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| Separation of lithium and magnesium from salt lake brine by TBP-D2EHPA synergistic extraction system |
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Received:May 10, 2022
Revised:May 10, 2022
Accepted:May 16, 2022
Published Online:July 04, 2022
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| DOI： |
| KeyWord:salt lake brine; lithium; D2EHPA; synergistic extraction; lithium and magnesium separation |
| Author | Institution |
| Wang De-Qing |
Beijing General Research Institute of Mining and Metallurgy,Beijing |
| Wang Hai-bei |
Beijing General Research Institute of Mining and Metallurgy,Beijing |
| Xie Keng |
BGRIMM Technology Group,Beijing |
| Wang Zi-hao |
Beijing General Research Institute of Mining and Metallurgy,Beijing |
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| Abstract: |
| Aiming at the problems of high acidity stripping and consumption of a large amount of reagents for organic regeneration in the process of separating lithium and magnesium from salt lake brine with high magnesium-to-lithium ratio by tributyl phosphate (TBP)-FeCl3 extraction system, a synergistic extraction system with addition of bis(2-ethylhexyl) phosphate (D2EHPA) was screened out. The effects of organic phase composition, Fe/Li molar ratio, extraction ratio and other factors on the extraction and separation of lithium and magnesium from salt lake brine were systematically investigated. Under the optimal extraction conditions of organic phase composition of 40%TBP-20% D2EHPA-40% 260# solvent oil, Fe/Li molar ratio of 1.5, and O/A=2, the single-stage Li+ extraction rate reached 78.56% and the lithium-magnesium separation coefficient reached 46.26. Using water as the washing and stripping agent, the washing ratio of O/A=60 and the stripping ratio of O/A=20 were preferred. A good lithium-magnesium separation effect was achieved, providing a basis for subsequent pilot experiments and industrial design. |
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