Carbonyl process for recovery of purified cobalt

C - Chemistry – Metallurgy – 22 – B

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C22B 23/06 (2006.01) C01G 51/02 (2006.01) C22B 5/20 (2006.01)

Patent

CA 2391939

A process for producing purified cobalt from a mixture comprising metallic species of cobalt and metallic species of at least one of the group consisting of nickel and iron, comprising producing a metal carbonyl mixture of cobalt carbonyl and at least one of nickel carbonyl and iron carbonyl from the metallic species mixture; separating the nickel carbonyl and/or iron carbonyl from the cobalt carbonyl; treating the cobalt carbonyl with an effective amount of a complexing gaseous mixture of nitric oxide/carbon monoxide to produce cobalt nitrosyl tricarbonyl; and decomposing the purified cobalt nitrosyl carbonyl to provide purified cobalt and regenerated complexing gaseous mixture for recycle. The process provides cobalt of improved quality in an optionally, continuous and closed-loop manner. Preferred processes include either aqueous and/or gaseous process steps.

L'invention concerne un procédé pour produire du cobalt purifié à partir d'un mélange comprenant des espèces chimiques métalliques de cobalt et des espèces chimiques métalliques d'au moins un groupe constitué de nickel et de fer. Ledit procédé consiste à : réaliser un mélange de métal carbonyle comprenant du cobalt-carbonyle et au moins du nickel carbonyle ou du fer-pentacarbonyle à partir du mélange des espèces chimiques métalliques; séparer le nickel carbonyle et/ou le fer-pentacarbonyle du cobalt-carbonyle; traiter le cobalt-carbonyle avec une quantité suffisante d'un mélange gazeux complexant de monoxyde d'azote/monoxyde de carbone pour obtenir du cobalt nitrosyltricarbonyle; décomposer le cobalt nitrosyltricarbonyle purifié pour obtenir du cobalt purifié et un mélange gazeux complexant régénéré pour le recyclage. Ledit procédé permet d'obtenir du cobalt de qualité améliorée, éventuellement en circuit fermé et en continu. Des modes de réalisation préférés comprennent des étapes de procédé en phase aqueuse et/ou gazeuse.

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