Equilibrium studies of cobalt(II) extraction with 2-pyridineketoxime from mixed sulphate/chloride solution

Abstract

In present paper the equilibrium of cobalt extraction with 1-(2-pyridyl)tridecan-1-one oxime from the chloride/sulphate solutions was studied. The presented results indicated that extraction depends on a number of process variables, including the pH, metal and Cl− concentration in the aqueous feed, and concentration of the oxime in the organic phase. The created cobalt-complexes with the 2-pyridine ketoxime were stable and only concentrated HCl was found to be a suitable stripping agent for coordinated metal. The separation of Co(II) from Zn(II), Ni(II) and Cu(II) was also studied, but the selective recovery of the metals was possible using the multi-stage stripping process.

Chelating Extractants for Metals

“…During extraction of cobalt (II) from chloride/sulfate solutions by oxime 1-(2-pyridyl) tridecan-1-one (compound 46) in toluene-decanol-1 mixture (9:1 vol./vol. ), it was found that the amount of extracted cobalt decreases with increasing acidity of water phase, increases with increasing concentration of extractant 46 and cobalt (II) ions, but does not depend on concentration of chloride ions [65]. At the same time, the explanation of the obtained dependences is not given in the work.…”

Solvent extraction of zinc(II) ions from chloride media by4-pyridylketoximes

“…Hydrophobic oximes of 2-and 4-pyridylketones were proposed to extract metal ions such as copper(II), cadmium(II), iron(III) and zinc(II) from chloride solutions [13][14][15][16][17]. These reagents were also used to remove copper(II) from ammonium chloride, hydrochloric solutions, sulphate and sulphate/chloride [18,19]. These studies showed the influence of the extractant structure, the type of diluents and presence of nitrate and chloride ions in aqueous feed on metal extraction.…”