High-abundance rare earth iron boron regenerated magnet and preparation method thereof

The invention discloses a high-abundance rare earth iron boron regenerated magnet and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet materials and recovery thereof. The method comprises the following steps: performing surface treatment on high-abundance Ce/La rare earth iron boron unqualified products, processing material heads and the like, and performing coarse crushing and hydrogen explosion powder preparation; ce, La, Nd and Pr rare earth alloy is prepared through a rapid hardening melt-spinning technology and subjected to hydrogen explosion; the regenerated sintered magnet is obtained by ball-milling, mixing, orienting and profiling the two materials according to a certain proportion and then sintering and thermally treating the two materials. According to the regenerated magnet prepared through the method, the waste utilization rate reaches up to 95%, the rare earth adding amount is low (0-5 wt.%), the light rare earth adding proportion (LaCe/NdPr) is hig