netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 8380

Ammoniacal Etching of Copper


(2001)

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 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



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.