Recovery of lithium from geothermal water by solvent extraction technique
Abstract
The solvent extraction of alkali and alkaline earth metals (Li, Na, K, Mg, Ca) was studied using organophosphorus compounds like di-2-ethylhexylphosphoric acid(D2EHPA) or 2-ethylhexyl-phosphonic acid 2-ethylhexyl ester (MEHPA) as extractants. Extraction equilibrium constants and composition of each metal complex in organic phase were determined. Synergistic effect of tri-n-butylphosphate (TBP) was observed for lithium and sodium. This effect was presumed to be due to the replacement of solvated extractant(D2EHPA or MEHPA) by TBP. Finally, lithium was recovered by the above solvent extraction system from hot spring water in Oita, Japan.
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The extraction percentages for the D2EHPA + TBP and MEHPA + TBP Hazama water samples were 88.3% and 11.7%, respectively.
“Similarly, the extraction percentages for the D2EHPA + TBP and MEHPA + TBP Hazama water samples were 88.3% and 11.7%, respectively.”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
Li+ extraction percentages for the Yamaga water samples with D2EHPA + TBP and MEHPA + TBP were 52.6% and 47.6%, respectively.
“Li + extraction percentages for the Yamaga water samples with additive, or D2EHPA + TBP and MEHPA + TBP, were 52.6% and 47.6%, respectively.”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
D2EHPA + TBP demonstrated the highest extraction performance overall.
“D2EHPA + TBP demonstrated the highest extraction performance overall.”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
The Yamaga water Na+/Li+ and Mg2+/Li+ ratios are ~301 and ~4, and the Hazama water Na+/Li+ and Mg2+/Li+ ratios are ~184 and ~11, respectively.
“The Yamaga water Na + /Li + and Mg 2+ /Li + ratios are ~301 and ~4. The Hazama water Na + /Li + and Mg 2+ /Li + ratios are ~184 and ~11, respectively.”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
The TBP additive increased Li+ extraction in all cases.
“However, the TBP additive increased Li + extraction in all cases.”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
Ca2+ and Mg2+ had a greater affinity for the acidic extractants and demonstrated extraction percentages greater than 91% from the MEHPA and MEHPA + TBP Hazama water samples.
“However, Ca 2+ and Mg 2+ had a greater af fi nity for the acidic extractants and demonstrated extraction percentages greater than 91% (excluding Ca 2+ ) from the MEHPA and MEHPA + TBP Hazama water samples.”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
The percent Li+ extraction from the Hazama water samples for D2EHPA and MEHPA were 52% and 5.2%, respectively.
“The percent Li + extraction from the Hazama water samples for D2EHPa and MEHPA were 52% and 5.2%, respectively.”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
The percent of Li+ extracted from the Yamaga water samples for D2EHPA and MEHPA were 42.5% and 42.2%, respectively.
“The percent of Li + extracted from the Yamaga water samples for D2EHPA and MEHPA were 42.5% and 42.2%, respectively.”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
D2EHPA and MEHPA demonstrated high selectivity of Li+ ions over Na+ and K+.
“D2EHPA and MEHPA demonstrated high selectivity of Li + ions over Na + and K + .”
From A review of technologies for direct lithium extraction from low Li+ concentration aqueous solutions (2022) · cites this paper as Hano et al. (1992)
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- Authors
- HANO, T., MATSUMOTO, M., OHTAKE, T., EGASHIR, N., & HORI, F.
- Affiliations
- Oita University (JP)
- ORCID
- MATSUMOTO, M.
- Venue
- Solvent Extraction and Ion Exchange
- Publisher
- Informa UK Limited
- Published
- 1992-04
- Volume
- 10
- Issue
- 2
- Pages
- 195-206
- ISSN
- 0736-6299 (ISSN-L)
- 1532-2262
- OpenAlex
- W2082383870
- Cited by
- 94
- References
- 10
- Citations by year
- 2026: 6 · 2025: 7 · 2024: 13 · 2023: 10 · 2022: 7 · 2021: 8 · 2020: 11 · 2019: 6 · 2018: 8 · 2017: 2 · 2016: 3 · 2015: 2 · 2014: 1 · 2013: 1 · 2012: 2
- FWCI
- 2.17
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Solvent Extraction and Ion Exchange (publishedVersion)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Extraction and Separation Processes
- Physical Sciences › Chemical Engineering › Filtration and Separation › Chemical and Physical Properties in Aqueous Solutions
- Physical Sciences › Chemistry › Inorganic Chemistry › Radioactive element chemistry and processing
- Keywords
- lithium recovery, geothermal water, hot spring water, solvent extraction, D2EHPA, tributyl phosphate, synergistic effect, extraction constants, alkali and alkaline earth metals
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