Recovery of nickel from uranium containing ore

C - Chemistry – Metallurgy – 22 – B

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C22B 3/44 (2006.01)

Patent

CA 2059428

Nickel is found in substantial quantities in some uranium-containing ores. Recovery of uranium from such ores by the known acid leaching process includes a solvent extraction stage that leaves an aqueous raffinate containing nickel, together with other components including iron, arsenic, radium 226 and uranium. Attempts have been made to recover nickel from this raffinate but have not been successful because the costs of recovery are so high that the process is uneconomic or because the nickel obtained is contaminated with radium 226 and uranium to such a degree that the nickel is unacceptable. The present invention provides a process for obtaining from the raffinate a solution of a nickel salt that is not unacceptably contaminated with radium 226 and uranium. The process is economic and in a preferred embodiment uses only air, lime and a barium salt, preferably barium chloride, as reagents. If cobalt is also present in the ore it is recovered with the nickel.

On trouve d'importantes quantités de nickel dans certains minerais uranifères. La récupération d'uranium à partir de ces minerais par le procédé bien connu de lixiviation acide comprend une étape d'extraction au solvant, qui laisse un raffinat aqueux renfermant du nickel avec d'autres constituants, incluant le fer, l'arsenic, le radium 226 et l'uranium. On a procédé à des essais pour récupérer le nickel à partir de ce raffinat, mais ils n'ont pas été concluants à cause du coût prohibitif de ce procédé et parce que le nickel obtenu est contaminé par le radium 226 et l'uranium à un degré tel que sa qualité devient inacceptable. L'invention donne un procédé permettant d'obtenir, à partir d'un raffinat, une solution de sel de nickel dont la contamination par le radium 226 et l'uranium est acceptable. Le coût du procédé est satisfaisant et, dans une version privilégiée, n'utilise que de l'air, de la chaux et un sel de baryum, de préférence du chlorure de baryum, comme réactifs. S'il y a présence de cobalt dans le minerai, il est récupéré avec le nickel.

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