Silica-based solvent impregnated adsorbents for separation of rare earth metals

Nishihama, Syouhei; Harano, Taihei; Yoshizuka, Kazuharu

doi:10.1080/01496395.2017.1310895

Cited by 8 publications

(1 citation statement)

References 15 publications

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“…Most of these adsorbents are designed to separate only REEs or REEs from other impurities such as Fe or Al. Focusing on the individual separation of REEs, there are several reports on the separation of HREE and LREE, such as the separation of Dy and Nd, and separation is possible [ 12 , 13 , 14 , 15 ]. However, there are no reports of effective adsorbents for adjacent REEs, such as Nd and Pr, and classical industrial methods must be used to separate individual REEs by adsorption.…”

Section: Introductionmentioning

confidence: 99%

Separation of Adjacent Light Rare Earth Elements Using Silica Gel Modified with Diglycolamic Acid

Ogata,

Narita

2024

Materials

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The separation of adjacent rare earth elements (REEs) is a challenging issue due to their chemical similarity. We have investigated the separation of adjacent REEs using four types of adsorbents consisting of silica gel modified with diglycolamic acid with different functional groups at the amide position. For all the adsorbents, the adsorption ratio of REEs increased with the increase in atomic number from La to Sm and then became constant for heavy REEs. Among them, EDASiDGA, an adsorbent containing secondary and tertiary amides, showed a high separation factor for Nd/Pr of 2.8. The EDASiDGA-packed column was tested for individual recovery of Pr, Nd, and Sm. After the adsorption of these REEs from 0.10 M HCl, desorption tests were performed with 0.32 and 1.0 M HCl. As a result, Pr and Nd were eluted separately with 0.32 M HCl, and Sm was recovered with 1.0 M HCl. Since the EDASiDGA-packed column showed excellent separation of Pr/Nd/Sm without any chelating agent, it is promising for practical use.

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