Extraction/Separation of Cobalt by Solvent Extraction: A Review

Abstract

Extraction/separation of cobalt by solvent extraction is reviewed. Separation of cobalt using various reagents and also cobalt recovery from scrap using commercial extractant were analyzed. The separation ability for cobalt followed the order of phosphinic > phosphonic > phosphoric acid due to the increasing stabilization of tetrahedral coordination of cobalt complexes with the extractant in the organic phase. Depending upon the solution composition, commercial extractants like Cyanex 272, D2EPHA and PC 88A should primarily be used for commercial extraction processes and also the efficient management of their combination could address various separation issues associated with cobalt bearing scrap.

Leaching and Recovery of Rare-Earth Elements from Neodymium Magnet Waste Using Organic Acids

“…The leaching efficiency of Co was also slightly affected by increasing the S:L ratio; it increased from 86.11 ± 0.38% at 1/30 g/mL to 93.92 ± 1.70% at 1/80 g/mL. For industrial purposes, it can be extracted from the leachate using Cyanex 272 (di-(2,4,4-trimethylpentyl) phosphinic acid) at equilibrium pH 4-5 [34]. Changing the S:L ratio from 1/30 to 1/80 g/mL did not, however, affect the leaching efficiency of Nd, Pr, and Dy, which stayed the same across the S:L ratio.…”

Applied novel functionality in separation procedure from leaching solution of zinc plant residue by using non-aqueous solvent extraction

“…Many strategies may be mentioned to recover cobalt from industrial effluents, including solvent extraction, chemical precipitation, ion exchange, bio-sorption, membrane processes, and aqueous two-phase systems 15 – 17 . Specific methods have been employed in the past to separate and purify various metals from primary and secondary resources 18 – 21 . Due to its remarkable selectivity and significant cost savings, solvent extraction is one of the most commonly used procedures in hydrometallurgy and on an industrial scale to separate and purify cobalt ions 22 – 25 .…”

8-Hydroxyquinoline Anchoring 3-D Networking Silica Gel Utilizing Its HOMO as a Metal Trapping Center for Selective Sample Cleanup of Cu(II), Cr(III), and Co(II) and Chemical Speciation of Sorbed Species

“…This necessitates an efficient preconcentration and matrix-removal step(s) to assure the accuracy and precision of the analytical results. The most widely accepted techniques for the enrichment and separation include membrane filtration, coprecipitation, cloud point extraction,solvent extraction, ion-exchange, solvent sublation, and solid-phase extraction. ,− Among these, solid-phase extraction, because of its simplicity, cost effectiveness, speed, high enrichment factors, absence of emulsion, lower consumption of reagents, and eco-friendliness creates huge attention from analytical chemists. Although the separation and preconcentration of Cu­(II)-Co­(II), − Co­(II)-Cr­(III), − and Cu­(II)-Cr­(III) , through solid-phase extraction are found to be much available in the literature, the concomitant separation of Cr­(III), Co­(II), and Cu­(II) (from their ternary and multicomponent mixtures) at trace levels through solid-phase extraction is found to be scanty − and the methodologies so far adopted were found to be much complicated and lengthy and the chelators were not recyclable.…”

“…12 This necessitates an efficient preconcentration and matrix-removal step(s) to assure the accuracy and precision of the analytical results. The most widely accepted techniques for the enrichment and separation include membrane filtration, 13 coprecipitation, 14 cloud point extraction, 15 solvent extraction, 16 ion-exchange, 17 solvent sublation, 18 and solid-phase extraction. 5,19−21 Among these, solidphase extraction, because of its simplicity, cost effectiveness, speed, high enrichment factors, absence of emulsion, lower consumption of reagents, and eco-friendliness creates huge attention from analytical chemists.…”