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Concentrating a Complex Cobalt and Nickel Sulfide from Missouri Lead Ores by Continuous Froth Flotation.

Cornell-WL; Holtgrefe-DC; Sharp-FH
Paper in Complex Sulfides-proc Ores conc &by-prod metall soc AIME 1985 :181-193
The Missouri lead ores are the only domestic sources of cobalt presently being mined and processed for other materials. They therefore represent the best short-term solution for meeting up to 20 pct of U.S. strategic and critical cobalt needs from domestic sources. At present, the cobalt is lost as an impurity in the cu, pb, and zn concentrates and in the mill tailings. This paper presents research to enumerate the problems encountered in recovering cobalt from the copper concentrate on a continuous basis under actual mill conditions; to present alternative solutions to these problems; and finally, to describe what is presently the best available technology for cobalt recovery within the imposed constraints. Flotation was chosen as the method for recovery because of easy adaptation by the mills. In the best cases, when feeds in excess of 0.8 Wt pct CO were encountered, cobalt recoveries in excess of 80 wt pct at grades as high as 8.2 Wt pct were achieved. On average, however, cobalt recoveries of 60 wt pct at grades of 2.0 Wt pct on feeds containing less than 0.4 Wt pct would be typical.
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OP 6-86
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Paper in Complex Sulfides-proc. Ores,conc.&by-prod.,metall.soc. AIME, 1985, PP. 181-193