Letter 6040

What do you know about cyanide treatment 

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I need information about cyanide treatment by hexavalent chromium or another method.

with special thanks

n_pargali
nasir toos industrial complex - mashad , khorasan , Iran

Hello, Mr. Pargali. The question should not be what do we know, since this letter will be read by dozens or hundreds of experts, but what do you know--because it is difficult to figure out the right starting point when we don't know your level of understanding .

I have not heard of treating cyanide by hexavalent chromium and cannot recommend it. Cyanide and hexavalent chromium should be treated separately first.

The cyanide must be kept at a high pH (about 10.5-11.0) while an excess of bleach (sodium hypochlorite) is added to oxidize the cyanide and eliminate it. Acidifying cyanide-bearing waste with hexavalent chromium or any other acid can release deadly HCN gas. Good luck and consider some hands-on training because this can be dangerous. Thanks.

Ted Mooney, P.E.  finishing.com Brick, New Jersey

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