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| Study on Property and Mechanism of Mixed Lithium Extraction System from Brine |
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Received:April 10, 2020
Revised:April 14, 2020
Accepted:April 14, 2020
Published Online:June 20, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.07.007 |
| KeyWord:brine; lithium; extraction; co-extraction; ionic association |
| Author | Institution |
| XUE Yufei |
矿冶科技集团有限公司 |
| ZOU Xiaoping |
矿冶科技集团有限公司 |
| JIANG Yingping |
矿冶科技集团有限公司 |
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| Abstract: |
| In order to find out properties and mechanism of mixed lithium extraction system from brine, influences of O/A and n(Fe3+/Li+) (mole ratio) on extraction system of 40%TBP-20%BA-40% 200# sulfonated kerosene were discussed. The single-stage extraction rate of lithium and magnesium is 87.34% and 3.89% respectively under the optimum conditions of O/A=1.5 and n(Fe3+/Li+)=1.5. These parameters were beneficial to subsequent multistage extraction test and further industrial design. Co-extraction phenomenon of Fe3+, Cl-, and Li+ in LiFeCl4 formed delocalized π-bond was analyzed by means of chlorine bridge theory. Combination between Li+ coordination water molecule and P=O, C=O polar functional group in TBP and BA was speculated as hydrogen bonding association by 1H-NMH spectra of organic phases before/after extraction. Modified electrostatic model was proposed according to ion-pair extraction theory. Competitive relationship among Li+, Mg2+ and other undesired impurities was discussed. |
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