Process for electrochemically dissolving a metal such as...

C - Chemistry – Metallurgy – 25 – F

Patent

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Details

C25F 5/00 (2006.01) C22B 3/04 (2006.01) C22B 7/00 (2006.01) C22B 19/30 (2006.01) C22B 25/06 (2006.01)

Patent

CA 2195460

The object of the invention is to provide for an improved electrochemical dissolution process for electrochemically dissolving a first metal by simultaneously creating hydrogen evolution at a second metal, the second metal being a metal that has a larger current exchange density for hydrogen evolution than the first metal, both metals being immersed in an aqueous electrolyte system, wherein the first metal and the second metal are galvanically coupled. By taking measures to reduce inhibition of said hydrogen evolution at said second metal the rate of dissolution of the first metal is enhanced. The measures to reduce said inhibition comprise suitably selecting temperatures and concentrations of the electrolyte, dividing the electrolyte into two fluids coupled by a selectively permeable device and suitably selecting the resistance value of a connecting means electrically connecting the first and the second metal. The invention is particularly useful for removing Zn or Sn from Zn- or Sn- containing steel scrap.

L'invention concerne un procédé perfectionné pour la dissolution électrochimique d'un premier métal en créant simultanément un dégagement d'hydrogène au niveau d'un deuxième métal, ce deuxième métal étant un métal présentant une densité d'échange de courant pour le dégagement d'hydrogène plus importante que le premier métal, les deux métaux étant immergés dans un système électrolytique aqueux permettant le couplage galvanique du premier métal et du deuxième métal. Des dispositions destinées à réduire l'inhibition de ce dégagement d'hydrogène au niveau du deuxième métal permettent d'augmenter la vitesse de dissolution du premier métal. Ces dispositions consistent à choisir convenablement les températures et les concentrations de l'électrolyte, à le diviser en deux fluides couplés par un dispositif à perméabilité sélective, et à choisir convenablement la valeur de résistance d'un moyen de connexion reliant électriquement le premier et le deuxième métal. L'invention est particulièrement utile pour éliminer le zinc ou l'étain contenu dans la ferraille d'acier.

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