Method for reprocessing materials containing precious metals...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 11/00 (2006.01) B01D 15/08 (2006.01) B01J 39/26 (2006.01) C22B 3/42 (2006.01) C22B 11/06 (2006.01)

Patent

CA 2303046

The invention relates to a method for reprocessing materials containing precious metals especially from metallurgic primary concentrates in which the materials are subjected to an increased temperature in the sequence of an oxidized treatment, a reducing treatment and a chlorination by the application of gaseous treatment media. Gold and the platinum group metals remain as residual matter with the characteristic that the residual matter is subjected to oxidized acid leaching. The gold portion is chromatographically separated first from the liquid phase and the remaining liquid is then chromatographically fractionated into the individual platinum group metals, whereby the fractionation is carried out by means of relative movement between a particle bed in the form of a cylinder jacket and at least one output position for the liquid.

L'invention concerne un procédé permettant de retraiter des matériaux contenant des métaux précieux, notamment des concentrés primaires de métallurgie. Ce procédé consiste à soumettre ces matériaux, à température élevée et chronologiquement, à un traitement oxydant, à un traitement réducteur et à une chloration réalisée à l'aide d'agents gazeux. L'or et les métaux du groupe platine restent sous forme de résidu. Ce résidu est soumis à une lixiviation acide oxydante. La fraction d'or est d'abord séparée de la phase liquide par voie chromatographique, ensuite le liquide restant est fractionné par voie chromatographique pour obtenir les différents métaux du groupe platine. Le fractionnement est réalisé par mouvement relatif d'un lit de particules se présentant sous forme d'enveloppe d'un cylindre par rapport à au moins un point d'alimentation en liquide.

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