Treatment of automobile shredder residue by vacuum pyrolysis
US5451297A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1993 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Sep 14, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Metals are recovered from automobile shredder residue by subjecting the shredder residue to vacuum pyrolysis to produce non-condensable gases, condensable hydrocarbon vapors and water vapor, and a solid residue containing non-oxidized metals and a carbonaceous material. The vacuum pyrolysis is carried out at a temperature in the range of about 450.degree. to about 650.degree. C., under a subatmospheric pressure in the range of about 50 to about 200 mm Hg so as to thermally decompose and substantially completely vaporize organic matter adhered to the metals. At least one metal is separated from the solid residue, the metal being recovered in nonoxidized and substantially carbon-free form suitable for direct recycling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.