Decoating of aluminium scrap

Details Decoating of aluminium scrap Decoating of aluminium scrap

B - Operations, Transporting

23

K

148/27

B23K 7/00 (2006.01) C22B 1/00 (2006.01) C22B 21/00 (2006.01)

Patent

CA 1177368

A B S T R A C T A method of removing organic coatings from scrap aluminium 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 hot gas being at a temperature to raise the upper surface of the bed of scrap to a temperature in the range of 500° - 600°C, 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 burnt 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.

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