| 摘要 |
<p>A method for the recovery of nickel and/or cobalt from nickel and cobalt containing ores or concentrates, the method comprising the steps of:subjecting a nickel and cobalt containing ore or concentrate to acid pressure leaching thereby forming a process solution containing nickel ions, cobalt ions and residual ions of one or more impurity metals;treating the process solution containing nickel ions, cobalt ions and residual impurity metal ions with one or more alkaline agents to induce the precipitation of a mixed metal hydroxide of nickel, cobalt and some of the impurity metals;separating the mixed hydroxide from the supernatant solution;leaching the mixed metal hydroxide with an ammoniacal ammonium sulphate solution to produce a solution of nickel and cobalt amine complexes and thereby rejecting the majority of the impurity ions;substantially separating the cobalt ions from the nickel ions by solvent extraction in alkaline conditions; subjecting the predominantly nickel-containing aqueous phase to hydrogen reduction to produce metallic nickel and ammonium sulphate; andrecycling the ammonium sulphate so produced to the ammonium sulphate leaching step.</p> |
