During separation process of copper and cobalt from nickel sulphate solution, the effects ofconstitutions and compositions of mixed extractant D2EHPA and PC88-A or Cyanex 272, hasbeen studied. In one step extraction cycle, the following results are obtained:[Ni]/[Co]>4000and [Ni]/[Cu]>40000 in nickel sulphate solution, [Co]/[Ni]>1000 and [Co]/[Cu]>30000 incobalt chlorinate solution, [Cu]/[Ni]>10000 and [Cu]/[Co]>200 in copper sulphate solution. Itwas elucidated that the above-mentioned synergistic mixtures can effectively separate cobaltand copper from nickel sulphate acid solution and achieve a greater synergistic effect.
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