| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Study on Adsorption and Removal of Potassium Ions from Lithium Chloride Solution |
| LI Zhilu1,2, WANG Min1,2,*
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1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810018, China
2 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810018, China |
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Abstract The purity of lithium products affects its economic value and practical application, so it is of great significance to apply the prepared adsorbent to the adsorption and removal of potassium ions in lithium chloride high concentration. This work used hydrothermal method and spray drying method to prepare zeolite powder adsorbent and microparticle adsorbent with potassium adsorption ability, respectively, and then investigated their static adsorption and dynamic adsorption performance in lithium solution containing potassium impurities. Meanwhile, in order to better explore the adsorption process, the adsorption equations were used to describe and analyze the kinetic process, and the dissolution loss of the adsorbent during the adsorption and desorption cycle was investigated. The results showed that the prepared zeolite powders and particles contained good static adsorption performance. The static adsorption capacity of the particle adsorbent can reach 32 mg/g, and the adsorption saturation capacity according to the dynamic adsorption process was 21 mg/g and the adsorbent contributed good selectivity for K+ in the adsorption process. When the adsorption equation was used to fit the kinetic model, it was found that the second-order adsorption model had a better fitting correlation coefficient (R2＞0.999) and the adsorbent had a low dissolution loss.
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Published: 25 February 2025
Online: 2025-02-18
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