| 摘要 |
<p>A process for separating metallic ions, in particular nickel ions, from aqueous solutions comprises a first stage in which the solutions undergo liquid membrane permeation and a second stage in which the enriched solutions undergo ordinary solvent extraction. The membrane phase from the first stage is used as the solvent phase during the second stage. The membrane phase contains a sulphur-containing organic phosphate compounds, the aqueous stripping phase has a mineral acid content between 1 and 5 mol/l, the ratio of the aqueous solution phase used to the solvent phase and the membrane phase is always greater than 1, and the liquid membrane permeation and the solvent extraction are carried out in a mixer-separator type of apparatus in which the separators are vertical and the static differential height between the mixer and separator can be chosen at will.</p> |
