摘要
以某盐湖提钾后老卤为研究对象,其中锂含量仅有0.15g/L,镁锂比达到800∶1。磁性铝系吸附剂的饱和吸附容量为4.3mg/g,提锂后吸附剂利用超导磁选机实现与卤水的固液分离,同步实现洗盐和解吸,最终得到含锂解吸液产品。研究表明,超导磁选机采用钢网片聚磁介质,背景磁场强度2 400kA/m,吸附剂浓度10%,下料速度10cm/s的情况下,吸附剂的截留率达到99%以上。在500mL淡水洗盐,1.5L淡水解吸,解吸液中Li^+0.28g/L,Mg^2+0.57g/L,全流程卤水中锂的回收率在80%以上;吸附剂在磁选机进行100次吸附解吸循环,吸附剂累计丢失8.9%。该工艺有一定的工业利用价值。
Old brine with Li^+0.15 g/L and Mg^2+119.5 g/L after potassium extraction from a salt lake was researched.Saturated adsorption capacity of magnetic aluminum-based adsorbent is 4.3 mg/g.Separation of adsorbent from brine was carried out by superconducting magnetic separator to realize synchronization salt leaching and desorption.Final product is lithium-bearing stripping solution.The results show that retention rate of adsorbent is 99% above under the conditions including superconducting magnetic separator adopting steel mesh medium,background magnetic field strength of 2 400 kA/m,adsorbent concentration of 10%,and feeding speed of 10 cm/s.Recovery rate of lithium from brine in whole process is 80% above under the conditions including salt leaching with 500 mL fresh water,desorption with 1.5 L fresh water,and concentration of Li^+and Mg^2+ in desorption solution of 0.28 g/L and 0.57 g/L respectively.Lost of adsorbent is 8.9% after 100 adsorption desorption cycles in magnetic separation system.This process has certain industrial value in practice.
作者
张凯
李亦然
马君耀
侯愷
ZHANG Kai;LI Yi-ran;MA Jun-yao;HOU Kai(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;Jiangsu Jack-Zhongke Superconducting Technologies Co.,Ltd.,Jiangyin 214404,Jiangsu,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2020年第3期32-37,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(41867021)
江西省自然科学基金资助项目(20171BAB206048)。
关键词
超导磁分离
吸附
解吸
卤水
提锂
superconducting magnetic separation
adsorption
desorption
brine
lithium extraction
作者简介
张凯(1995-),男,湖北荆门人,硕士研究生;通信作者:李亦然(1984-),男,江西南昌人,博士,副教授。
