The synergistic extraction of nickel and cobalt with a mixture of di(2-ethylhexyl) phosphoric acid and 5-dodecylsalicylaldoxime

The synergistic extraction of nickel and cobalt from acidic aqueous solutions has been observed with a mixture of di(2-ethylhexyl) phosphoric acid and 5-dodecylsalicylaldoxime. The rates of extraction and stripping were found to be rapid, even for nickel, and stripping of nickel-loaded organic phase was readily achieved by contact with 0.50 M mineral acid. The separation of nickel and cobalt is possible based on differences in stripping behaviors of the two metals. (C) 2001 Published by Elsevier Science B.V.