Ammoniacal Etching of Copper

Dear Sir,

I have a prospect who recovers clean nickel from scrap nickel plated with solder and/or copper using ammonium chloride and ammonia solution. The resultant waste is blue spent etchant 2 Cu (NH3) 4 C 12 which requires further treatment.

Preliminary jar tests require 50-60 ml 18% liquid PAC per 1 liter wastewater (after ten times dilution) in coagulation and sludge volume is approximately 70%.

We are also evaluating ferric chloride ⇦ on eBay or Amazon [affil link] and TMT 15 as coagulants.

Please advise any alternative to treat these concentrated etchant 3 m3/day to comply with statutory requirement.

Thank you.

C. B. TAN
- Kluang, Johor, Malaysia
2001

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

No dead threads!
Your Q, A, or Comment puts this thread on The Finishing.com HOTLINE.

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: