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| Adsorption characteristics and mechanism of titanium-based ion sieves for lithium/aluminum separation in alkaline leachate of clay-type lithium ore |
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Received:December 04, 2024
Revised:March 17, 2025
Accepted:March 28, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2025.06.019 |
| KeyWord:lithium;titanium-based ion sieve;clay-type lithium ore;lithium-aluminum separation;adsorption kinetics;ion exchange |
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| 1.Beijing General Research Institute of Mining and Metallurgy, Beijing 102628, China;2.BGRIMM Technology Group, Beijing 100160, China |
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| Abstract: |
| The alkaline leachate system of clay-type lithium ore faces the technical challenge of efficient lithium-aluminum separation, necessitating the development of high-performance separation materials. To address this system, this study successfully synthesized a novel layered titanium-based ion sieve using a solid-state sintering method and systematically investigated its selective adsorption performance and separation mechanism for lithium in alkaline leachate. The results show that the synthesized ion sieve primarily consists of Li2TiO3, featuring a rich porous surface structure with a specific surface area of 4.48 m2·g?1 and a saturated adsorption capacity of 18.89 mg·g?1. Under optimized conditions (liquid-to-solid ratio of 5∶1, temperature of 45 ℃, adsorption time of 2 h), the lithium adsorption rate reached 98.7%, with a lithium-aluminum separation coefficient as high as 382.5, demonstrating excellent selectivity. Increasing the temperature effectively inhibited aluminum hydrolysis and surface attachment, significantly reducing aluminum loss. Kinetic and thermodynamic studies revealed that the adsorption process conforms to the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating a monolayer ion-exchange process controlled by chemisorption. This study provides new materials and a theoretical foundation for the efficient separation of lithium and aluminum in the alkaline leachate of clay-type lithium ore, holding significant importance for promoting the clean extraction and comprehensive utilization of lithium resources. |
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