SEPARATION AND RECOVERY OF NICKEL AND COBALT IN AMMONIACAL SYSTEMS.

摘要

PCT No. PCT/AU88/00144 Sec. 371 Date May 14, 1990 Sec. 102(e) Date May 14, 1990 PCT Filed May 19, 1988 PCT Pub. No. WO88/09389 PCT Pub. Date Dec. 1, 1988.A process for the separation and recovery of nickel from an ammoniacal ammonium carbonate liquor containing nickel II ions and cobalt III ions by liquid-liquid extraction where ammoniacal ammonium carbonate solutions are the only aqueous phases involved in the process. The process includes the successive steps of: (a) oxidizing the majority of any cobalt II ammines in the ammoniacal liquid to cobalt III; (b) extracting nickel from the ammoniacal liquor with an organic reagent, which reagent may also contain a suitable modifying reagent, to form a nickel loaded organic phase and an ammoniacal ammonium carbonate phase containing cobalt; (c) stripping the nickel loaded organic phase characterized by contacting the organic phase with an ammoniacal ammonium carbonate solution to form a nickel loaded aqueous strip liquor.