Magnetic property recovery in Nd-Fe-B bonded magnet wastes with chemical reaction and physical dissolution

作     者：Min Liu Haiyuan Cui Qingyan Li Peihong Zhu Weiqiang Liu Qingmei Lu Dongtao Zhang Zaisheng Pang Xi Yu Chunhui Yu Shanshun Zha Youhao Liu Xiaofei Yi Ming Yue Min Liu;Haiyuan Cui;Qingyan Li;Peihong Zhu;Weiqiang Liu;Qingmei Lu;Dongtao Zhang;Zaisheng Pang;Xi Yu;Chunhui Yu;Shanshun Zha;Youhao Liu;Xiaofei Yi;Ming Yue

作者机构：Laboratory of Advanced Functional MaterialsMinistry of EducationFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Ganzhou Fortune Electronic Co.Ltd.Canzhou 341000China Earth-Panda Advanced Magnetic Materials Co.Ltd.Hefei 231500China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2021年第39卷第11期

页      面：1396-1401,I0003页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Project supported by the National Key Research and Development Program of China (YFC1903405) Major Science and Technology Projects of Anhui Province (201903a07020002) the Beijing Municipal Natural Science Foundation (2172012) Program of Top Disciplines Construction in Beijing(PXM2019014204500031),China 

主　　题：Nd-Fe-B bonded magnet wastes Epoxy resin Open-loop reaction Physical dissolution Recycled magnetic powders Rare earths 

摘      要：The main difficulty for the recovery of Nd-Fe-B bonded magnet wastes is how to completely remove the epoxy *** this study,chemical reaction and physical dissolution were combined to remove the epoxy resins by adding ammonia-water and mixed organic ***-water can react with the epoxy functional group of epoxy resin to generate *** organic solvents of alcohol,dimethyl formamide(DMF),and tetrahydrofuran(THF) can dissolve the generated polyols and residual epoxy *** the optimum processing conditions,the epoxy resins in the waste magnetic powders are substantially *** oxygen and carbon contents in the recycled magnetic powder are reduced from 13500 × 10^(-6) to 1600 × 10^(-6) and from 19500 × 10^(-6) to 2100 × 10^(-6) with the reduction ratio of88.1% and 89.2%,*** recycled magnetic powder presents improved magnetic properties with MS of 1.306 × 10^(-1) A·m^(2)/g,Mr of 0.926 × 10^(-1) A·m^(2)/g,Hcj of 1.170 T,and(BH)max of 125.732 kJ/m^(3),which reach 99.8%,99.4%,95.9%,and 96.9% of the original magnetic powders,respectively.