NdFeB磁体生产过程的边角料和废品,原来采用湿法回收,用去大量酸碱溶液,形成了含硼的污水,污染了环境。日立金属公司开发了碳热还原法,首先将NdFeB边角料或废品加热成为氧化物,然后加入碳,再加热成熔融状态,这时底下的铁作为生铁回收,浮在上面的渣经过处理可回收钕。日立金属公司已委托日本化学重工业公司进行工业化规模生产,回收的钕已用于NdFeB磁体产品。 NdFeB magnet production process scrap and scrap, the original wet recovery, with a lot of acid-base solution to form a boron-containing sewage polluting the environment. Hitachi Metals has developed a carbothermal reduction method, which first heats NdFeB scrap or scrap into an oxide, then adds carbon and reheats to a molten state, where the iron is recovered as pig iron, and the floating slag is treated to recover neodymium . Hitachi Metals has commissioned Nihon Keizai Heavy Industries Co. to carry out industrial-scale production and the recovered neodymium has been used in NdFeB magnet products.