Separation of nickel, cobalt and <BR>copper by solvent extraction with P204

ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 11 No. 5 October 2001

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Separation of nickel, cobalt and
copper by solvent extraction with P204

QIAN Dong（钱东），WANG Kai-yi（王开毅），CAI Chun-lin（蔡春林），
PAN Chun-yue（潘春跃），TANG You-gen（唐有根），JIANG Jin-zhi（蒋金枝）

(College of Chemistry and Chemical Engineering,
Central South University, Changsha 410083， P.R.China)

Abstract: Nickel, cobalt and copper were separated by solvent extraction with P204. The experimental results show that ［Co(NH₃)₆］³⁺ is an inert complex in extraction kinetics, therefore cobalt can be separated from nickel and copper by non-equilibrium solvent extraction. Under the conditions of temperature 25℃,contact time of two phases 10min, phase ratio 1∶1, aqueous pH 10.10 and concentration of P204 20%,［Co(NH₃)₆］³⁺ is hardly extracted by P204, while the percentage extractions of nickel and copper are 79.3%and 93.9% respectively. Nickel and copper are separated by equilibrium solvent extraction with P204. Under the conditions of temperature 25℃,contact time of two phases 1 min,phase ratio 1∶1, equilibrium pH 4.01 and concentration of P204 20%,the separation factor of copper and nickel is 216.

Key words: non-equilibrium solvent extraction; equilibrium solvent extraction; nickel; cobalt; copper; di(2-ethylhexyl) phosphate

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