Process for extracting iron from an aqueous acid solution

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/00 (2006.01)

Patent

CA 2740343

The invention relates to an iron extraction process from an aqueous acid solution containing ferrous ions. The acidic feed solution is first passed to a fluidized bed reactor for the oxidation of the ferrous ions preferably by microbes (Lep-tospirillum ferriphilum) to give ferric ions, followed by introducing the solution obtained to a concentrator for the precipitation of a compound containing ferric ions from the solution to give solid matter. The final product, i.e. solid matter containing ferric ions, is collected. In the process, the solution to be treated is passed through the fluidized bed at a flow rate sufficient for effective flu-idization and mixing in the fluidized bed. Further, an apparatus for performing the iron extraction process is claimed. The carrier for the microbes may be activated carbon.

L'invention porte sur un procédé pour extraire du fer d'une solution aqueuse acide contenant des ions ferreux. La solution de départ acide est d'abord acheminée à un réacteur à lit fluidisé pour l'oxydation des ions ferreux de préférence par des microbes (Leptospirillum ferriphilum) pour donner des ions ferriques, la solution obtenue étant ensuite introduite dans un concentrateur pour la précipitation d'un composé contenant des ions ferriques à partir de la solution pour donner une matière solide. Le produit final, c'est-à-dire la matière solide contenant des ions ferriques, est recueilli. Selon ce procédé, on fait passer la solution à traiter à travers le lit fluidisé à un débit suffisant pour obtenir une fluidisation et un mélange efficaces dans le lit fluidisé. En outre, l'invention porte sur un appareil pour la mise en uvre du procédé d'extraction de fer. Le support pour les microbes peut être du charbon actif.

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