Decoating of aluminum scrap

Details Decoating of aluminum scrap Decoating of aluminum scrap

1982-08-27

1987-03-31

Bashore, S. Leon

Cleaning and liquid contact with solids

Processes

Combined

134 19, 134 251, 134 38, 75445, 75 68R, B08B 500, B08B 704

Patent

active

046540881

ABSTRACT:
A method of removing organic coatings from scrap aluminum which includes passing a bed of the scrap metal supported on a gas-permeable conveyor through a pyrolysis zone and passing an oxygen-containing hot gas downwardly through the scrap metal bed, the conveyor advancing continuously through the pyrolysis zone, the hot gas being at a temperature to raise the upper surface of the bed of scrap to a temperature in the range of 500.degree.-600.degree. C.; and the temperature and rate of supply and oxygen content of such gas and the rate of travel of the bed of scrap being adjusted to ensure that a reaction front at which the organic material is pyrolysed and residual carbon is burned travels from top to bottom of the bed within the pyrolysis zone and to allow the scrap to be retained within the pyrolysis zone for up to 10 minutes after the reaction front reaches the bottom of the bed.

REFERENCES:
patent: 3346417 (1967-10-01), Ehrlich
patent: 3668077 (1972-06-01), Ban
patent: 3762858 (1973-10-01), Torrence
patent: 3985497 (1976-10-01), Fellnor et al.
patent: 4032361 (1977-06-01), Eriksson et al.
patent: 4135702 (1979-01-01), Venetta et al.
patent: 4147531 (1979-04-01), Miller
patent: 4235646 (1980-11-01), Neufeld et al.
patent: 4264060 (1981-04-01), Twyman
patent: 4411695 (1983-10-01), Twyman

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