Direct extraction of nickel from model sulfate solution with hydrazide of versatic tert-Carboxylic acids

Abstract

Possibility of direct extraction of 0.66 g L–1 Ni(II), 0.048 g L^–1 Co(II), and 0.024 g L^–1 Zn(II) in the presence of the nine commonly accompanying elements from a model solution for underground sulfuric acid leaching of an oxidized Ni ore with a 0.4–0.6 M solution of a hydrazide of Versatic C₁₅–C₁₉ acids in kerosene was considered. The optimal conditions of extraction, extract washing to remove impurities, and re-extraction of Ni and Co were determined. It was found that the direct extraction of up to 90% of nickel, cobalt, and zinc is possible with an at least fivefold concentration in the extraction stage. The separation of Ni from Co and co-extracted Fe, Zn, and Mn is possible in the re-extraction stage by washing of the organic phase with a 0.5 M HCl solution.