The main difficulty for the recovery of Nd-Fe-B bonded magnet wastes is how to completely remove the epoxy resins. In this study, chemical reaction and physical dissolution were combined to remove the epoxy resins by adding ammonia-water and mixed organic solvents. Ammonia-water can react with the epoxy functional group of epoxy resin to generate polyols. Mixed organic solvents of alcohol, dimethyl formamide (DMF), and tetrahydrofuran (THF) can dissolve the generated polyols and residual epoxy resins. Under the optimum processing conditions, the epoxy resins in the waste magnetic powders are substantially removed. The 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 of 88.1% and 89.2%, respectively. The recycled magnetic powder presents improved magnetic properties with M_s of 1.306 × 10⁻¹ A∙m²/g, M_r of 0.926 × 10⁻¹ A∙m²/g, H_cj of 1.170 T, and (BH)_max of 125.732 kJ/m³, which reach 99.8%, 99.4%, 95.9%, and 96.9% of the original magnetic powders, respectively.

钕铁硼粘结磁铁废料回收的主要难点是如何彻底去除环氧树脂。本研究采用化学反应和物理溶解相结合的方法，通过加入氨水和混合有机溶剂去除环氧树脂。氨水可与环氧树脂的环氧官能团反应生成多元醇。醇、二甲基甲酰胺 (DMF) 和四氢呋喃 (THF) 的混合有机溶剂可以溶解生成的多元醇和残留的环氧树脂。在最佳加工条件下，废磁粉中的环氧树脂基本去除。再生磁粉中氧、碳含量由13500×10 ^-6降低至1600×10 ^-6，由19500×10 ^{-6 降低}至2100×10^-6的减速比分别为 88.1% 和 89.2%。再生磁粉的磁性能得到改善，M _s为 1.306 × 10 ^-1  A∙m ² /g，M _r为 0.926 × 10 ^-1  A∙m ² /g，H _cj为 1.170 T，( BH ) _max 125.732 kJ/m ³，分别达到原磁粉的99.8%、99.4%、95.9%和96.9%。