TY - JOUR
T1 - Selective Separation of Rare Earth Metals by Solvent Extraction in the Presence of New Hydrophilic Chelating Polymers Functionalized with Ethylenediaminetetraacetic Acid. II. Separation Properties by Solvent Extraction
AU - Matsuyama, Hideto
AU - Miyamoto, Yoshikazu
AU - Teramoto, Masaaki
AU - Goto, Masahiro
AU - Nakashio, Fumiyuki
PY - 1996
Y1 - 1996
N2 - The selective separation of rare earth metals by solvent extraction including chelating polymers in the aqueous phase was investigated. The chelating polymers were synthesized in this laboratory by introducing ethylenediaminetetraacetic acid (EDTA) onto water-soluble polyally lamine. The highest selectivity obtained for the Y/Er separation system was 14.7, which was much higher than that in conventional solvent extraction (about 1.4) and also higher than that in extraction including EDTA (about 5.0). This means that the number of extraction stages required can be considerably reduced by the addition of chelating polymers. The effects of several experimental conditions such as pH, extractant concentrations, chelating polymer concentrations, and initial total rare earth metal concentrations on the separation factors and the distribution ratios for the Y/Er system were studied in detail. Furthermore, this extraction method was applied to other separation systems (Y/Dy, Y/Ho, Y/Tm). A remarkably high separation factor (12.6) was obtained for the Y/Tm system and the Y/Er system, although the separation factors were comparable to those in the presence of EDTA in the Y/Dy and Y/Ho systems.
AB - The selective separation of rare earth metals by solvent extraction including chelating polymers in the aqueous phase was investigated. The chelating polymers were synthesized in this laboratory by introducing ethylenediaminetetraacetic acid (EDTA) onto water-soluble polyally lamine. The highest selectivity obtained for the Y/Er separation system was 14.7, which was much higher than that in conventional solvent extraction (about 1.4) and also higher than that in extraction including EDTA (about 5.0). This means that the number of extraction stages required can be considerably reduced by the addition of chelating polymers. The effects of several experimental conditions such as pH, extractant concentrations, chelating polymer concentrations, and initial total rare earth metal concentrations on the separation factors and the distribution ratios for the Y/Er system were studied in detail. Furthermore, this extraction method was applied to other separation systems (Y/Dy, Y/Ho, Y/Tm). A remarkably high separation factor (12.6) was obtained for the Y/Tm system and the Y/Er system, although the separation factors were comparable to those in the presence of EDTA in the Y/Dy and Y/Ho systems.
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U2 - 10.1080/01496399608001325
DO - 10.1080/01496399608001325
M3 - Article
AN - SCOPUS:0030088306
SN - 0149-6395
VL - 31
SP - 799
EP - 810
JO - Separation Science and Technology
JF - Separation Science and Technology
IS - 6
ER -