Purification of Nickel-Containing Process Streams by Aliquat 336 Thiocyanate

CIM Bulletin, Vol. 69, No. 774, 1976

C. E. O'Neill, V. A. Ettel and A. J. Oliver, J. Roy Gordon Research Laboratory, Inco Limited, and I. J. Itzkovitch, Ontario Research Foundation, Mississauga, Ont.

A new solvent extraction process for the separation of cobalt, copper and zinc from nickel sulphate process streams has been developed. It involves selective extraction of these elements with a quaternary ammonium thiocyanate dissolved in an aromatic diluent. The chemical principles of this process have been investigated and are described, together with background physico-chemical data relating to the use of this solvent. Long-term, testing in a continuous "mini-plant" circuit gave high-purity^ nickel and cobalt products (Ni/Co ~2000/1 and Co/Ni ~1000/1 respectively).
Keywords: Hydrometallurgy, Solvent extraction, Cobalt, Copper, Zinc, Nickel sulphates, Effluent treatment.