Research Progress of Comprehensive Recycling of Nd-Fe-B Waste at Home and Abroad
The production process of Nd-Fe-B permanent magnet material called"King of Magnets"will inevitably produce a large amount of trimmings,which contains about 30%of rare earths,if the rare earths are not recycled,it will not only cause waste of resources,but also affect the environment.In this paper,the research progress of Nd-Fe-B permanent magnet material recycling at home and abroad in recent years was reviewed,and the research of domestic methods were analyzed,such as hydrochloric acid preferential solution method,FeO-B2O3 composite slag selective oxidation method,(NH4)2SO4 roasting method,carbon thermal reduction method,carbon/hydrogenation-hydrolysis method,anodic electrolytic oxidation method,etc.Meanwhile,foreign B2O3-FeO-Fe2O3-Nd2O3 system selective oxidation method,supercritical carbon dioxide extraction method,oxalic acid leaching method,pyrometallurgical method and other technology research methods were introduced,and on this basis,the future research focus in selective recovery of Nd-Fe-B scrap was prospected.
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维普
