Nickel and cobalt sepn. from aq. acid soln. - by extn. with thiocyanate contg. methyl isobutyl ketone with less loss of thiocyanate ions

摘要

Method for solvent utractial using thiocyanate ions to separate one metal from another in aq ueous soln. comprises adding to the soln. an inorganic acid to inhibit almost completely the ionisatial of the thiocyanate to thiocyanic acid. Hydrocyanic acid is removed from the aq. soln. using a water immiscible organic solvent, thus, minimising the loss of strength in thiocyanate ions. Process is used esp. for the sepn. of Co and Ni in acid soln. It can also be used to separate Be and Al; or Hf and Zr. The closed cycles giving thiocyanate and acid recovery cheapn the process.