Biological and Chemical Cyanide Destruction from Heap Leachates and Residues.
Lien-RH; Dinsdale-BE; Altringer-PB
Ch 18 in Environmental Management for the 1990'S AIME 1991 :11 pages
The U.S. Bureau of Mines is investigating biological and chemical decontamination of cyanide-containing leachates and residues. Biological cyanide oxidation, using bacteria isolated from a precious metals tailings pond, destroyed > 85 pct of the cyanide in several processing solutions containing up to 280 ppm cn. Reaction time varied from about 4.5 Hr in a trickling reactor using quartz as a bacterial substrate to 2 months in unagitated, covered flasks. Chemical techniques were used to destroy the remaining complexed cyanide down to 1 ppm. Exploratory tests were also conducted using spent ore from heap leach operations as the bacterial substrate to determine if biological cyanide oxidation could be used to destroy the residual cyanide in spent heaps.
Ch. 18 in Environmental Management for the 1990'S. AIME, 1991, PP. 123-133