| 摘要 |
The invention relates to a method of separating trivalent actinides from at least one trivalent lanthanide and/or yttrium, whereby the trivalent actinides are extracted from an aqueous solution containing a H+ concentration of 0.01 to 2 moles/liter by using as extractant an (aryl)dithiophosphinic acid of the Formula R1R2PS (SH), in which R1 is phenyl or naphthyl, R2 is phenyl or naphthyl, or R1 and R2 are each phenyl or naphthyl substituted by methyl, ethyl, propyl, isopropyl, cyano, nitro, or halogen, with addition of an extraction synergist selected from the group consisting of trioctylphosphate, tris-(2-propylpentyl)-phosphate, and tris-(2-ethylhexyl)-phosphate. The use of the synergist in the extraction allows for a more selective extraction.
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