A process for the recovery of adsorbed palladium from spent...

C - Chemistry – Metallurgy – 22 – B

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C22B 11/00 (2006.01) C01B 33/10 (2006.01) C01B 33/14 (2006.01) C22B 3/06 (2006.01) C22B 3/26 (2006.01) C22B 3/44 (2006.01) C22B 7/00 (2006.01) C22B 11/02 (2006.01)

Patent

CA 2508237

The present invention relates to a process for the recovery of precious metals from spent catalysts or adsorbent or inorganic waste. More specifically a process is provided for the recovery of palladium from silica, which is used as an absorbent in column chromatography or as a catalyst support in many catalysts. The process includes burning the spent silica to oxidize the organic component of the adsorbed Pd-complex, digesting the cooled residue with a mineral acid, filtering the obtained solution to separate out silica residue, adjusting the pH of the filtrate to remove precipitate impurities and raising the pH of the purified filtrate to recover a palladium salt.

La présente invention concerne un procédé permettant d'extraire des métaux précieux à partir de catalyseurs usagés ou de déchets adsorbants ou inorganiques. Plus particulièrement, l'invention concerne un procédé permettant d'extraire du palladium à partir de silice, laquelle est utilisée en tant qu'adsorbant lors d'une chromatographie en colonne ou en tant que support catalytique dans plusieurs catalyseurs. Le procédé décrit dans cette invention consiste à brûler la silice usagée afin d'oxyder le composant organique du complexe de palladium (Pd) adsorbé, à permettre la digestion du résidu refroidi au moyen d'un acide minéral, à ajuster le pH du produit filtré de manière à éliminer les impuretés du précipité et à augmenter le pH du produit filtré purifié afin de récupérer un sel de palladium.

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