Extraction of rare-earth elements from rare-earth magnets

这项研究涉及使用玻璃渣材料从稀土磁体中提取稀土。当NdFeB磁体材料在熔融的三氧化二硼中熔化和凝固时，得到的NdFeB磁体材料具有细小的α-Fe和Fe2B相以及树枝晶Fe2B相。在熔融的三氧化二硼中熔融和凝固的NdFeB磁体材料的化学分析表明，在凝固过程中，NdFeB磁体材料中的钕被完全提取出来。当Sm-Co磁体材料在熔融的三氧化二硼中熔化和凝固时，SmCo5相分解为Sm氧化物相和Co相。玻璃渣法是通过周围熔融的玻璃渣料来提取氧化Sm相。当Sm-Fe-N磁体在熔融的三氧化二硼中熔化和凝固时，使用三氧化二硼的玻璃渣法也成功地将Sm-Fe-N合金分离出金属组分和渣组分。化学分析证实，金属成分中的Sm含量非常有限，渣成分中含有大量的Sm。玻璃渣法适用于从稀土磁体中提取稀土元素。此外，还对玻璃渣法得到的含稀土三氧化二硼进行了化学回收处理。结果表明，该工艺能从含稀土的三氧化二硼中成功地提取出稀土元素。

This research involves using glass slag materials for the extraction of rare-earth from rare-earth magnets. When the Nd-Fe-B magnet materials were melted and solidified in the molten boron trioxide, the resultant Nd-Fe-B magnet materials had fine grains of α-Fe and Fe_2B phases together with the dendritic Fe_2B phase. The chemical analysis of the Nd-Fe-B magnet materials melted and solidified in the molten boron trioxide revealed that the neodymium was completely extracted from the Nd-Fe-B magnet materials during the solidification. When the Sm-Co magnet materials were melted and solidified in the molten boron trioxide, the magnetic SmCo_5 phase decomposed into Sm oxide phase and Co phases. The Sm oxide phase was extracted by the surrounding molten glass slag materials in the glass slag method. When the Sm-Fe-N magnets were melted and solidified in the molten boron trioxide, Sm-Fe-N alloys were also successfully separated into the metallic component and the slag component by the glass slag method using boron trioxide. The chemical analyses confirmed that the Sm content in the metallic component was very limited and the slag component contained a large amount of samarium. The glass slag method was suitable for the extraction of rare earth elements from the rare-earth magnets. In addition, a chemical recycling process was applied to the resultant rare-earth-containing boron trioxide obtained by the glass slag method. it was found that the rare-earth element was successfully extracted from the rare-earth -containing boron trioxide by this process.