Cyanide wastes rendered harmless - by reacting with formaldehyde soln pref catalysed by ammonia

摘要

Cyanide wastes are rendered harmless by reacting the cyanide, in aq. alkaline soln., with calculated amt. of HCHO soln., esp. in slight, 1-2% excess. Pref. cyanide reaction is catalysed by ammonia water. Process can be applied for converting cyanide waste, in compact, loosely sprayed or diluted form, or as effluents, e.g. from precious metal industry.