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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

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)63+ 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)63+ 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

ISSN 1672-7029
CN 43-1423/U

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