Leaching performance of Al-bearing spent LiFePO_(4) cathode powder in H_(2)SO_(4) aqueous solution  

含铝废LiFePO_(4)正极粉在H2SO_(4)溶液中的浸出性能

作　　者：Wen-bo LOU Yang ZHANG Ying ZHANG Shi-li ZHENG Pei SUN Xiao-jian WANG Jian-zhong LI Shan QIAO Yi ZHANG Marco WENZEL Jan JWEIGAND 娄文博;张洋;张盈;郑诗礼;孙沛;王晓健;李建中;乔珊;张懿;Marco WENZEL;Jan JWEIGAND(东北大学冶金学院,沈阳110819;中国科学院过程工程研究所绿色过程与工程重点实验室,北京100190;Materials Science&Engineering,University of Utah,Salt Lake City 84112,USA;Faculty of Chemistry and Food Chemistry,Technische Universität Dresden,Dresden 01062,Germany)

机构地区：[1]School of Metallurgy,Northeastern University,Shenyang 110819,China [2]CAS Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [3]Materials Science&Engineering,University of Utah,Salt Lake City 84112,USA [4]Faculty of Chemistry and Food Chemistry,Technische Universität Dresden,Dresden 01062,Germany

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第3期817-831,共15页中国有色金属学报（英文版）

基　　金：The authors acknowledge the funding support from the Key Deployment Projects of Chinese Academy of Sciences(ZDRW_CN_2020-1);the Sino-German Cooperation Research Project under the Natural Science Foundation of China(51761135108);the German Research Foundation(392417756);the CAS Interdisciplinary Innovation Team.

摘　　要：The leaching performance and leaching kinetics of LiFePO_(4)(LFP)and Al in Al-bearing spent LFP cathode powder were systematically studied.The effects of temperature(273−368 K),stirring speed(200−950 r/min),reaction time(0−240 min),acid-to-material ratio(0.1:1−1:1 mL/g)and liquid-to-solid ratio(3:1−9:1 mL/g)on the leaching process were investigated.The results show that the concentration of reactants and the temperature have a greater impact on the leaching of Al.Under the optimal conditions,leaching efficiencies of LFP and Al are 91.53%and 15.98%,respectively.The kinetic study shows that the leaching of LFP is kinetically controlled by mixed surface reaction and diffusion,with an activation energy of 22.990 kJ/mol;whereas the leaching of Al is only controlled by surface chemical reaction,with an activation energy of 46.581 kJ/mol.A low leaching temperature can effectively suppress the dissolving of Al during the acid leaching of the spent LFP cathode material.研究含铝废LiFePO_(4)(LFP)正极粉中LFP和Al的浸出行为及浸出动力学。考察温度(273~368 K)、搅拌速率(200~950 r/min)、反应时间(0~240 min)、酸料比(0.1:1~1:1 mL/g)和液固比(3:1~9:1 mL/g)对浸出过程的影响。结果表明,反应物浓度和温度对Al浸出影响较大。在优化的浸出条件下,LFP和Al的浸出率分别为91.53%和15.98%。动力学研究表明,LFP的浸出受表面化学反应与扩散混合控制,活化能为22.990 kJ/mol;而Al的浸出仅受表面化学反应的控制,活化能为46.581 kJ/mol。在废LFP正极材料酸浸过程中控制浸出体系低温能有效抑制铝的溶解。

关 键 词：LiFePO_(4) aluminum leaching performance leaching kinetics 

分 类 号：TF821[冶金工程—有色金属冶金]