铝系成型锂吸附剂性能测试评价与对比  

Performance evaluation and comparison of aluminum-based granulated lithium adsorbent

作　　者：张瑞[1,2] 陆旗玮 林森[1,2] 于建国[1,2] ZHANG Rui;LU Qiwei;LIN Sen;YU Jianguo(National Engineering Research Center for Integrated Utilization of Salt Lake Resources,East China University of Science and Technology,Shanghai 200237,China;Engineering Research Center of Salt Lake Resources Process Engineering,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China;Shanghai Guobo Automotive Science and Technology Co.,Ltd.,Shanghai 200131,China)

机构地区：[1]华东理工大学国家盐湖资源综合利用工程技术研究中心,上海200237 [2]华东理工大学资源过程工程教育部工程研究中心,上海200237 [3]上海国玻汽车科技有限公司,上海200131

出　　处：《化工学报》2021年第6期3053-3062,共10页CIESC Journal

基　　金：国家自然科学基金项目(U20A20142,21978094);青海省重大科技专项(2019-GX-A7)。

摘　　要：我国察尔汗盐湖卤水中蕴含丰富的锂资源,但总体品位较低,具有锂浓度低、镁锂比高的特点,导致开发难度很大。吸附法是针对高镁锂比卤水进行提锂的有效方法,其中铝系锂吸附剂具有洗脱无溶损的优势,目前已在盐湖提锂工业中应用。分别对两种工业化铝系锂吸附剂A、B以及实验室自制吸附剂C进行了系统化表征与吸附性能评价。实验结果显示三种成型吸附剂的有效成分均是锂铝层状氢氧化物,在静态吸附条件下,25℃时吸附剂A、B、C对察尔汗老卤中锂的吸附量分别为2.23、0.45、4.90 mg·g^(-1),吸附动力学均符合拟二级动力学方程,不同温度下吸附等温线拟合结果表明Sips三参数模型能够准确描述三种吸附剂的吸附过程。Lithium resources are abundant in Qarhan Salt Lake in China.However,the overall grade is low,with the characteristics of low lithium concentration and high magnesium-lithium ratio,which makes development difficult.It has been proved that the adsorption method is effective for extracting lithium from brines with an ultrahigh Mg/Li ratio,especially,the lithium aluminum double layered hydroxides is the only adsorbent for industrial application relying on the advantage of elution without dissolution.In this work,the laboratory-made granulated adsorbent(C)and other adsorbents(A,B)that have been industrialized are evaluated to compare the adsorption performances.Through the characterization analysis of these adsorbents,the adsorbent C displays a good mechanical strength without dissolution or powder lose,declaring a great granulation process.The adsorption capacities of adsorbent A,B and C are 2.23 mg·g^(-1),0.45 mg·g^(-1) and 4.90 mg·g^(-1),respectively.All adsorption courses are in accordance with the pseudo-second-order kinetic equation.The fitting results of adsorption isotherms at different temperatures show that the Sips three-parameter model can describe the adsorption of the three adsorbents accurately.

关 键 词：高镁锂比卤水 锂铝层状氢氧化物 吸附提锂 吸附剂成型 

分 类 号：TQ133.1[化学工程—无机化工] TQ131.11