Japan has developed a new method for recovering rare earth from neodymium magnets
Researchers from the University of Tokyo, Okabe and other researchers have developed a method for the effective recovery of rare earths from neodymium magnets, saying that the use of this method to recover rare earths does not produce harmful waste liquid.
The rare earth components such as lanthanum and cerium contained in the neodymium magnet amount to 30% in total, but most of them are discarded along with the waste because the recovery cost is high. Neodymium magnets are the strongest artificial permanent magnets and are widely used in various products such as electric vehicles and hard disks.
Professor Okabe et al. developed a method in which a neodymium magnet was charged into a solution such as zinc iodide or magnesium chloride for recovery. After the hydrazine and hydrazine are precipitated, they will vaporize and evaporate to achieve separation. It is reported that the recovery rate can reach 80% to 90%.
Since the iron in the magnet does not precipitate, the waste liquid containing the metal is not recovered, and the influence on the environment is small. At present, the research is still at the basic stage. Professor Okabe said that “the neodymium magnets used in electric vehicles, high-performance air conditioners, etc. will be discarded after 10 years. The technology of recycling and recycling must be developed before then”.
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