Method and device for recovering metals with pulsating...

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 7/00 (2006.01) C02F 1/467 (2006.01) C22B 7/00 (2006.01) C23G 1/36 (2006.01) C02F 1/461 (2006.01)

Patent

CA 2439061

The invention relates to effective recovery of metals from process solutions and effluents by means of pulsating cathode currents, preferably with coupled anode processes. In order to obtain a metal deposit using a co-current flow in non-divided electrolyte cells or electrolyte cells which are divided by means of separators, the pulsating cathode currents are produced by dividing the anodes into stationary disposed strips in front of which the non-divided cathode surface passes. The current pulses formed on the cathode surface can be varied in form and frequency according to the arrangement of the anode strips and by current barriers. Preferably, a device with rotating cylinder cathodes and concentrically arranged anode pouches whose side walls act as current barriers and current breakers is used. The invention makes it possible to recover metals in an efficient manner, also ensuring coupling with various anode processes e.g. for the regeneration of peroxide sulphates and for oxidative decomposition of inorganic or organic harmful substances.

La présente invention a pour objet de permettre une récupération efficace de métal à partir de solutions de traitement et d'eaux usées, au moyen de courants cathodiques pulsatoires, de préférence couplés à des traitements anodiques. Afin d'obtenir un dépôt de métal grâce à du courant continu dans des cellules électrolytiques non séparées ou séparées par des séparateurs, les courants cathodiques pulsatoires sont produits grâce à la subdivision des anodes en bandes stationnaires au niveau desquelles on fait passer la surface cathodique non séparée. Les impulsions électriques ainsi produites sur la surface cathodique peuvent varier en forme et en fréquence selon la disposition des bandes anodiques et grâce à des barrières de courant. De préférence est utilisé un dispositif comprenant des cathodes cylindriques tournantes et des poches anodiques concentriques, dont les parois servent de barrières de courant et d'interrupteurs de courant. L'invention permet non seulement une récupération efficace de métal, mais aussi le couplage à différents traitements anodiques par exemple la régénération de sulfates de peroxyde et la dégradation par oxydation de substances polluantes minérales ou organiques.

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