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Method for the selective recovery of rare earth metals present in an acidic aqueous phase resulting from the treatment of used or discarded permanent magnets
Method for the selective recovery of rare earth metals present in an acidic aqueous phase resulting from the treatment of used or discarded permanent magnets
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机译:选择性回收存在于酸性水相中的稀土金属的方法,该稀土金属是由于处理过的或废弃的永磁体而产生的
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摘要
The invention relates to a hydrometallurgical process which makes it possible to selectively recover at least one “heavy” rare earth metal, i.e. a rare earth metal with an atomic number at least equal to 62, that is in an acidic aqueous phase resulting from the treatment of spent or scrapped permanent magnets. It also relates to a hydrometallurgical process which makes it possible to selectively recover, on the one hand, at least one heavy rare earth metal present in an acidic aqueous phase resulting from the treatment of spent or scrapped permanent magnets and, on the other hand, at least one “light” rare earth metal, i.e. a rare earth metal with an atomic number at most equal to 61, that is also in this acidic aqueous phase. The invention has in particular an application in the recycling of rare earth metals present in spent or scrapped permanent magnets of the type Neodymium-Iron-Boron (or NdFeB) and, in particular, dysprosium, praseodymium and neodymium, and also in the recycling of samarium present in spent or scrapped permanent magnets of the type samarium-cobalt (or SmCo).
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