文献类型：期刊文献

英文题名：Lithium recovery from ultrahigh Mg2+/Li+ ratio brine using a novel granulated Li/Al-LDHs adsorbent

作者：Zhong, Jing[1,2];Lin, Sen[1,3];Yu, Jianguo[1,3]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Salt Lake Resources Proc Engn, Minist Educ, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2021

卷号：256

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20204009292501);WOS:【SCI-EXPANDED(收录号:WOS:000674614600009)】；

基金：This work was sponsored by the National Natural Science Foundation of China (21978094, 51704121) and Major Science and Technology Projects of Qinghai Province (2019-GX-A7).

语种：英文

外文关键词：Lithium aluminum layered double hydroxides; Granulation; Ion selectivity; Desorption; Column experiment

摘要：A novel granulation method with high hydrophilia and considerable mechanical strength was developed for the lithium aluminum double hydroxides (Li/Al-LDHs) to recover lithium from old brines with ultrahigh Mg2+/Li+ ratios. The granulated Li/Al-LDHs (GLDH) displayed a great structure stability and Li+ adsorption capacity could reach up to 4.92 mg/g without weakening on the encapsulated Li/Al-LDHs at 303 K. The pore volume diffusion model (PVDM) based on adsorption isotherms was conducted to confirm that the Li+ adsorption process was controlled by the pore volume diffusion in GLDH. Besides, GLDH showed a great selectivity to Li+ with an ion selective sequence of Li+ > Na+ > K+yMg2+ > Ca2+, especially alpha LiMg could reach to 156.1. The column experiments declared that the adsorbed Li+ could be easily eluted by neutral Li+-containing solution and the Mg2+/Li+ ratio could decrease significantly from 301.58 in old brine to 0.99 in the strip solution. The working Li+ adsorption capacity of packed GLDH column exceeded 2.6 mg/g when Qarhan old brine was fed at a flow rate of 15 mL/min. Moreover, it was found that the strip solution with Li+ concentration less than 150 mg/L would cause the structure collapse of Li/Al-LDHs.