No registration, no passwords; no pop-up ads -- just aloha, fun, & authoritative answers.
As an eBay Partner & Amazon Affiliate we receive compensation for qualifying purchases.
Home /
Search 🔍
the Site
pub  Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Problems With RotaCat Copper Recovery System Danglers

Disambiguation: If your interest is actually in danglers for plating barrels, please see:
Thread 6364, "Plating barrel danglers and other maintenance problems" and
Thread 17769, "Q&A's Problems & Solutions for Plating barrel danglers"

Q. As part of our waste treatment operations we operate a "RotaCat" 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

A. I'm not familiar with that "RotaCat" system, but assume this is specially designed for use as an electrolytic plate-out cell; not a standard plating barrel.

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 danglers 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.

Tell us more about this electrolytic recovery cell.

Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

A. 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 Software
supporting advertiser
Mabank, Texas USA
Anoplex logo

Q. I just wanted to know whether only copper can be taken out from Rota cat which is dissolved in sulfuric 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 sulfuric acid

Would be delighted to have an asnwer.

Vidu Goyal
- Delhi, India

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact  -  Privacy Policy  -  ©1995-2024, Pine Beach, New Jersey, USA  -  about "affil links"