SYNERGIC EXTRACTION OF Pr(III) FROM NITRATE SOLUTIONS BY MIXTURES OF TOMAN-TBP
Synergic solvent extraction are widely used for rare earth elements separation. In present paper the extraction of Pr(III) from nitrate solutions by mixtures of methyl-tri-n-octylammonium nitrate and tri-n-butylphosphate, using method of isomolar series is investigated. The composition of extracted nitrate Praseodimium(III) complexes with extractants up to position of maximums on the synergic curve are established. The general extracted complex is [CH3(C8H17)3N]n[Pr(NO3)3+n.(1-2)(C4H9O)3PO], n=2-3and [CH3(C8H17)3N]3[Pr(NO3)6].R4NNO3.