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| Study on Lithium Extraction from Brine by Superconducting Magnetic Separation and Adsorption |
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Received:September 29, 2019
Revised:October 06, 2019
Accepted:October 07, 2019
Published Online:February 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.03.007 |
| KeyWord:superconducting magnetic separation; adsorption; desorption; brine; lithium extraction |
| Author | Institution |
| ZHANG Kai |
东华理工大学 |
| LI Yi-ran |
江西省南昌市青山湖区广兰大道418号东华理工大学 |
| MA Jun-yao |
江苏旌凯中科超导高技术有限公司 |
| HOU Kai |
江西省南昌市青山湖区广兰大道418号东华理工大学 |
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| Abstract: |
| Old brine with Li+ 0.15 g/L and Mg2+ 119.5 g/L after potassium extraction from a salt lake was researched. Saturated adsorption capacity of magnetic aluminum-based adsorbent is 4.3 mg/g. Separation of adsorbent from brine was carried out by superconducting magnetic separator to realize synchronization salt leaching and desorption. Final product is lithium-bearing stripping solution. The results show that retention rate of adsorbent is 99% above under the conditions including superconducting magnetic separator adopting steel mesh medium, background magnetic field strength of 2 400 kA/m, adsorbent concentration of 10%, and feeding speed of 10 cm/s. Recovery rate of lithium from brine in whole process is 80% above under the conditions including salt leaching with 500 mL fresh water, desorption with 1.5 L fresh water, and concentration of Li+ and Mg2+ in desorption solution of 0.28 g/L and 0.57 g/L respectively. Lost of adsorbent is 8.9% after 100 adsorption desorption cycles in magnetic separation system. This process has certain industrial value in practice. |
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