Abstract: In present research,a novel extractant system(D2EHPA+naphthenic acid+pyridine-ester) was used to purify cobalt anolyte and a simulated industrial produc-tion were carried out.This novel extraction system can extract Cu and/or Ni against Co from chloride medium solutions at pH range of 2.5-4.5.About 2g/l nickel and 0.2g/l copper were removed from the cobalt chloride anolyte containing about 100g/l cobalt and 200g/l chloride ions respectively,the raffinate contains nickel and copper less than 0.03g/l and 0.0003g/l respectively and can be used to electrolyze high-purity cobalt.About 5.5t cobalt anolyte was purified in the simulation industrial experiment and kilogram quantities of cobalt of 99.9809CDAC7Curity and about 95recovery have been produced.

Key words: solvent extraction, nickel, cobalt,