Recovery of cobalt from spent copper leach solution.
Jeffers-TH; Gritton-KS; Bennett-PG
Recycle and secondary recovery of metals: proceedings of the International Symposium on Recycle and Secondary Recovery of Metals and the Fall Extractive and Process Metallurgy Meeting, December 1-4, 1985, Fort Lauderdale, Florida. Taylor PR, Sohn HY, Jarrett N, eds. Warrendale, PA: Metallurgical Society, 1987 Feb; :609-621
Cobalt, used in jet engine parts, tool steels, and catalysts, is a strategic and critical metal. The United States depends primarily on cobalt imported from Africa, but the long-term stability of that source is questionable. However, significant amounts of cobalt are present in some readily accessible spent copper leach solutions. For example, recovery of cobalt from existing streams at two U.S. copper leaching operations would yield about 1,500,000 lb/yr of cobalt, or 13 pct of our 1983 domestic consumption. The Bureau of Mines has developed a procedure using continuous ion exchange to extract cobalt from spent copper leach solution containing only 26 to 30 ppm carbon monoxide. The effects of aqueous flow rate, resin flow rate, and column height on cobalt extraction were investigated. Cobalt extractions of 92 pct or higher were achieved at solution flow rates of up to 5.5 gpm/ft2 of column cross-sectional area, and an aqueous-to-resin flow ratio of 40:1. Overall cobalt extraction increased as the column height increased, but cobalt extraction per unit of length was more efficient in a 12-ft-high column than in an 18-ft column. Solvent extraction procedures were utilized to purify and concentrate the ion exchange eluates and to produce a cobalt sulfate solution containing 80 g/l Co, 0.5 g/L Ni, and not more than 0.01 g/L Cu, Fe, Zn, or Al. Metallic cobalt cathodes containing over 99 pct Co were recovered by electrowinning this solution.
Metallurgical-processes; Metallurgy; Waste-treatment; Metals
OP; Conference/Symposia Proceedings
Taylor-PR; Sohn-HY; Jarrett-N
Recycle and secondary recovery of metals: proceedings of the International Symposium on Recycle and Secondary Recovery of Metals and the Fall Extractive and Process Metallurgy Meeting, December 1-4, 1985, Fort Lauderdale, Florida