Heap bioleaching process for the extraction of zinc

C - Chemistry – Metallurgy – 22 – B

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C22B 3/18 (2006.01) C22B 3/06 (2006.01) C22B 19/00 (2006.01)

Patent

CA 2353002

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.

On fournit une méthode d'extraction de zinc à partir d'un minerai sulfuré, qui comprend la biolixiviation du minerai en tas avec des micro-organismes acidophiles pour produire une liqueur métallifère qui est récupérée dans le bas du tas. On fournit également un processus intégré permettant de soumettre la liqueur métallifère à une neutralisation et une extraction de solvant pour produire une solution de zinc concentrée. Le zinc peut être récupéré de la solution concentrée par extraction électrolytique, soit en l'absence ou la présence de manganèse. Alternativement, le zinc peut être récupéré sous la forme d'un composé de zinc.

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