-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
on this site
current topics

topic 4399

Nitric Acid filtration of heavy metals


We are a zinc die caster/Plater (same facility), and use nitric acid to strip our built-up plating racks. The spent nitric is being sent off site. I have read an article that suggests using an "Ultrafilter"loop to remove the heavy metals, and prolong the life of the nitric, or can reduce it's composition of heavy metals; than it can be disposed of in a more effective method. This makes sense since it is the heavy metals that are causing the classification that makes the nitric such a problem.

First question, Is anyone using this technique, and if not, does it make sense ?

Joseph DeAmicis
Academy - Edison,New Jersey



You did not mention what type of plating you are doing but, since you are using Nitric Acid to strip your racks I am assuming you are either doing Nickel, Chrome, or Copper plating.

We manufacture a Diffusion Dialysis system which has been effective in recovering nitric acid from all three of these processes. You are correct in stating that the resulting waste stream is much more easily waste treated. Contact me if you would like to discuss this further.

Tony D'Amato
Zero Discharge Technologies Inc. - Chicopee, Massachusetts

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 Comment to THIS thread START a NEW threadView CURRENT 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

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.