill, Surrey, GB; pp. S19-S21; Kaune et al; "Fludised bed treatment of steelplant dust".
Metallurgical Plant and Technology Int 14 1991, 3, pp. 28-32.

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