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The present study investigated the purification of nickel sulfate by solvent extraction with Cyanex 272 (bis(2,4,4-trimethylpentyl) phosphinic acid) and mixtures of Cyanex 272 with Versatic 10 (neodecanoic acid). Batch scale tests were carried out using a laboratory multicomponent aqueous sulfuric solution with metal ion concentration similar to those typically found in High Pressure Acid Leaching...