Curated with aloha by
Ted Mooney, P.E. RET
The authoritative public forum
for Metal Finishing 1989-2025
-----
Ferricyanide Removal / Destruction for disposal
Due to the regulations on the ferricyanide in the Alodine 1200s the company I work for has switched over to Alodine 600. However, this means that I must dispose of the 1200s and it's dragout, before doing this I must neutralize the ferricyanide within the 1200s. I am planning on neutralizing the ferricyanide with 1.5 lb of zinc sulphate ⇦ this on eBay or Amazon [affil links] per 0.1% of. Does anyone know a titration to find out the % of ferricyanide within the 1200s? Or is there a better method for removing the ferricyanide?
Benjamin Curto- Ponderay, Idaho, USA
2000
2000
That sounds like it should work fine. I'd suggest the following:
1) Reduce the ferricyanide to ferrocyanide with sodium metabisulfite first.
2) The lowest levels obtainable with this technique result when the iron cyanides are precipitated at pH 6 - 7, then the residual zinc and other metals removed in a second step.
3) If manganese is not regulated in your area, it may be substituted for the zinc and simplify the treatment process.
Good Luck,
Dave Wichern
Consultant - The Bronx, New York
Q, A, or Comment on THIS thread -or- Start a NEW Thread