Solvent Extraction of Copper (II), Nickel (II), and Cobalt (II) From Halide and Thiocyanate Solutions by Aldoximes

The extraction of divalent Cu, Ni, and cobalt from acidic chloride solutions with solutions of heptaloxime, nonaloxime, and 2-methyldekaloxime in toluene has been studied at 18 deg C. The influence of syn-anti isomerization of aldoximes on the extraction has been discussed. Taking into account association and syn-anti isomerization constants of aldoximes and organic phase, hydration of extracted complex and activities of salts in aqueous phase, effective extraction constants have been calculated for chloride solutions. Separation of Ni and Co from acidic chloride, bromide, and thiocyanate solutions by extraction with heptaloxime has been studied.