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"Platinum control in waste water"

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ICP readings show that Pt is 10 ppm ( after filtration through 1micron filters ) in 300 gallons of waste water. I would like to drop it down to 0.5 ppm. I would appreciate if anybody has any advice on a suitable chemical treatment, flocculant, chellating agent etc. to drop Platinum ( or Platinum Group Metals ) out of waste water.

Thanks in advance!

Ajit Menon
United Precious Metals, Inc. - Alden, New York

You didn't mention what the other chemicals in the waste solution are. However, ion exchange with anion and specialty resins has been successfully used to remove platinum and other platinum group metals from acid solutions, especially those that contain chlorides, and also alkaline cyanide solutions. Reclamation of the platinum is usually by burning the resin.

Lyle Kirman
- Newbury, Ohio

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