中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 11 No. 5 October 2001 |
copper by solvent extraction with P204
(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