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Recovery of Silver and Mercury From Mill Tailings by Electrooxidation.

PB211946

Publication Date	1972
Personal Author	Scheiner, B. J.; Pool, D. L.; Lindstrom, R. E.
Page Count	16
Abstract	Extraction of silver from silver mill tailings by an electrolytic oxidation procedure was investigated. Various parameters affecting silver extraction, such as electrolysis time, particle size, and dissolution of the silver as the tetrachloro or cyanide complex, were studied at 30C with an electrolyte concentration of 20 weight-percent sodium chloride. Resulting silver extractions ranged from 77 to 90 percent, depending on the tailings being treated. Concomitant extraction of mercury ranged between 90 and 95 percent. Power consumption was 52 to 90 kilowatt hours per ton for the tailings investigated. Comparative experiments using direct cyanidation resulted in extraction of 46 to 82 percent of the silver and 20 percent of the mercury. Cyanide consumption varied from 3.3 to 9.4 pounds per ton of tailings, depending on the tailings being treated. Silver and mercury were recovered from leach solutions by precipitation on iron powder, followed by conventional distillation and fire refining steps. (Author)
Keywords	Silver Electrowinning Mercury Tailings Materials recovery Hydrometallurgy Leaching Oxidation Hypochlorites Chlorides Cinnabar Cyanides Electrooxidation
Source Agency	Invalid Source Agency Code
NTIS Subject Category	71J - Iron & Iron Alloys
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	Prepared in cooperation with Reno Metallurgy Research Center, Nev.
Document Type	Technical Report
Title Note	Rept. of Investigations.
NTIS Issue Number	197221

Recovery of Silver and Mercury From Mill Tailings by Electrooxidation.

Recovery of Silver and Mercury From Mill Tailings by Electrooxidation.
PB211946

Publication Date	1972
Personal Author	Scheiner, B. J.; Pool, D. L.; Lindstrom, R. E.
Page Count	16
Abstract	Extraction of silver from silver mill tailings by an electrolytic oxidation procedure was investigated. Various parameters affecting silver extraction, such as electrolysis time, particle size, and dissolution of the silver as the tetrachloro or cyanide complex, were studied at 30C with an electrolyte concentration of 20 weight-percent sodium chloride. Resulting silver extractions ranged from 77 to 90 percent, depending on the tailings being treated. Concomitant extraction of mercury ranged between 90 and 95 percent. Power consumption was 52 to 90 kilowatt hours per ton for the tailings investigated. Comparative experiments using direct cyanidation resulted in extraction of 46 to 82 percent of the silver and 20 percent of the mercury. Cyanide consumption varied from 3.3 to 9.4 pounds per ton of tailings, depending on the tailings being treated. Silver and mercury were recovered from leach solutions by precipitation on iron powder, followed by conventional distillation and fire refining steps. (Author)
Keywords	Silver Electrowinning Mercury Tailings Materials recovery Hydrometallurgy Leaching Oxidation Hypochlorites Chlorides Cinnabar Cyanides Electrooxidation
Source Agency	Invalid Source Agency Code
NTIS Subject Category	71J - Iron & Iron Alloys
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	Prepared in cooperation with Reno Metallurgy Research Center, Nev.
Document Type	Technical Report
Title Note	Rept. of Investigations.
NTIS Issue Number	197221