Improved base metal recovery process from heap leaching

Details Improved base metal recovery process from heap leaching Improved base metal recovery process from heap leaching

C - Chemistry, Metallurgy

22

B

C22B 3/08 (2006.01) C22B 3/44 (2006.01)

Patent

CA 2640122

A process for the recovery of base metals from an oxide ore, comprising the steps of: e) forming at least one heap (40) of the oxide ore containing the base metals to be recovered; f) irrigating the at least one heap (40) of oxide ore with a leach solution (42) comprising sulphuric acid; g) collecting resulting pregnant leach solution (44,50) from the irrigated heap (40); and treating the pregnant leach solution (44,50) with a reducing gas stream to create a treated pregnant leach solution for recovery of required base metals. The process is applicable to treatment of laterite ores and the conversion of ferric ions to ferrous ions, with regeneration of sulphuric acid in the process, has benefits in terms of enhanced process efficiency and reduced operating costs.

L'invention concerne un procédé de récupération de métaux de base à partir d'un minerai d'oxyde, comprenant les étapes suivantes : e) former au moins un tas (40) du minerai d'oxyde contenant les métaux de base à récupérer ; f) irriguer le ou les tas (40) du minerai d'oxyde avec une solution de lixiviation (42) comprenant de l'acide sulfurique ; g) recueillir la solution de lixiviation mère résultante (44, 50) à partir du tas irrigué (40) ; et traiter la solution de lixiviation mère (44, 50) avec un courant de gaz réducteur afin de créer une solution de lixiviation mère traitée pour la récupération des métaux de base requis. Le procédé est applicable au traitement des minerais de latérite et à la conversion d'ions ferriques en ions ferreux, avec régénération de l'acide sulfurique dans le procédé, et présente des avantages en termes d'efficacité améliorée et de coûts de fonctionnement réduits.

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