Processing of laterite ore

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 3/06 (2006.01) C22B 3/04 (2006.01) C22B 5/00 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2640550

A process for the leaching of metals from highly oxidised laterite ores. The ore is admixed with an acidic aqueous medium, preferably a solution of sulfuric acid and the resulting mixture is treated with a sulfur reducing agent so as to reduce mineral species containing cobalt, nickel or manganese. The sulfur reducing agent may be an aqueous solution of sulfur dioxide or more preferably the sulfur dioxide is generated in situ by the reduction of alkali metal sulfite salt. The process is conducted at ambient temperature and pressure with the reduced mineral species being dissolved and subsequently recovered.

L'invention concerne un procédé de lixiviation de métaux à partir de minerais de latérite hautement oxydés. Le minerai est mélangé avec un milieu aqueux acide, de préférence une solution d'acide sulfurique et le mélange résultant est traité avec un agent de réduction soufré de manière à réduire les espèces minérales contenant du cobalt, du nickel ou du manganèse. L'agent de réduction soufré peut être une solution aqueuse de dioxyde de soufre ou, plus préférablement le dioxyde de soufre est généré in situ par la réduction du sel de sulfite de métaux alcalins. Le procédé est réalisé à température et pression ambiantes, l'espèce minérale étant dissoute, puis récupérée.

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