Solid‐Liquid Extraction of Terbium from Phosphoric Acid Medium using Bifunctional Phosphinic Acid Resin, Tulsion CH‐96

Solid–liquid extraction of heavy rare-earths from phosphoric acid solutions using Tulsion CH-96 and T-PAR resins

“…The percent extraction decreases with increasing ionic radii. The results are in good agreement with the reported literature [8,14,15,28]. The separation factors (Table 1) of Lu for Tb and Dy are 16.7 and 10.9, respectively at 0.5 M acid concentration.…”

“…3). It was found that the percent extraction of metal decreases with increase in acid concentration, confirming the metal transfer to the resin phase follows ion exchange type mechanism [28]. Further, the results suggest large differences in percentage extraction of some metals over the others at certain acidities, thereby showing separation possibilities.…”

“…This bifunctional phosphinic acid resin was proved as a potential candidate for the recovery of uranium and actinides from different acid media [25][26][27]. In our previous work we reported the extraction behavior, mechanism of metal transfer and separation factors of terbium from other rare-earths using this bifunctional phosphinic acid resin, Tulsion CH-96 from phosphoric acid medium [28]. Recently phosphoric acid resin, RGP, with a large acid capacity was prepared by the addition of phosphoric acid to epoxy groups of macroreticular poly(glycidyl methacrylate-co-divinylbenzene).…”

Solid–liquid extraction of terbium from phosphoric acid solutions using solvent‐impregnated resin containing TOPS 99

“…The observed difference is due to their varying ionic radii with the percentage extraction of rare earths decreasing with increasing ionic radii except yttrium which falls between holmium and erbium. The results are in good agreement with the reported literature 13, 19, 20, 29, 30. The separation of rare earths from each other has received considerable attention and a useful indication as to whether this can be achieved is given by the separation factors.…”

“…The literature search on HREs indicates that most of the studies deal with chloride and nitrate media. In previous studies we reported the solid–liquid extraction behaviour of terbium and heavy rare earths (HREs) from phosphoric acid using Tulsion CH‐96 and T‐PAR resins 29, 30. In this paper, we report detailed studies on the solid–liquid extraction of terbium from phosphoric acid solutions using a solvent‐impregnated resin containing TOPS 99 and its extraction behavior with the common rare earth elements such as yttrium, holmium, erbium, dysprosium, ytterbium and lutetium.…”