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METHODS FOR SELECTIVE RECOVERY OF RARE EARTHS IN AQUEOUS ACID PHASES RESULTING FROM THE TREATMENT OF PERMANENT MAGNETS USED OR REBUIDED
METHODS FOR SELECTIVE RECOVERY OF RARE EARTHS IN AQUEOUS ACID PHASES RESULTING FROM THE TREATMENT OF PERMANENT MAGNETS USED OR REBUIDED
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机译:因使用或再生永磁体的处理而在酸性阶段选择性回收稀土的方法
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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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