Method for producing metal hydroxides or alkaline metal...

C - Chemistry – Metallurgy – 25 – B

Patent

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C25B 1/00 (2006.01)

Patent

CA 2412927

The invention relates to a method for producing metal hydroxides or alkaline metal carbonates by anode dissolution of the corresponding metals and precipitation of the hydroxides or alkaline carbonates in an aqueous medium. The anode dissolution of the metal components is carried out in the anode compartment of a three-compartment electrolytic cell. An aqueous auxiliary salt solution is fed to an intermediate compartment that is disposed between the anode compartment and the cathode compartment and that is separated therefrom by a porous membrane. An at least not alkaline metal salt solution is continuously taken from the anode compartment while an alkaline auxiliary salt solution is continuously taken from the cathode compartment. The at least not alkaline metal salt solution and the alkaline auxiliary salt solution are combined outside the electrolytic cell for the purpose of precipitating metal hydroxides or alkaline metal carbonates.

L'invention concerne un procédé de fabrication d'hydroxydes métalliques ou de carbonates métalliques basiques par dissolution anodique de métaux correspondants et précipitation des hydroxydes ou des carbonates métalliques dans un milieu aqueux. Selon ce procédé, la dissolution anodique du constituant métallique est effectuée dans la chambre d'anode d'une cellule électrolytique à trois chambres ; une solution de sel auxiliaire aqueuse est alimentée en continu dans la chambre intermédiaire disposée entre la chambre d'anode et la chambre de cathode, et séparée de celles-ci par l'intermédiaire de membranes poreuses ; une solution de sel métallique au moins non-alcaline est extraite en continu de la chambre d'anode ; une solution de sel auxiliaire alcaline est extraite en continu de la chambre de cathode ; et, la solution de sel métallique au moins non-alcaline et la solution de sel auxiliaire alcaline sont épurées en dehors de la cellule électrolytique pour la précipitation d'hydroxydes métalliques ou de carbonates métalliques basiques.

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