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topic 9323

Cyanide Specific Resin?



Is there a DI resin that is specific to cyanide?

Ken Fefferman
- Chicago, Illinois, USA


Cyanides are very strongly removed by all strong base anion exchange resins that are in the hydroxide form. Metal-cyanide complexes are even more strongly removed by all forms of strong base resins, and cannot usually be regenerated efficiently. Metal cyanide complexes can, however, be regenerated from weak base ion exchange resins.

Some years ago, the Rohm and Haas company published several papers on using ion exchange for the selective removal of iron cyanide complexes. In this case, the selectivity for cyanide removal over sulfates, chlorides, etc. is extremely high because the iron-cyanide complex is tri-valent or quatro-valent whereas most anions are mono or di-valent. Regeneration is also possible.

I would need to know more about your specific situation to comment further.


Lyle Kirman
consultant - Cleveland, Ohio

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