Decoating of aluminum scrap
US4654088A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1982 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Aug 27, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.