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Flotation of Cobalt-rich Ferromanganese Crust from the Pacific Ocean.
Hirt WC; Rice DA; Shirts MB
SME Preprint 90-86 1990 :13 pages
Deposits of ferromanganese crust containing cobalt and nickel occur on the seafloor in the Pacific Ocean near the Hawaiian Islands and johnston atoll. This paper describes developmental flotation metallurgy to separate crust from its associated substrate gangue. Important variables in ferromanganese crust flotation include reagent type, aeration rate, conditioning time, agitation intensity, ph, temperature, water type, and feed size distribution. Flotation in seawater of minus 600-um (--28-mesh) material assaying 6.2 pct mn, 0.2 pct CO, and 0.13 pct ni with diesel fuel-crude tall oil- sulfonate collectors produces concentrates assaying 15 pct mn, 0.6 pct CO, and 0.3 pct ni with recoveries of 89 to 95 pct while removing 62 pct of the feed weight.
SME Preprint 90-86, 1990, 13 PP.
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