一种提锂杂化膜的制备及其提锂性能研究

摘要

Spinel-type manganese oxide (SMO) Li1.6Mn1.6O4was mixed with PVC,and then a new type of flat membrane was successfully prepared for recovering lithium from lithium-containing waters by a solvent-nonsolvent exchange method.After the hybrid membrane was treated with an HC1 solution,the membrane can uptake lithium,a series of experiments were given.As results showed,after the membrane was treated with an HC1 solution it showed a good performance in adsorption capacity with a maximum adsorption of 29 mg/g in six hours.When the adsorbed lithium was eluted by 0.5 mol/L HCl,the lithium extraction reached the balance and about 95 ％ lithium was extracted,and the loss rate of manganese dissolution is 3.5％.The membrane showed good selectivity for Li+ in the competitive adsorption with Na+,K+,Mg2+,Ca2+.Repeated experiments showed that this new membrane had a good stability.%将提锂吸附剂前驱体尖晶石型锰氧化物(Spinel-type manganese oxide,SMO) Li1.6-Mn1.6O4与聚氯乙烯(PVC)杂化,采用溶剂-非溶剂交换法成功制备了用于海水提锂的平板膜.该杂化膜用酸处理抽出其中的锂得到具有提锂性能的膜,对膜进行了一系列提锂性能测试.实验结果表明,酸洗处理后的膜对富锂溶液中锂的吸附约6h达平衡,最大吸附量为29 mg/g,之后采用0.5 mol/L HCl溶液脱锂约1h锂的脱出基本达到平衡,Li+的脱附率在95％左右,锰的溶损率在3.5％左右.该膜在含有Li+、Na+、K+、Mg2+、Ca2+离子的竞争吸附过程中对Li+表现出很好的选择性,同时重复实验也表明,这种提锂杂化膜具有很好的稳定性.