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| Study on Properties of Lithium Solvent Extraction System for Salt Lake Brine |
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Received:January 16, 2018
Revised:January 25, 2018
Accepted:January 26, 2018
Published Online:May 17, 2018
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| DOI：doi：10.3969/j.issn.1007-7545.2018.06.008 |
| KeyWord:salt lake brine; lithium extraction; TBP; MIBK; co-extraction; ion-pair extraction |
| Author | Institution |
| Xue yufei |
北京矿冶研究总院 |
| Jiang kaixi |
北京矿冶研究总院 |
| Wang haibei |
北京矿冶研究总院 |
| Xie keng |
北京矿冶研究总院 |
| Zhou qifan |
北京矿冶研究总院 |
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| Abstract: |
| Lithium was extracted from salt lake brine with mixed solvent system consisting of extraction agent of TBP, synergistic solvent extraction agent of MIBK, co-extraction agent of FeCl3, and diluent of sulfonated kerosene. The optimum solvent extraction conditions include 40%TBP 20%MIBK 40% sulfonated kerosene, O/A=2.5, n(Fe3 /Li )=2.5, and original H concentration of 0.04 mol/L. The results show that single-stage lithium solvent extraction rate is 91.21%, and magnesium solvent extraction rate is 2.10% with separation coefficient ( ) of 483.05. New extracting complex formation is demonstrated by chemical analysis and IR spectra, and the formation is LiFeCl4?4TBP?MIBK inferred by slope method. Extraction processes are discussed based on ion-pair extraction theory. This mixed system is demonstrated to extract lithium from chloride salt lake with high Mg/Li ratio and low acidity. |
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