Abstract A simple method is introduced to obtain recycled Nd-Fe-B powders from waste bonded Nd-Fe-B bulk magnets. The main difficulty of the recovery of waste MQ bonded Nd-Fe-B magnets is how to remove the epoxy resins between the magnetic particles and the oxide impurities on the surfaces of the waste magnetic powders. Mixed solvents of acetone, Dimethyl Formamide and N-butyl alcohol were used to dissolve the epoxy resins. Oxide impurities were removed using 0.5% acetic acid/acetone solutions. After these treatments, the carbon and oxygen contents were reduced from 21,200 ppm to 9700 ppm, and from 11,007 ppm to 8177 ppm, respectively. Under optimum processing conditions, the recycled magnetic powders possess improved magnetic properties with Ms of 151.5 emu/g, Mr of 98.0 emu/g, Hcj of 7.1 kOe, and (BH)max of 13.7 MGOe. These values, compared to the waste magnetic powders, represent increases of 21.2%, 18%, 0 and 34.3%, respectively.

中文翻译：

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废MQ粘结钕铁硼磁体回收技术研究

摘要 介绍了一种从废弃粘结Nd-Fe-B块状磁铁中获得再生Nd-Fe-B粉末的简单方法。废MQ粘结钕铁硼磁体回收的主要难点是如何去除磁粉间的环氧树脂和废磁粉表面的氧化物杂质。使用丙酮、二甲基甲酰胺和正丁醇的混合溶剂溶解环氧树脂。使用 0.5% 乙酸/丙酮溶液去除氧化物杂质。经过这些处理后，碳和氧的含量分别从 21,200 ppm 减少到 9700 ppm，从 11,007 ppm 减少到 8177 ppm。在最佳加工条件下，回收的磁粉具有改进的磁性能，Ms 为 151.5 emu/g，Mr 为 98.0 emu/g，Hcj 为 7.1 kOe，(BH)max 为 13.7 MGOe。这些价值观，