锰系和铝系吸附剂对江汉盆地卤水中锂的吸附性能研究  

Study on Lithium Adsorption Properties of Manganese-based and Aluminum-based Adsorbents for the Brine from Jianghan Basin

作　　者：吕帅轲 赵云良[1] 陈立才 董广峰 温通 马松亮 张婷婷 LÜShuaike;ZHAO Yunliang;CHEN Licai;DONG Guangfeng;WEN Tong;MA Songliang;ZHANG Tingting(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Xinjiang Lop Nur Potassium Salt Co.,Ltd.,Hami 839000,China;School of Chemistry and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China)

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]国投新疆罗布泊钾盐有限责任公司,新疆哈密839000 [3]武汉轻工大学化学与环境工程学院,湖北武汉430023

出　　处：《金属矿山》2022年第8期94-100,共7页Metal Mine

基　　金：国家自然科学基金青年科学基金项目(编号:51904215)。

摘　　要：江汉盆地地下卤水锂资源储量丰富,具有很高的工业开发价值。研究利用XRD、SEM、BET对锰系和铝系锂吸附剂进行了表征,并通过静态吸附试验对比了两种吸附剂对江汉盆地卤水中锂的吸附性能。锰系吸附剂最佳吸附条件为:温度25℃、pH=8、液固比200 m L/g,吸附容量为3.93 mg/g;铝系吸附剂最佳吸附条件为:温度25℃、pH=7.1(原卤)、液固比400 m L/g,吸附容量为1.76 mg/g。经过5次循环试验,锰系吸附剂吸附容量是第一次的66.3%,铝系吸附剂吸附容量基本不变,铝系吸附剂的循环稳定性远优于锰系吸附剂。锰系和铝系吸附剂对Li^(+)的吸附符合拟二级动力学模型,是典型的化学吸附。BET分析表明锰系和铝系吸附剂均存在介孔结构,锰系吸附剂以大孔为主,铝系吸附剂以介孔为主。FTIR分析表明,锰系吸附剂吸附过程存在Li^(+)-H^(+)交换,铝系吸附剂在吸附Li^(+)的同时会吸附Cl-来平衡电荷。The underground brine lithium resource in Jianghan Basin is abundant and has high industrial exploitation value.The manganese-based and aluminum-based lithium adsorbents were characterized by XRD,SEM and BET,and their adsorption properties for lithium in Jianghan Basin brine were compared by static adsorption experiments.The optimum adsorption conditions of manganese-based adsorbent are:temperature 25℃,pH=8,liquid-solid ratio of 200 mL/g,and its adsorption capacity is 3.93 mg/g;the optimum adsorption conditions for aluminum-based adsorbent are∶25℃,pH=7.1(raw brine),liquid-solid ratio of 400 mL/g,and its adsorption capacity is 1.76 mg/g.After five cycle tests,the adsorption capacity of manganese-based adsorbent is 66.3%of that of the first time,and the adsorption capacity of aluminum-based adsorbent is basically unchanged,the cycle stability of aluminum-based adsorbent is much better than that of manganese-based adsorbent.The adsorption of Li^(+)by manganese-based and aluminum-based adsorbents conforms to the pseudo-second-order kinetic model,it is a typical chemisorption.BET analysis shows that both manganese-based and aluminum-based adsorbents have mesoporous structure,manganese-based adsorbent is mainly macroporous and aluminum-based adsorbent is mainly mesoporous.FTIR analysis shows that there is Li^(+)-H^(+)exchange in the adsorption process of manganese-based adsorbent,and aluminum-based adsorbent will adsorb Cl-to balance the charge while adsorbing Li^(+).

关 键 词：卤水提锂 锰系吸附剂 铝系吸附剂 吸附法 江汉盆地卤水 

分 类 号：TD955[矿业工程—选矿]