Cell for the recovery of metals from dilute solutions

C - Chemistry – Metallurgy – 25 – C

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C25C 1/00 (2006.01) C25C 7/00 (2006.01)

Patent

CA 2169482

An electrochemical cell is provided for removal of metals such as copper, lead, silver, tellurium, platinum, palladium or nickel from dilute solutions of the metal. The cell comprises a porous tubular support (18) which is provided with a cathode comprising a porous carbon fibre material (19), a current feeder (15) for the cathode, a tubular anode (12) spaced from said cathode, a current feeder (16) for the anode, the anode and the cathode being enclosed by a non-porous outer casing (11). In use the dilute solution from which the metal is to be removed is introduced into the cell through an inlet (13) and flows through the porous carbon fibre cathode to an outlet (14). The cell is useful for removing harmful metals from wastes so that they are environmentally acceptable for disposal and for recovery of valuable metals.

L'invention se rapporte à une cellule électrochimique apte à être utilisée dans la récupération de métaux tels que le cuivre, le plomb, l'argent, le tellure, le platine, le palladium ou le nickel dans des solutions diluées du métal. La cellule comprend un support tubulaire poreux (18) qui est pourvu d'une cathode comprenant un matériau poreux en fibre de carbone (19), une amenée de courant (15) pour la cathode, une anode tubulaire (12) espacée de la cathode, une amenée de courant (16) pour l'anode, l'anode et la cathode étant enfermées par une enveloppe externe non poreuse (11). Lors de l'opération, la solution diluée de laquelle le métal doit être retiré est introduite dans la cellule par un orifice d'admission (13) et s'écoule dans la cathode poreuse en fibre de carbone pour se diriger vers un orifice d'évacuation (14). La cellule est utilisée pour retirer des métaux dangereux provenant de déchets, de sorte qu'ils puissent être évacués sans nuire à l'environnement, et également pour récupérer des métaux de valeur.

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