Valuable metals, such as cobalt, can be recoveredfrom slags by treating these waste materials with a carbonaceousreducing agent in a Dc-arc furnace. This technology isapplicable to the recovery of nickel, cobalt, copper, andplatinum group metals from furnace or converter slagsemanating from copper or nickel smelters treating sulphideconcentrates. Pilot-plant testwork at Mintek has demonstratedrecoveries of 98 percent for nickel and over 80 percent forcobalt, at power levels of up to 600 kW. Results of computersimulations and experimental tests are presented.
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