Process for removal of the catalytic coating material from...

C - Chemistry – Metallurgy – 22 – B

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C22B 11/00 (2006.01) B08B 9/00 (2006.01) C22B 23/00 (2006.01) C23G 1/00 (2006.01) C23G 5/00 (2006.01) C25C 1/00 (2006.01)

Patent

CA 2563075

Process for recovering catalytic coating material from catalytic converters, catalytic material or catalytic assemblies where the catalytic coating material is bonded to a metal supporting structure, the process being carried out by contacting the catalytic coating material with nitric acid and/or a nitrate-containing chemical or material, applying heat, agitating the catalytic converters, catalytic material or catalytic assemblies being processed to dislodge the catalytic coating material, and rinsing the catalytic converters, catalytic material or catalytic assemblies with water to facilitate the removal of remaining catalytic coating material, and recovering ionic metal species dissolved by the nitric acid and/or nitrate-containing chemical or material.

La présente invention concerne un procédé pour récupérer une substance de revêtement catalytique de convertisseurs catalytiques, une substance catalytique ou un ensemble de substances catalytiques, la substance de revêtement catalytique étant liée à une structure de support métallique. Le procédé comprend les étapes suivantes: mise en contact de la substance de revêtement catalytique avec de l'acide nitrique et/ou un produit chimique ou une substance contenant des nitrates; application de chaleur; agitation des convertisseurs catalytiques, la substance catalytique ou l'ensemble de substances catalytiques étant traité(e) pour détacher la substance de revêtement catalytique; rinçage des convertisseurs catalytiques, de la substance catalytique ou de l'ensemble de substances catalytiques avec de l'eau, pour faciliter l'extraction de la substance de revêtement catalytique restante; et récupération des espèces métalliques ioniques dissoutes par l'acide nitrique et/ou le produit chimique ou la substance contenant des nitrates.

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