文献类型：期刊文献

英文题名：A modified HSDM coupling dynamic total salt concentration for simulating lithium loss in the fixed-bed washing process of aluminum-based adsorbents

作者：Wang, Sheng[1,2];Yang, Ying[1,2];Yu, Jianguo[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 Resources Proc Engn, Minist Educ, Shanghai 200237, Peoples R China

年份：2026

卷号：14

期号：3

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20261920693652);WOS:【SCI-EXPANDED(收录号:WOS:001769862600001)】；

基金：This work was supported by the National Key Research and Devel-opment Program of China (2023YFB4103502) and the National Natural Science Foundation of China (92475207) .

语种：英文

外文关键词：Lithium recovery; Fixed bed column; Washing process; Aluminum-based adsorbent; Homogeneous Surface Diffusion Model

摘要：In continuous lithium extraction using aluminum-based adsorbents, the decrease in total salt concentration of residual high-salinity brine during fixed-bed washing alters lithium adsorption equilibrium and affects lithium loss. To describe this behavior, a modified homogeneous surface diffusion model (HSDM) was developed by coupling multivariable adsorption equilibrium, total salt transport, and lithium diffusion, using granular Li/Al-LDHs as the adsorbent. Based on 270 batch equilibrium datasets, artificial neural network (ANN) and symbolic regression (SR) models were established to describe the effects of equilibrium lithium concentration, total salt concentration, and temperature on adsorption capacity. Although ANN gave higher prediction accuracy, SR provided an explicit equation and was therefore incorporated into the modified HSDM. A total-salt transport submodel was further introduced to describe the displacement and attenuation of residual high-salinity brine during washing. The results showed that Mg2+ could reasonably represent total salt variation in the early washing stage, while inclusion of Li+ improved the description in the middle-to-late stage. The modified HSDM effectively described outlet lithium concentration during washing, with an R2 of 0.969 and an RMSE of 56.6 mg/ L at 35 mL/min.