偏钛酸型离子交换剂的制备及其对锂的富集性能  

Synthesis of Lithium Metatitanate and Its Enrichment for Lithium by Ion Exchange

作　　者：刘峙嵘[1] 王长福[1] 赖毅[1] 张寰[1] 王云[1] 周利民[1] 

机构地区：[1]东华理工大学化学生物与材料科学学院,江西南昌330013

出　　处：《过程工程学报》2015年第1期147-152,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:11375043);江西省科技支撑计划资助项目(编号:20133BBF60016)

摘　　要：以钛酸四丁酯和乙酸锂为原料,采用醇盐水解溶胶-凝胶法制备了偏钛酸锂前驱体,经酸浸脱锂后得可选择性富集锂的离子交换剂,对前驱体及离子交换剂的晶相及选择性富集能力进行了研究.结果表明,固液比为4 g/L,p H=12.8,纯Li溶液初始浓度200 mg/L,35℃恒温振荡条件下吸附3 h,Li2Ti O3(H)对Li+吸附容量为33.5345 mg/g.吸附过程可用准二级动力学模型和Langmuir吸附等温模型描述,属自发放热吸附反应.The lithium metatitanate precursor was synthesized by alkoxide hydrolysis and sol-gel method with tetrabutyl titanate and lithium acetate as raw materials. The ion exchanger with selective enrichment property for lithium ion was prepared and further modified by acid treatment to extract lithium from lattice. The structure and ion enrichment of lithium metatitanate precursor and lithium metatitanate ion exchanger were examined. The results indicate that the ion exchanger has a high selective enrichment, and the maximum adsorption capacity of lithium ion is 33.534 5 mg/g at p H 12.8 and 35 with initial lithium ion concentration 200 mg/L. The adsorption ℃isotherms obey the Langmuir isotherm models. Thermodynamic data show that it is a spontaneous exothermic adsorption process of pseudo-second order kinetics.

关 键 词：偏钛酸型离子交换剂 锂离子 吸附 富集 

分 类 号：X703.1[环境科学与工程—环境工程]