化工矿物与加工2023，Vol.52Issue(12)：14-21,8.DOI:10.16283/j.cnki.hgkwyjg.2023.12.003
低锂盐湖原卤吸附提锂试验研究
Experimental study on lithium extraction from raw brine of salt lakes with low content of lithium by adsorption
摘要
Abstract
Directly adsorbing and extracting lithium from low lithium salt lake brine can achieve efficient utilization of low-grade lithium resources,which is of great significance for improving China's lithium salt supply pattern.Using a self-developed new lithium adsorbent,the adsorption effect of lithium ions on a low lithium and high magnesium salt lake brine(Li mass concentration 50～70 mg/L,magnesium lithium ratio 650～680)in Qinghai Province was studied.The results showed that when the temperature was 25℃,the adsorption time was 20 hours,the pH regulator addi-tion ratio was 1∶1,and the solid-liquid ratio was 1∶500,the saturated adsorption capacity of the adsorbent was 24.6 mg/g,and the adsorption rate was 92.8%,The adsorption limit of the adsorbent for lithium ions in brine is≥5 mg/L;During the desorption process,under the conditions of temperature of 25℃,acid concentration of 0.045 mol/L,adsorbent to acid solution ratio of 1 g∶45 mL,and desorption time of 12 hours,the resolution rate reaches 100%.Under optimized experimental conditions,20 cycles were conducted,with an average adsorption capacity of 24 mg/g,a resolution rate of nearly 100%,and a single dissolution loss rate of≤0.01%.This adsorbent can be used for direct lithium extraction from low lithium salt lake brine with a lithium mass concentration below 70 mg/L.It has the advan-tages of high adsorption rate,large adsorption capacity,and low single dissolution loss rate.关键词
低锂盐湖/高镁锂比/吸附剂/原卤/提锂/吸附容量/吸附时间Key words
salt lakes with low lithium/high mass ratio of magnesium to lithium/adsorbent/raw brine/lithium extraction/adsorption capacity/adsorption time分类
轻工业引用本文复制引用
赖先熔,孙豪,陈周秦,阳超..低锂盐湖原卤吸附提锂试验研究[J].化工矿物与加工,2023,52(12):14-21,8.基金项目
西藏阿里地区科技计划项目(ALKJ-BJCZ-2023-07). （ALKJ-BJCZ-2023-07）
