Use of complexones for the extraction separation of rare earth and transplutonium elements with amines

Kopyrin, A. A.; Murashov, V. D.; Demidov, V. D.; Shvedov, V.P.

doi:10.1007/bf02519921

Cited by 2 publications

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“…The separation of REE in the extraction system Ln(NO3)3 -NH4NO3 (LiNO3) -H20-EDTA-NOPC can be achieved by two ways: -the extraction at variable pH of the aqueous phase and of concentration of complexon, e.g. in radiochemical isotopes separation techniques [1][2][3]; -the extraction in conditions of complete bonding of REE(III) by complexing ion at high concentration of salting-out agent, that is used for the industrial separation of REE [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The extraction systems on the basis of NOPC, ammonium nitrate and EDTA are used commercially for the separation of heavy REE and yttrium [1][2][3]. The separation of REE in the extraction system Ln(NO3)3 -NH4NO3 (LiNO3) -H20-EDTA-NOPC can be achieved by two ways: -the extraction at variable pH of the aqueous phase and of concentration of complexon, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Separation of rare earthes by extraction with neutral organophosphorus compounds in presence of complexones

1999

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Physico-chemical and mathematical models of distribution of lanthanides(III) between watersalt solutions, containing salting-out agents, complexones (ethylendiaminetetraacetic (EDTA) and diethylen-thriaminepentaacetic acids (DTPA)) and neutral organophosphorus compounds (NOPC) are introduced. Examples of separation of rare earth elements concentrates with application of NOPC, complexones and ammonium nitrate is considered. IntroductionRare earth elements(III) complexonates are widely used for the separation of rare earth elements (REE) by liquid extraction. The extraction systems on the basis of NOPC, ammonium nitrate and EDTA are used commercially for the separation of heavy REE and yttrium [1][2][3]. The separation of REE in the extraction system Ln(NO3)3 -NH4NO3 (LiNO3) -H20-EDTA-NOPC can be achieved by two ways: -the extraction at variable pH of the aqueous phase and of concentration of complexon, e.g. in radiochemical isotopes separation techniques [1-3]; -the extraction in conditions of complete bonding of REE(III) by complexing ion at high concentration of salting-out agent, that is used for the industrial separation of REE [1-8].For the description of extraction processes in the systems Ln(NO3)3 -NH4NO3 (LiNO3) -H20-EDTA (DTPA) -NOPC we invoke the following definitions: the system mentioned above contains N-ions of metals; CZ(w)is total concentration of a sum of REE in the aqueous phase; C~(0) -total concentration of a sum REE in the organic phase; Ck(w) -concentration of an individual metal ion in the aqueous phase; ck(0) -concentration of an individual metal ion in the organic phase; C~ -total concentration of solvent; Cv -total concentration of complexon; ~k(w) and ak(0)-fraction of individual REE in the aqueous and organic phases, respectively. The studied extraction system can be described 1) by the following homogeneous (in the aqueous phase) reactions and phase equlibria: VZ'(w) + iH+(w) = Hi viZ(w)," Ln3+(w) + VZ(w) =LnV a-z(w); H20(w) = H+(w) + OH(w); Ln3+(w)+ 3NO3(w)+ jS (o) = [Ln(NO3)3jS](o); H+(w)+ NO3(w)+ pS(o)= [HNO~pS](o); NH4+(w) = NH3(w) + H+(w), where ~hi, ~Mk, Kw, KMex, Khex, KNH4 are the values of concentration constants of homogeneous and phase equlibria and V z-the complexing ion.2) By equations of the mass balance:

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