Separation of heavy rare earth elements with extraction resin containing 1-hexyl-4-ethyloctyl isopropylphosphonic acid

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

“…The results clearly demonstrate that the decrease in separation factors follow their increase in ionic radii except for Y. It was falling in between Ho and Er, which is in good agreement with the results reported by Li et al [14,15].…”

“…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.…”

“…On the other hand, ion exchange is an ideal method for removing trace levels of metal ions from aqueous solutions. Li et al [14,15] reported the extraction of heavy rare-earths using extraction resins containing Cyanex 272 and extraction resin containing 1-hexyl-4-ethyloctyl isopropylphosphonic acid (HEOPPA) from hydrochloric acid solutions. They reported that adsorption of rare-earths on the resin as a function of pH follows the order as Lu(III) > Yb(III) > Tm(III) > Er(III) > Y(III) > Ho(III).…”

Adsorption of heavy rare earth(III) with extraction resin containing bis(2,4,4-trimethylpentyl) monothiophosphinic acid

“…Wang et al [17,18] studied the separation of heavy rare earths (III) with extraction resin containing Cyanex272 and HEOPPA, respectively and obtained highly pure rare earth oxides in high yields. Luo [19] studied the adsorption of divalent metal ions with extraction resin containing Cyanex302 from sulfuric solutions and compared the results of different metal ions.…”

Use of extraction chromatography in the recycling of critical metals from thin film leach solutions

“…Suitable extractants, capable of extracting a range of metal ions, are chemically stable and have low aqueous solubility. Traditionally, organophosphorus extractants have been used extensively in extraction chromatography to separate rare earth elements [15][16][17] and the use of diglycolamides, particularly the neutral diglycolamide N,N,N′,N′-tetra(noctyl)diglycolamide (TODGA) to extract and separate actinide and lanthanide elements, has been reported, including their use in extraction chromatography [18][19][20]. melting points below 100 o C [21] that have received significant considerable attention as alternatives to conventional solvents.…”