首页|Separation of cobalt and nickel via solvent extraction with Cyanex-272:Batch experiments and comparison of mixer-settlers and an agitated column as contactors for continuous counter-current extraction
Separation of cobalt and nickel via solvent extraction with Cyanex-272:Batch experiments and comparison of mixer-settlers and an agitated column as contactors for continuous counter-current extraction
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NSTL
The separation of cobalt and nickel was carried out via solvent extraction using the commercial extractant bis(2,4,4-trimethylpentyl)phosphinic acid(Cyanex-272).Solvent extraction experiments were performed on a batch scale to optimize the extractant concentration,saponification degree,equilibration time,organic-to-aqueous phase ratio(O/A),and stripping conditions.High selectivity of cobalt over nickel was obtained at an extractant concentration as low as 0.2 M(or 20% v/v),with a saponification degree of 40% and a phase ratio 0/A of 1/1.Furthermore,eleven diluents,covering different aliphatic-aromatic compositions were tested to evaluate their effect on the separation of cobalt and nickel.Cobalt extraction efficiencies were not significantly impacted by the nature of the diluent.However,the co-extraction of nickel was approximatively 10% higher when toluene was used as a diluent in comparison with the aliphatic diluent Shell GS270.The process was validated in continuous mode using a battery of mixer-settlers and an agitated Klihni column.High recovery of cobalt and negligible co-extraction of nickel were achieved in both cases.The specificities,advantages,and challenges of the operation of both types of liquid-liquid extraction equipment were further discussed.
NSTL
