التفاصيل البيبلوغرافية
| العنوان: |
Amine Sorbents for Selective Recovery of Heavy Rare-Earth Elements (Dysprosium, Ytterbium) from Aqueous Solution. |
| المؤلفون: |
Qiuming Wang, Kail, Brian W., Wilfong, Walter C., Fan Shi, Tarka, Thomas J., Gray, McMahan L. |
| المصدر: |
ChemPlusChem; Jan2020, Vol. 85 Issue 1, p130-136, 7p |
| مصطلحات موضوعية: |
HEAVY elements, ACID mine drainage, AQUEOUS solutions, SORBENTS, DYSPROSIUM, YTTERBIUM, YTTERBIUM compounds |
| الشركة/الكيان: |
UNITED States. Dept. of Energy |
| مستخلص: |
The supply shortages of rare-earth elements (REEs) necessitate low-cost and efficient processes for the recovery of valuable REE commodities. A covalently anchored polyethylenimineepoxysilane-silica sorbent was prepared by simple wet impregnation and engineered to afford selective separation of REEs into heavy and light element groups. Remarkably, the sorbent allowed the cyclic recovery of >80% of ppb-level REEs and around 0% of the ppm-level Na, Mg, Ca from acid mine drainage solution, thus highlighting the applicability of the sorbent for concentrating REEs from practical waste streams. Moreover, the sorbent is promising for pre-concentration of 7.6 wt% REEs, exceeding the U.S. Department of Energy REEs pre-concentration objective. Notably, the use of an immobilized amine sorbent for the selective separation of the heavier REEs by an adsorption-elution process allowed only the heavier species (>99% Dy+Yb) to be concentrated and separated. This represents a practical and highly efficient sorbent adsorptiondesorption procedure that both concentrates and separates high-purity REE from low-concentration REE sources. [ABSTRACT FROM AUTHOR] |
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