| LiMn2O4离子筛成型及锂吸附性能 |
| Granulation to LiMn2O4 Ion-Sieve and Its Lithium Adsorption Property |
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| 摘要: 采用PVC为粘结剂制备了LiMn2O4离子筛球型颗粒，分析了PVC添加量对离子筛吸附性能的影响，并通过扫描电境(SEM)、静态和动态连续锂吸附实验研究了PVC粘结剂对离子筛形貌和锂离子吸附性能的影响。结果表明，SMO-a、SMO-b和SMO-p样品的锂离子静态吸附数据与Lagergren方程吻合良好，吸附速率常数依次为1.03×10-5、1.06×10-5 s-1和9.72×10-6 s-1；SMO-a样品的静态饱和吸附量达到2.50 mmol·g-1，PVC造粒对离子筛的静态条件下的饱和吸附容量和吸附速率影响很小，但连续动态操作条件下SMO-a的吸附容量降低为1.11 mmol·g-1；经盐酸洗涤脱附后，Li+最大富集倍数约为9。 |
| 关键词: 二氧化锰 离子筛 锂 选择性吸附 卤水 |
| 基金项目: |
| Abstract: The granular-type LiMn2O4 adsorbent was prepared by the solvent-exchange method using PVC as a binder and was then changed to H type ion-sieve by proper dilution with HCl solution. The effect of PVC content during the preparation process was studied on the surface morphology and the lithium-ion exchange ability were studied by SEM and static/dynamic adsorption-desorption measurement. Static adsorption kinetics of SMO-a, SMO-b and SMO-p sample is well accorded with Lagergren equation with the first order adsorption rate constant of 1.03×10-5, 1.06×10-5 and 9.72×10-6 s-1，respectively, and the static ion-exchange capacity for lithium ions of SMO-a is 2.50 mmol·g-1. The PVC-granulation process of LiMn2O4 superfine powder has little influence on the static adsorption capacity of the ion-sieve, however, the capacity decreases to 1.11 mmol·g-1 during the dynamic adsorption process. The maximum enrichment of lithium as evaluated by hydrochloric acid elution is 9 folds. |
| Keywords: MnO2 ion-sieve lithium selective adsorption brine |
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| 肖国萍,彭 洁,张钦辉,于建国.LiMn2O4离子筛成型及锂吸附性能[J].无机化学学报,2010,26(3):435-439. |
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