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| Study on lithium extraction process by adsorption-membrane coupling method in high Mg2+/Li+ ratio salt lake |
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Received:February 28, 2024
Revised:February 29, 2024
Accepted:March 07, 2024
Published Online:July 09, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.08.007 |
| KeyWord:lithium; high Mg2+/Li+ ratio salt lake brines; adsorption-membrane coupling method; magnesium-lithium separation |
| Author | Institution |
| HAN Wenfu |
北京矿冶研究总院 |
| WANG Haibei |
北京矿冶研究总院 |
| GUO Zong |
矿冶科技集团有限公司 |
| ZHENG Chaozhen |
矿冶科技集团有限公司 |
| NIU Li |
矿冶科技集团有限公司 |
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| Abstract: |
| China""s lithium resources mainly exist in salt lake with high magnesium-lithium ratio, which is difficult to extract lithium efficiently by a single separation method. The coupling of multiple lithium extraction technologies from salt lakes is the future development trend of lithium extraction from salt lakes. The salt lake brine was treated by adsorption-membrane coupling method, and the highly selective lithium adsorption was realized under optimized conditions, and the Mg2+/Li+ ratio of the brine was reduced from 105.2 to 1.49 after dynamic desorption. The effect of different conditions on the separation and purification of lithium by nanofiltration membrane separation was investigated. Under the conditions of dilution ratio of 1.0, temperature of 20 ℃, operating pressure of 0.4 MPa, pH value of 4.66, and raw material/liquid ratio of the produced water of 0.54, the lithium retention rate of nanofiltration membrane is 2.63%, the separation factor is 27.3, and the permeation flux is 7.125 L/(m2?h). The final Mg2+/Li+ ratio of the produced water is reduced from the initial brine of 105.2 to 0.05, which the green and efficient extraction of lithium resources from salt lake brines with high Mg2+/Li+ ratio is realized. |
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