Abstract

Controlled sulphide precipitation was examined in this study for the recovery of copper and nickel–cobalt concentrates from liquors originating from leaching manganese deep ocean nodules in FeSO 4–H 2SO 4–H 2O solutions. The metal ions studied include Co 2+, Cu 2+, Fe 2+, Ni 2+, Mn 2+ and Zn 2+. Promising results were obtained when copper and nickel–cobalt concentrates were precipitated with 5.5% solution of (NH 4) 2S. This was added at optimised flow rate of 0.15 g S 2−/min per 1 L of processed solution at the laboratory temperature, pH=1.0 (copper precipitation) and pH=3.0 (nickel–cobalt precipitation).

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