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Abstract

Extraction of Nd(III) by Hydrophobic Deep Eutectic Solvent BTMPPA/Phenol from Nitrate Solution †

by
Inna V. Zinov’eva
*,
Yulia A. Zakhodyaeva
and
Andrey A. Voshkin
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow 119071, Russia
*
Author to whom correspondence should be addressed.
†
Presented at the 3rd International Electronic Conference on Processes—Green and Sustainable Process Engineering and Process Systems Engineering (ECP 2024), 29–31 May 2024; Available online: https://sciforum.net/event/ECP2024.
Proceedings 2024, 105(1), 90; https://doi.org/10.3390/proceedings2024105090
Published: 28 May 2024
(This article belongs to the Proceedings of The 3rd International Electronic Conference on Processes—Green and Sustainable Process Engineering and Process Systems Engineering)
Versions Notes

Abstract

:
Today, rare earth elements (REEs) are used in the production of high-tech products, including permanent magnet lasers, computer equipment, etc. The recycling of NdFeB magnets is a promising REE resource, as the amount of waste-spent magnets increases with increasing demand. Solvent extraction is an effective method in the hydrometallurgical processing of NdFeB magnets. Recently, researchers have been using alternative solvents in the development of new REE extraction processes. Hydrophobic deep eutectic solvents are increasingly proposed as promising extractants for a wide range of organic and inorganic substances. The aim of the present work is to study the extraction of Nd(III) with a hydrophobic deep eutectic solvent based on di(2,4,4-trimethylpentyl)phosphinic acid (BTMPPA) and phenol. The HDES was prepared from a hydrogen bond acceptor (BTMPPA) and donor (phenol) in a molar ratio of 1:3. All extraction experiments were carried out at a temperature of 25 °C and an atmospheric pressure of ~100 kPa in graduated centrifuge tubes with a thermostatically controlled shaker. The present study aims to determine the distribution coefficients of Nd(III) in the extraction system using HDES BTMPPA/phenol. It was found that the distribution coefficient of Nd(III) is 0.43 with a ratio of aqueous phase and HES phase equal to 1:1. Changing the volume ratio of the phases will allow the metal to be concentrated in the HDES phase. In addition, the influence of the acidity of the aqueous phase was found in the pH range from 0 to 7. The results showed the possibility of increasing the distribution coefficient of Nd(III) up to 0.97 with increasing pH. Thus, the promising use of HDES BTMPPA/phenol in the extraction of neodymium from nitrate solution was shown. The obtained data can be used in the development of new effective hydrometallurgical processes of REE extraction from a leaching solution of spent magnetic materials.

Supplementary Materials

The presentation material of this work is available online at https://www.mdpi.com/article/10.3390/proceedings2024105090/s1.

Author Contributions

Conceptualization, I.V.Z. and Y.A.Z.; methodology, Y.A.Z.; software, I.V.Z.; validation, I.V.Z., Y.A.Z. and A.A.V.; formal analysis, A.A.V.; investigation, I.V.Z.; resources, A.A.V.; data curation, Y.A.Z.; writing—original draft preparation, I.V.Z.; writing—review and editing, A.A.V.; visualization, I.V.Z.; supervision, Y.A.Z.; project administration, Y.A.Z.; funding acquisition, A.A.V. All authors have read and agreed to the published version of the manuscript.

Funding

The study was supported by a grant from the Russian Science Foundation (project No. 24-29-00667), https://rscf.ru/en/project/24-29-00667/.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Informed consent was obtained from all subjects involved in the study.

Data Availability Statement

The data presented in this study are available on request from the corresponding author.

Conflicts of Interest

The authors declare no conflict of interest.
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Share and Cite

MDPI and ACS Style

Zinov’eva, I.V.; Zakhodyaeva, Y.A.; Voshkin, A.A. Extraction of Nd(III) by Hydrophobic Deep Eutectic Solvent BTMPPA/Phenol from Nitrate Solution. Proceedings 2024, 105, 90. https://doi.org/10.3390/proceedings2024105090

AMA Style

Zinov’eva IV, Zakhodyaeva YA, Voshkin AA. Extraction of Nd(III) by Hydrophobic Deep Eutectic Solvent BTMPPA/Phenol from Nitrate Solution. Proceedings. 2024; 105(1):90. https://doi.org/10.3390/proceedings2024105090

Chicago/Turabian Style

Zinov’eva, Inna V., Yulia A. Zakhodyaeva, and Andrey A. Voshkin. 2024. "Extraction of Nd(III) by Hydrophobic Deep Eutectic Solvent BTMPPA/Phenol from Nitrate Solution" Proceedings 105, no. 1: 90. https://doi.org/10.3390/proceedings2024105090

APA Style

Zinov’eva, I. V., Zakhodyaeva, Y. A., & Voshkin, A. A. (2024). Extraction of Nd(III) by Hydrophobic Deep Eutectic Solvent BTMPPA/Phenol from Nitrate Solution. Proceedings, 105(1), 90. https://doi.org/10.3390/proceedings2024105090

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