Treatment of automobile shredder residue by vacuum pyrolysis

C - Chemistry – Metallurgy – 10 – B

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C10B 53/00 (2006.01) C10B 57/02 (2006.01) C22B 1/00 (2006.01) C22B 7/00 (2006.01)

Patent

CA 2045254

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 425 to about 650°C, under a subatmospheric pressure in the range of about 50 to about 200 mmHg 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 non-oxidized and substantially carbon-free form suitable for direct recycling. Significant amounts of valuable metals such as iron, copper, aluminum and zinc may thus be recovered.

Métaux récupérés de résidus d'une déchiqueteuse d'automobiles. Les résidus sont soumis à la pyrolyse sous vide pour produire des gaz non condensables, des vapeurs d'hydrocarbures condensables, de la vapeur d'eau et un résidu solide contenant des métaux non-oxidés et un matériau carboné.. La pyrolyse sous vide est réalisée à des températures de l'ordre d'environ 425 à 650 degrés C sous une pression subatmosphérique variant d'environ 50 à 200 mm HG, afin que les matières collées aux métaux puissent être décomposées thermiquement et se vaporiser complètement. Au moins un métal est séparé des résidus solides. Le métal est récupéré sous forme de produit pratiquement sans carbone, non oxydé, se prêtant au recyclage direct. De grandes quantités de métaux utiles comme du fer, du cuivre, de l'aluminium et du zinc peuvent ainsi être récupérés.

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