Rheological method for the hydrometallurgical recovery of...

C - Chemistry – Metallurgy – 22 – B

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C22B 3/04 (2006.01) C01G 53/00 (2006.01) C22B 1/00 (2006.01)

Patent

CA 2727557

A rheological method for the hydrometallurgical recovery of base metals such as nickel from ores comprises the steps of combining a sulphide ore or concentrate (10) with a laterite or other oxide ore (12) and milling them together in a milling circuit (14) to form a combined slurry with improved rheological characteristics. The milled combined ore from the milling circuit (14) is subjected to a screening step in the screening circuit (18). Undersize ore is fed from the screening circuit (18) to a slurry tank (19), and the combined slurry is then pumped to a pressure acid leach circuit.

Linvention concerne un procédé rhéologique pour la récupération hydrométallurgique de métaux de base tels que le nickel à partir de minerais. Le procédé selon linvention comprend les étapes de combinaison dun minerai sulfuré ou dun concentré (10) avec une latérite ou un autre minerai oxydé (12) et de broyage de ces éléments ensemble dans un circuit de broyage (14) pour former une pâte combinée présentant des caractéristiques rhéologiques améliorées. Le minerai broyé combiné issu du circuit de broyage (14) est soumis à une étape de criblage dans le circuit de criblage (18). Le minerai trop petit est introduit à partir du circuit de criblage (18) dans une cuve de pâte (19), et la pâte combinée est ensuite pompée dans un circuit de lixiviation acide sous pression.

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