Silver Extraction from Marginal Resources.
Heinen-HJ; Peterson-DG; Lindstrom-RE
NTIS: PB/86-245917 :17 pages
Modification of conventional cyanidation processess are being investigated by the Bureau of Mines to develop more efficient methods of extracting silver values from mine wastes and low-grade and refractory ores. One technique developed involves the selective precipitation of silver as ag2s from cyanide solutions followed by recovery of residual gold values on activated carbon. Carbon-in- pulp cyanidation appears promising for processing slimy tailings with the development of an efficient technique for stripping silver from loaded carbon with alkaline ethanol solutions at ambient temperature and pressure. Salt roasting-cyanidation treatment of a refractory ore gave 88% silver extraction compared with 60% attained by conventional cyanidation. The chloridized calcine is amenable to percolation or heap leaching with dilute cyanide solution.
NTIS Accession No.
U.S. Bureau of Mines Reno Res.