Process for recovery of nickel and cobalt from laterite ores...

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 3/42 (2006.01) C22B 1/00 (2006.01) C22B 3/04 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2669147

The process, according to the invention, comprises the following stages: (a) processing (1) of the laterite ore (O) by crushing, scrubbing, attrition, separation, and high-intensity magnetic separation; (b) Leaching (2) of the non-magnetic fraction (CN) obtained form the previous stage (a); (c) optionally, neutralization (3) of the effluent from the leaching and/or solid-liquid separation stages (4); (d) treatment of the effluents from stages (b) or (c) using an ion-exchange hybrid system (5) comprising at least one circuit for removal of impurities and at least one circuit for recovery of nickel and cobalt; (e) elution (6) of the ion-exchange resin used; (f) separation, purification, and recovery (7) of the nickel and cobalt.

Procédé comprenant les étapes suivantes : (a) traitement (1) du minerai de latérite (0) grâce à un broyage, un frottement, une abrasion, une séparation et une séparation magnétique de haute intensité; (b) lessivage (2) de la fraction non magnétique (CN) obtenue à l'étape précédente (a); (c) en option, neutralisation (3) de l'eau résiduaire du lessivage et/ou des étapes précédentes de séparation des solides-liquides (4); (d) traitement des eaux résiduaires des étapes (b) ou (c) en utilisant un système hybride à échange d'ions (5) comprenant au moins un circuit pour enlever les impuretés et au moins un circuit pour récupérer le nickel et le cobalt; (e) élution de la résine échangeuse d'ions utilisée; (f) séparation, purification, et récupération (7) du nickel et du cobalt.

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