Process for the concentration of noble metals from...

H - Electricity – 01 – M

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H01M 8/02 (2006.01) C22B 11/02 (2006.01) H01M 6/52 (2006.01) H01M 10/52 (2006.01)

Patent

CA 2525933

The present invention relates to a process for the concentration of noble metals from fluorine-containing components of fuel cells, for example from PEM fuel cell stacks, DMFC fuel cells, catalyst-coated membranes (CCMs), membrane electrode assemblies (MEAs), catalyst pastes, etc. The process is based on an optionally multi-step heat treatment process comprising a combustion and/or a melting process. It allows an inexpensive, simple concentration of noble materials. The hydrogen fluoride formed during the heat treatment of fluorine- containing components is bound by an inorganic additive so that no harmful hydrogen fluoride emissions occur. The process can be used for the recovery of noble metals that are present as components in fuel cells, electrolysis cells, batteries, and the like.

La présente invention a trait à un procédé pour la concentration de métaux nobles à partir de composants de piles à combustible contenant du fluor, par exemple des blocs de piles à combustibles à électrolytes polymériques, des piles à méthanol direct, des membranes à revêtement catalytique, des ensembles d'électrodes à membrane, des catalyseurs en pâte et analogues. Le procédé est basé sur un traitement thermique à plusieurs étapes comprenant un traitement de combustion et/ou de fusion. Il permet une concentration économique et simple de matériaux nobles. Le fluorure d'hydrogène formé lors du traitement thermique des composants fluorés est lié par un additif inorganique de sorte qu'il ne se produit pas d'émissions nuisibles de fluorure d'hydrogène. Le procédé peut être utilisé pour la récupération de métaux nobles présents en tant que composants dans des piles à combustible, des piles électrolytiques, des batteries, et analogues.

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