Separation and Recovery of Cobalt from Copper Leach Solutions.
Pres Metall Soc AIME 113th Annu Meeting Los Angeles, California, 1984 Feb; :8 pages
The Bureau of Mines developed a procedure using a chelating ion- exchange resin to successfully extract cobalt from a ph copper- processing solution containing only 30 mg/l cobalt. Cyclic tests with the commercial resin xfs-4195 in 4-ft-high by 1-in-diam columns gave an average cobalt extraction of 95 pct when 65 bed volumes of solution were processed at a flow rate of 4 gpm/ft2. Elution of the cobalt using a 50-g/l sulfuric acid solution yielded an eluate containing 0.5 G/l cobalt. Nickel, copper, iron, zinc, and aluminum were coextracted with the cobalt and also appeared in the eluate. Selective elution of the loaded resin and solvent extraction procedures using di-2-ehtylhexyl phosphoric acid and cyanex 272 removed the impurities and produced a cobalt sulfate solution containing 25 g/l cobalt.
Pres. Metall. Soc. AIME 113th Annu. Meeting, Los Angeles, California, Feb. 26-Mar 2, 1984, 8 Pp