Control agent for reducing metal acid mist emissions from...

C - Chemistry – Metallurgy – 25 – D

Patent

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C25D 21/11 (2006.01)

Patent

CA 2258088

Disclosed is a method for inducing metal acid or salt evolved from electrolytic baths housed in electrolytic tanks during electrolytic operations. This method involves covering all of the surface of the electrolytic bath with a layer of shredded foam (e.g., polymeric foam, metal foam, glass foam, or vitreous material foam). The shredded foam is irregular in shape, lacking in uniform particle size, is inert to the electrolytic operation, and floats at the surface of the electrolytic bath. Desirably, the layer of shredded foam is about 3 to 4 inches (76-102 mm) in thickness. Examples of specific processes benefiting from the present invention are anodizing, electroplating, electrowinning, and electrophoresis operations.

L'invention concerne un procédé visant à réduire, pendant les opérations d'électrolyse, l'acide ou le sel métallique provenant de bains électrolytiques renfermés dans des cuves électrolytiques. Ledit procédé consiste à recouvrir toute la surface du bain électrolytique d'une couche de mousse effilochée (par exemple, une mousse de polymère, de métal, de verre ou d'une autre matière vitreuse). Cette mousse effilochée est de forme irrégulière, les particules qui la composent ne sont pas de taille uniforme, elle est inerte à l'électrolyse et flotte à la surface du bain électrolytique. L'épaisseur de la couche de mousse effilochée est de préférence d'environ 3-4 pouces (76-102 mm). Parmi les processus pour lesquels l'invention constitue un avantage, on citera les opérations d'anodisation, de galvanoplastie, d'extraction électrolytique et d'électrophorèse.

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