METHOD FOR SEPARATING TRIVALENT ACTINIDES AND AT LEAST ONE TRIVALENT LANTHANIDE BY MEANS OF BIS(ARYL)ARYLDITHOPHOSPHONIC ACID AS ORGANOPHOSPHATE AS SYNERGIST

摘要

1. A method for separating trivalent actinides from at least trivalent lanthanides and/or lanthanum and/or yttrium, whereby said trivalent actinides are extracted from an aqueous solution containing a H+ concentration of 0.01 to 2 mol/1 by using an bis(aryl)dithiophosphonic acid of the general formula (4) wherein R1 and R2 are optionally substituted by at least one substituents selected from the group: methyl, ethyl, propyl, isopropyl, cyano group, nitro group, halogen in an organic solvent in a mixture of solvents with synergist additions, wherein at least one component of the group comprising trioctylphosphate, tris-(2-propypentyl)-phosphate or tris-(2-ethylhexyl)-phosphate as synergist. 2. The method according to claim 1, wherein an aromatic compound is used as an organic solvent. 3. The method according to claim 2, wherein at least one component of the group comprising toluol, xylol, tert.-butylbenzol, bis-(tert-butyl)-benzol, tris-(tert-butyl)-benzol, isopropylbenzol, bis(isopropyl) - benzol and tris(isopropyl)benzol. 4. The method according to any preceding claim, wherein trivalent americium 3+and/or urium 3+ actinides are subjected to a separation process. 5. The method according to any preceding claim, wherein at least one the trivalent actinides and lantanides containing in an aqueous phase is radioactive. 6. An extragent, wherein comprises at least one component of bis(aryl)dithiophosphinic acid of general formula (4) where R1 and R2 are phenyl or naphthyl, optionally substituted by at least one substituent selected from the group of methyl, ethyl, propyl, isopropyl, cyano group, nitro groupl halogen, and at least one component of the group comprising trioctylphosphate, tris-(2-propypentyl)-phosphate or tris-(2-ethylhexyl)-phosphate as synergist in an organic solvent. 7. The extagent according to claim 6, wherein the organic solvent is an aromatic compound. 8. The extagent according to claim 7, wherein the aromatic solvent is at least one of components of the group comprising toluol, xylol, tert.-butylbenzol, bis-(tert-butyl)-benzol, tris-(tert-butyl)-benzol, isopropylbenzol, bis(isopropyl) - benzol and tris(isopropyl)benzol. 9. Use of toluol, xylol, tert-butylbenzol, bis-(tert-butyl)-benzol, tris-(tert-butyl)-benzol, isopropylbenzol, bis(isopropyl) - benzol and tris(isopropyl)benzol as agents resulting in increased selectivity and/or increasing selectivity and/or increasing distribution coefficient at distribution of the trivalent actinides and the trivalent lanthanides and trivalent lanthanum and trivalent yttrium.