NDLI: Kinetics Study of Solvent and Solid-Phase Extraction of Rare Earth Metals with Di-2-Ethylhexylphosphoric Acid

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Kinetics Study of Solvent and Solid-Phase Extraction of Rare Earth Metals with Di-2-Ethylhexylphosphoric Acid

Content Provider	MDPI
Author	Cheremisina, Olga Sergeev, Vasiliy Ponomareva, Maria Ilina, Alexandra Fedorov, Alexander
Copyright Year	2020
Description	The kinetic features of solvent and solid-phase extraction of yttrium and iron (III) from simulated and industrial phosphoric acid solutions are revealed. Di-2-ethylhexylphosphoric acid (D2EHPA) was used as a liquid extractant, and D2EHPA-containing Levextrel resin—a co-polymerization product of styrene and divinylbenzene in the presence of D2EHPA—was used as a solid-phase extraction agent. Significant dependence of yttrium extraction rate constant on the stirring rate was revealed using the formal first-order kinetic equation. The data obtained characterizes a diffusion-limited process with an activation energy of 16.2 ± 1.3 kJ/mol. Temperature increase during the iron (III) extraction process leads to a changeover of a rate-limiting stage from kinetic to diffusion, accompanied by drop of activation energy from 40.0 ± 1.4 to 11.4 ± 1.2 kJ/mol. Effective separation of elements at the extraction stage is possible at temperatures of 283–300 K under non-equilibrium conditions of the ferric ions transport from aqueous to organic phase. This condition ensures a high yttrium–iron separation coefficient of 23.2 in 1.5–2 min. Extraction kinetics by Levextrel resin are described by Fick’s second law equation, which establishes the laws of diffusion in the solid grain of the organic phase with an activation energy of 18.5 ± 2.0 kJ/mol.
Starting Page	687
e-ISSN	20754701
DOI	10.3390/met10050687
Journal	Metals
Issue Number	5
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-05-23
Access Restriction	Open
Subject Keyword	Metals Environmental Engineering Extraction Solid Extractant Solvent-impregnated Resin Di-2-ethylhexylphosphoric Acid Phosphoric Acid Ferric Iron Yttrium Sorption Kinetics
Content Type	Text
Resource Type	Article

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