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Acid Cracking of Nickel Complexes

July 13, 2010

Can anyone help me in the process of acid cracking nickel complexes in my wastewater?
How is it done?
What pH values do I need to reach?
How long should the wastewater dwell at the specific pH?

Anything anyone can help with is appreciated.

Tim Hamlett, CEF
- West Palm Beach, Florida, USA

July 20, 2010

Complexes with what?

If the answer is 'cyanide', try chlorinating for 2 - 3 days with a good strong chlorine residual. The nickel will drop, with time. The best solution to that particular problem is not to create it in the first place - good waste segregation is the key.

If the answer is 'something else', try a sulfur based precipitant at a pH of something like 8. Most complexing agents are most active in the ionized form, and the lower the pH, the less ionized they will be.

Dave Wichern
Consultant - The Bronx, New York

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