Summary for thermal destruction of cyanide fumes Discussion
Thermal destruction of cyanide fumes is questioned by Francis James, who asks what temperature would be needed to thermally destroy cyanide fumes or gases from material in an induction furnace process. In reply, an answerer notes that firefighters often worry about hydrogen cyanide in fire situations, especially from pyrolysis of polyurethane furniture, and says this suggests high temperature alone is unlikely to effectively destroy HCN. The practical advice given is to identify the source of the cyanide and prevent it from entering the furnace in the first place, rather than relying on thermal destruction after the fact. The thread does not provide a specific destruction temperature, and the answer emphasizes source control and prevention as the safer approach.
March 2, 2012
Q. At what temperature can I thermally destroy Cyanide fumes or gases from material in an induction furnace process?
Francis James
I am health safety and environmental manager – Biddeford, Maine, USA
A. Hi Francis
Fire fighters are frequently concerned by cyanide fumes created in a fire situation, often from pyrolysis of polyurethanes in furniture.
It seems unlikely therefore that high temperature will effectively destroy HCN.
Your first step should be to find the source of the cyanide and ensure that it does not enter the furnace.

Geoff Smith
Hampshire, England
A. I am reasonably sure that some cyanide was destroyed by waste treatment companies a long time ago. I have no current knowledge.
As I remember, it was about 5,000 degrees. A problem that they had with EPA was the residence time which was only a couple of seconds.
I have my doubts if an induction furnace could be used.
James Watts
– Navarre, Florida
April 19, 2012