Levextrel Resins

The only major impediment to the development of SIRs on an industrial hydrometallurgical scale is the problem of leakage of the reagent from the resin phase into the aqueous feed solution, a problem that is more severe in the first type of SIRs than in the Levextrel resins. If this problem can be solved, a bright future is predicted for this concept in resin technology. 

LEVEXTREL resin in the HDEHP form (Bayer, Leverkusen, FRG) was used as stationary phase and two columns were utilized to remove Pu and Am-Cm-RE from the respective acidic and low-acidity feed solutions. More than 99% of Pu was adsorbed and eluted from the first chromatographic column by oxalic acid, whereas less satisfactory results were obtained for the Am, Cm/RE separation tests, fractions of Am and Cm as high as a few percent being carried over into the RE fraction. 

Extraction ofZn(II), Cu(II), and Cd(II) with Impregnated Resins and Levextrel Resins Containing Acidic Organophosphorus Compounds (DEHPA, DTMPPA)... 

Cortina et al [31,32,34,35] studied the distribution of divalent metal ions [Zn(II), Cu(II) and Cd(II)] with impregnated resins and Levextrel resins containing acidic organophosphorous compounds (HL). Metal distribution ratio of these metal ions are shown in Figures 12—15. 

Figure 14 Metal distribution values of Zn, Cu, or for Levextrel resins containing DTMPPA (Lewatit TP807 84). (From Ref. 35.)...

Keywords Extraction Chromatography, Levextrel Resins, Ni-Co Separation, High Purity... 

In the study about purifying cobalt solution with the extraction chromatography, Yo-shizuka et. al [14] used levextrel resin with Cyanex272 to separate Co( II) from Ni( II) in nitrate and sulfate medium, meanwhile, the behaviors of various metal ions in the resin were studied. Zhou... 

Chunshan, Wangyan et. al [15, 16] used P204,the transformed levextrel resin to separate Co from Cu, Sn, Mn, Zn, Fe and other metal ions. 

In this paper, the process which purifies the cobalt salt solution with the PC88A levextrel resin and prepares high-purity cobalt through electrolysis is studied. 

Sorbents containing immobilized extractants can be classified into two basic types (1) solvent-impregnated resins prepared by adsorption of an liquid extractant on polymer supports and (2) resins with liquid extractant encarcerated within polymer matrix during polymerization (TVEX and Levextrel resins) [6,7]. 

To conclude, based on the uniqueness of ionic liquids, appropriate ionic liquid immobilization strategies can be used to separate REs. The levextrel resin, supported liquid membranes, and sol-gel materials containing ILs and extractants have high stability, capacity, and selectivity for the RE separation, demmistrating the unique properties of ILs. It will be more useful in RE concentration from very dilute RE solutions and the purification of high-purity REs. 

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