Abstract
The extraction behaviour of twelve metals as function of the concentration of nitric or hydrochloric acid is described; bis(2-ethylhexyl)phosphoric acid (BEHPA) and 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester are used as the extractants with 3:1 (w/w) biphenyl/ naphthalene (m.p. 52°C) as the molten solvent which is easily separated by cooling to room temperature. Scandium (III) and zirconium (IV) can be separated from uranium (VI), rare earth metals and some transition metals with BEHPA. The extraction behaviour of iron with both extractants is described in detail.
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