Purification of Cobalt Chloride Solutions from Impurities by Mixtures of Extractants

Abstract

The purification of cobalt chloride solutions from iron, copper and nickel by mixtures of extractants have been conducted. The composition of solutions obtained after dissolution of cobalt concentrate was in g/1: 150-180 Co, 12-18 Ni, 1-2 Cu, 5-8 Fe, and 10-15 HCl. Monocarboxylic acids with straight or branched chains were used as one of the components of extraction mixture and as the solvent. For purification of solutions from iron, 0.2-0.3 M solutions of tertiary amines in monocarboxylic acids were used. A mixture of monocarboxylic acids and aliphatic non-chelating aldoximes (heptaloxime) was used for purification of solutions from copper. Aldoximes concentration in the mixture was 0.2-0.25 M. For nickel extraction 1.5-2.0 M solution of heptaloxime in monocarboxylic acids was used. Stripping was conducted by hydrochloric acid solution 5-15 g/ 1. The purification of cobalt solutions from impurities by these extractants was effective. Thus, the separation coefficients are for iron/cobalt - 5 x 104, for co...