铝基锂吸附剂分离高钠型地下卤水锂资源过程研究  

Study on lithium resource separation from underground brine with high concentration of sodium by aluminum-based lithium adsorbent

作　　者：盛冰纯 于建国[1,2] 林森[1,2] SHENG Bingchun;YU Jianguo;LIN Sen(National Engineering Research Center for Integrated Utilization of Salt Lake Resources,East China University of Science and Technology,Shanghai 200237,China;Joint International Laboratory for Potassium and Lithium Strategic Resources,East China University of Science and Technology,Shanghai 200237,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]华东理工大学锂钾战略资源国际联合实验室,上海200237

出　　处：《化工学报》2023年第8期3375-3385,共11页CIESC Journal

基　　金：国家自然科学基金项目(21978094,U20A20142);上海市青年科技启明星计划项目(22QA1402700)。

摘　　要：铝基锂吸附剂由于其解吸条件温和,不发生溶损,是目前唯一一种成功实现工业化生产的盐湖卤水提锂吸附剂,然而其在高钠型地下卤水中的应用可行性还有待考察。使用实验室自制的H-LDHs颗粒吸附剂,系统研究了吸附液进料流速、解吸温度及解吸液中离子浓度对固定床吸附和解吸过程的影响,实验结果表明,在高钠卤水中,当进料流速从1 BV/h(1 BV/h=0.170 L/h)增加到4 BV/h时,穿透时间缩短了79%,而穿透吸附容量仅降低了17.8%。升高解吸温度可显著提高固定床的Li+解吸量,而增大解吸液中的Na+浓度会抑制Li+的解吸。此外,开发了分段循环解吸工艺,并将其用于四川某地实际地下卤水提锂过程,该工艺能够有效实现解吸工段固定床出料液中Li+的富集。Aluminum-based lithium adsorbent is the only adsorbent which has achieved industrial application of lithium recovery from salt lakes due to its moderate desorption conditions without dissolution loss.However,its application feasibility in high-sodium underground brine remains to be investigated.The effects of the flow rate of brine,desorption temperature and the initial concentration of ions in eluent on adsorption and desorption processes in the fixed bed were systematically investigated with granular H-LDHs adsorbents homemade in the laboratory.The results showed that the breakthrough time decreased by 79%while the breakthrough adsorption capacity only decreased by 17.8%when the flow rate rose from 1 BV/h(1 BV/h=0.170 L/h)to 4 BV/h in high Na+brine.Increasing desorption temperature could significantly enhance the Li+desorption amount,however,the Li+desorption amount was suppressed with the increasing concentration of Na+in eluent.In addition,a stage-by-stage cyclic desorption technology was designed and applied on the real underground brine somewhere in Sichuan,which could effectively achieve the enrichment of Li+in the eluent during the desorption process.

关 键 词：铝基锂吸附剂 地下卤水 固定床 吸附提锂 分段循环解吸 

分 类 号：TQ131.1[化学工程—无机化工]