文献类型：期刊文献

英文题名：Reduction in adsorbent granule dimensionality to strengthen lithium adsorption in low-grade salt lakes

作者：Chen, Jun[1,2];Yu, Jianguo[1,3];Lin, Sen[1,2]

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

年份：2025

卷号：71

期号：6

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20250917956819);WOS:【SCI-EXPANDED(收录号:WOS:001484688900038)】；

基金：This work was sponsored by the National Natural Science Foundation of China (92475114, 92475207) and the Shanghai Rising-Star Program (22QA1402700).

语种：英文

外文关键词：granulation; Li/Al-LDHs; lithium extraction; mass transfer; salt lake brine

摘要：Sluggish internal mass transfer within granulated adsorbents constrains the efficiency of Li+ extraction from low-grade salt lakes. In this study, Li+ diffusion behavior simulations using finite element analysis indicated that reducing the granule dimensionality enhanced Li+ transfer in aluminum-based lithium adsorbents, with ionic strength as the driving force. Hence, low-dimensional aluminum-based adsorbent granules (LD-LDHs) with fast transport channels and highly accessible adsorption sites were directionally prepared via a wet-spinning method. Adsorption kinetics suggested LD-LDHs with reduced internal diffusion resistance achieved equilibrium in less than 30 min, which was significantly shorter than the 36 h required for larger granules prepared by conventional extrusion molding, while maintaining the performance of the encapsulated active components. During continuous lithium extraction from low-grade Qarhan old brine, LD-LDHs reached adsorption saturation in 60 min, with a 1.8-fold increased working capacity, and the desorption solution was of higher quality, favorable for subsequent lithium carbonate production processes.