文献类型：期刊文献

英文题名：Multiphysics-coupled electrosynthesis of high-purity magnetite from steel pickling waste liquor: synergistic optimization of electrode configuration and flow field

作者：Fang, Jie[1,2];Hua, Lanfang[1,2];Fan, Huiqi[1,2];Jia, Daqing[1,2];Huang, Guangtuan[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China

年份：2026

卷号：56

期号：3

外文期刊名：JOURNAL OF APPLIED ELECTROCHEMISTRY

收录：;EI(收录号：20260620016866);WOS:【SCI-EXPANDED(收录号:WOS:001677094500007)】；

语种：英文

外文关键词：Steel pickling waste liquor; Numerical simulation; Electrochemical synthesis; Magnetite; Multiphysics coupling model

摘要：The purity of magnetite recovered from steel pickling waste liquor (SPWL) via electrochemical technology remains low. This study developed a three-dimensional multi-physics field coupling model and optimized the structural parameters of the electrochemical reactor to achieve high-purity magnetite from steel pickling waste liquor. The regulatory mechanism of electrode arrangement on the electrochemical field was revealed through numerical simulations. Compared to parallel electrodes, the alternating electrode arrangement increased electric field strength by 13.4% and current density by 20.1%. Experimental validation showed that this electrode arrangement enhanced magnetite purity to 97.62%. Additionally, a quantitative relationship between stirring parameters and flow field uniformity was established through computational fluid dynamics simulation. The optimal mixing conditions were found to be 60 mm blade diameter, 10 mm blade installation height, and 400 rpm rotation speed. Flow field optimization improved Fe2+/Fe3+ mass transfer efficiency, promoted lattice orientation coordination, and raised magnetite purity to 98.01%. The dynamic mechanism of magnetite electrosynthesis was further elucidated through electrode surface pH monitoring, video frame capture, and X-ray diffraction characterization. It was found that Fe2+ is electro-oxidized to Fe3+ at the anode, while OH- is generated through water reduction at the cathode. These species undergo electromigration-diffusion-convection transport, forming Fe(OH)(2)/Fe(OH)(3) mixed colloids, which ultimately assemble into a spinel structure with a Fe2+: Fe3+ molar ratio of 1:2. This study provides a novel solution for the resource-based high-value utilization of acidic heavy metal wastewater.