Abstract
Rare earth elements (REEs) are commonly categorized into light (LREEs), medium (MREEs), and heavy (HREEs) groups. Separation between LREEs and MREEs or MREEs is relatively straightforward. However, isolating LREEs themselves is particularly challenging because of their similar ionic radii and identical charges. Traditional separation processes are hindered by drawbacks including low recovery rates for dilute REEs, poor selectivity, complex protocols, and environmental pollution. Consequently, developing a cleaner and more efficient method for LREEs separation is imperative. In this study, we employed a single-module hollow fiber supported liquid membrane (HFSLM) system with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (P507) as an extractant to concurrently extract and strip La3+ and Nd3+ from the mixed LREEs containing solutions. We also investigated the impact of flow rate, stripping solution acidity, feed solution pH, P507 concentration, Nd3+ concentration of feed solution, and the volume ratio between the feed and stripping solutions influence the extraction and stripping of LREEs, as well as the molar fractions of La3+ and Nd3+ in the solutions. Under optimal condition, the molar fraction of La3+ was 99.0% in the feed solution, whereas the molar fraction of Nd3+ reached 91.6% in the stripping solution. Furthermore, the experimental results demonstrated a consistent preference of P507-HFSLM system for extracting Nd3+ over La3+, and the underlying mechanism was thoroughly investigated. In summary, this study offers comprehensive insights and technical approaches for selective separation and purification of LREEs.
Original language | English |
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Article number | 126759 |
Journal | Separation and Purification Technology |
Volume | 340 |
Early online date | 14 Feb 2024 |
DOIs | |
Publication status | Published - 15 Jul 2024 |
Funding
All authors thank for financial support from National Key Research and Development Program of China (Grant No.: 2022YFB3504303 ), Natural Science Foundation of China (Grant No.: 22378389 ), Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths ( E03MYB0302 ), and Self-deployed Projects of Ganjiang Innovation Academy, Chinese Academy of Sciences ( E055A002 ). D.H.S acknowledges the support of D.H.S. acknowledges the support of Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy ( MOTIE ) of the Republic of Korea (No. 20224000000100 ).
Funders | Funder number |
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Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths | E03MYB0302 |
Ganjiang Innovation Academy, Chinese Academy of Sciences | |
National Natural Science Foundation of China | 22378389 |
Chinese Academy of Sciences | E055A002 |
Ministry of Trade, Industry and Energy | 20224000000100 |
Korea Institute of Energy Technology Evaluation and Planning | |
National Key Research and Development Program of China | 2022YFB3504303 |
Keywords
- Fractionation
- Hollow fiber supported liquid membrane
- Light rare earth elements
- Non-saponification
- Simultaneous extraction and stripping
ASJC Scopus subject areas
- Analytical Chemistry
- Filtration and Separation