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Silver Recovery from Cyanide Tailings Using an Acidic Nacl-fecl2 Leachant.
MISSING :7 pages
In keeping with its mission to maximize mineral and metal recovery from domestic sources, the Bureau of Mines investigated a method to extract silver from tailings not amenable to cyanidation. Results of a laboratory study on the recovery of silver from cyanide tailings containing 1.7 Ounces of silver per ton by leaching with an acidic ferrous chloride-sodium chloride solution are presented. The effects of reagent concentration and reaction time on the leaching of silver were investigated. A leaching solution containing 5 wt- pct nacl, 2.5 wt-pct fecl2, and 1.2 wt-pct hcl (for acidity) extracted 82 pct of the silver from the tailings during a 24-hour leach. The amount of hcl consumed during the leach was 46 pounds of hcl per ton of feed. Only 23 pct of the silver was extracted by conventional cyanidation. Ninety-nine percent of the silver was recovered from the pregnant solution by cementation onto iron powder.
IH; Report of Investigations
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division