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topic 3735

Problems With Plating Barrel Danglers


As part of our waste treatment operations we operate a "Rota-Cat" type barrel plater to plate copper out of copper microetchants. The problem I have is that the danglers in the barrel plate up to the point where the weight of the "seed" in the plater and the Dangler itself literally tear the end of the dangler off or destroy the cable to the dangler end. We use 1/2 diameter copper balls as seed and plate them to approximately 1" diameter before removing and replacing the seed - about a 5x weight increase in the seed. The danglers are fixed on #3 welding cable and are 3/4" x 2.5" cylindrical copper on the end.

Brad Dirkman
- Fergus Falls, Minnesota


I'm not familiar with the name "Rota-cat", and don't know if this is a barrel specially designed for use as an electrolytic plate-out cell; but I wouldn't think a standard plating barrel would be as good a plate-out cell as a piece of machinery designed for the purpose.

It seems to me that as these seeds grow, they probably have a strong tendency to grow together, to form a welded together mass that would tear off any dangler ensnarled in it. Unfortunately, all other cathode contact arrangements that I am familiar with have moving parts, some sort of casual "brushes" arrangement, that would probably plate over and freeze up in short order.

Enlighten me as to why a simple electrolytic recovery cell is not the right tool for this application.

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


Try a floating rod dangler. That way the media will rotate around the dangler and won't shear it off as the weight and size increase. You'll have to fill the barrel about 1/2 full for optimum contact. If the media gets too large you can always pull some out.

jim conner
Jim Conner
Anoplex - Dallas, Texas USA


I just wanted to know whether only copper can be taken out from Rota cat which is dissolved in sulphuric acid or Rota cat can be used to recover metals like

nickel in hydrofluoric acid
chromium in hydrofluoric acid
iron in hydrofluoric acid
zinc in sulphuric acid

Would be delighted to have an asnwer.

Vidu Goyal
- Delhi, India

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