Heap bioleaching process for the extraction of zinc

Details Heap bioleaching process for the extraction of zinc Heap bioleaching process for the extraction of zinc

C - Chemistry, Metallurgy

22

B

C22B 19/00 (2006.01) C22B 3/18 (2006.01)

Patent

CA 2453364

A method of extracting zinc from a sulphidic ore is provided which comprises bioleaching the ore in a heap with acidophilic microorganisms to produce a pregnant leach solution which is recovered from the bottom of the heap. An integrated process which comprises subjecting the pregnant leach solution to neutralization and solvent extraction to produce a concentrated zinc solution is also provided. Zinc may be recovered from the concentrated solution by means of electrowinning, either in the absence or presence of manganese. Alternatively zinc may be recovered in the form of a zinc compound.

L'invention concerne un procédé qui sert à extraire du zinc d'un minerai sulfuré et qui consiste à lixivier biologiquement le minerai dans un tas avec des microorganismes acidophiles afin de produire une solution de lixiviation sursaturée qui est récupérée au fond du tas. L'invention concerne également un processus intégré qui consiste à soumettre la solution de lixiviation sursaturée à une neutralisation et à une extraction par solvant afin de produire une solution concentrée de zinc. Le zinc peut être récupéré de la solution concentrée par électro-extraction, en l'absence ou en présence de manganèse. Dans une variante, le zinc peut être récupéré sous la forme d'un composé de zinc.

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