Li_(4)Mn_(5)O_(12)的改进合成及其在卤水中的选择性提锂性能  

Improved Synthesis of Li_(4)Mn_(5)O_(12) and its Selective Extraction of Lithium from Brine

作　　者：何柳柳 李凌平 王磊[1,2,3] 王蕾 妥麟[4] 王旭东 吕永涛[1,2,3] HE Liuiu;LI Lingping;WANG Lei;WANG Lei;TUO Lin;WANG Xudong;LÜYongTao(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an,710055,China;Research Institute of Membrane Separation Technology of Shaanxi Province,Xi'an,710055,China;Shanxi Key Laboratory of Environmental Engineering,Xi'an,710055,China;The Fifth Brigade of Tibet Autonomous Region Geology and Mineral Explorationand Development Bureau,Lasa,850000,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]陕西省膜分离技术研究院,陕西西安710055 [3]陕西省环境工程重点实验室,陕西西安710055 [4]西藏自治区地质矿产勘查开发局第五地质大队,西藏拉萨850000

出　　处：《盐湖研究》2025年第1期18-27,共10页Journal of Salt Lake Research

基　　金：西藏自治区科技计划项目(XZ202101ZY0006G);国家重点研发计划课题(2022YFC2904303);陕西省科学技术厅项目(2019JM-596)。

摘　　要：采用溶胶凝胶法,以乙酸锂、乙酸锰为原料,柠檬酸为络合剂,引入螯合剂乙二醇改善凝胶性质,同时对合成条件进行优化,制备出了锂离子筛前驱体Li_(4)Mn_(5)O_(12),酸洗后得到锂离子筛H_(4)Mn_(5)O_(12)。采用XRD、TG-DTA、FTIR、SEM、XPS等手段对不同阶段的H_(4)Mn_(5)O_(12)结构特性进行研究、并利用吸附动力学、卤水中共存离子的分配系数及分离因子等分析方法,开展H_(4)Mn_(5)O_(12)对卤水中Li^(+)的选择分离性能研究。结果表明,所制备的H_(4)Mn_(5)O_(12)锂离子筛对盐湖卤水中的Li^(+)具有优异的选择分离性能,在镁锂比为86左右的青海大柴旦盐湖中初始锂吸附容量达到36.80 mg/g,锰损率仅为0.71%。H_(4)Mn_(5)O_(12)在卤水中对Li^(+)的吸附符合伪二级动力学模型,属于化学吸附。经过10次的吸附解吸循环实验,吸附容量仍有26.62mg/g,锰损率为0.79%,循环稳定性能优异,为高镁锂比盐湖锂吸附材料的研究提供了一定的思路。Using lithium acetate and manganese acetate as raw materials,citric acid as complexing agent,ethylene glycol as dispersant and stabilizer,the precursor of Li_(4)Mn_(5)O_(12) lithium ion screen was prepared by sol-gel method.XRD,TG-DTA,FTIR,SEM,XPS,adsorption kinetics,partition coefficient and separation factor of coexisting ions in brine were used to study the structure of H_(4)Mn_(5)O_(12) lithium ion screen at different stages and its selective separation performance for Li^(+)in brine.The results show that the prepared H_(4)Mn_(5)O_(12) lithium ion screen has excellent selectivity and separation performance for Li^(+)in salt lake brine.The initial lithium adsorption capacity reaches 36.80 mg/g and the dissolution loss rate of Mn^(2+) is only 0.71%in Daqaidan Salt Lake of Qinghai Province,where the MG-lithium ratio is about 86.The adsorption of Li+by H_(4)Mn_(5)O_(12)in brine conforms to the pseudo-second-order kinetic model,which belongs to chemisorption.After 10 times of adsorption analysis cycle experiments,the adsorption capacity is still 26.62 mg/g,and the dissolution loss rate of Mn^(2+)is 0.79%,which has good cyclic stability,and provides a certain idea for the research of lithium adsorption materials in salt lakes with high magnesia-lithium ratio.

关 键 词：盐湖卤水提锂 锂离子筛 吸附剂 选择性 稳定性 

分 类 号：TQ131[化学工程—无机化工]