Method for reusing sintered reclaimed NdFeB material

Abstract

The invention provides a method for reusing a sintered reclaimed NdFeB material. According to the method for reusing the sintered reclaimed NdFeB material, the sintered reclaimed NdFeB material becomes a powder material with a certain granularity after breaking, hydrogen decrepitation, sieving, mixing and crushing through an air stream mill are conducted, a Pr-Nd or Nd rare earth nanometer additive is added to the sieved powder material through a jet-propelled method in an argon atmosphere, and then the sieved powder material and the additive are evenly mixed; magnetic field orientation forming, isostatic pressing and sintering are conducted on the sampled powder material, so that a sintered sample is formed, then performance detection is conducted on the sintered sample, according to a sample detection result and the performance requirement, 0-60 wt% of powder of a relevant grade is added, even mixing is conducted, and after magnetic field orientation forming, isostatic pressing and sintering are conducted on the mixture, a NdFeB finished product is formed. According to the method for reusing the sintered reclaimed NdFeB material, roasting and remelting are not needed, it is only required that rare earth nanometer powder is directly added to reclaimed powder and evenly mixed with the reclaimed powder, and then the product can be prepared according to a conventional technology; in this way, the technology process is simple, task time is shortened, energy consumption is reduced, the amount of used rare earth is reduced by 50% relatively, and the coercivity is increased by 15%-20% relatively; due to the effect of the rare earth nanometer additive, liquid phase mobility is improved during sintering, magnet consistency is improved, the sintering temperature is lowered, and sintering time is shortened.

Description

technical field [0001] The present invention relates to the technical field of recycling sintered NdFeB reclaimed materials that directly add rare earth nano-additives to form grain boundary phases, in particular to the recycling of sintered NdFeB reclaimed materials for preparing high-coercivity NdFeB permanent magnet materials. Use method. Background technique [0002] After decades of mining and excavation of rare earth resources in my country, the amount of resources has become less and less, and the recycling of rare earth elements has become an important means to realize the recycling of rare earth elements. Due to the production process and use factors, the production, application, and disposal of NdFeB permanent magnet materials produce a large amount of recycled materials containing rare earths. In 2013, my country produced 335,000 tons of NdFeB, resulting in more than 67,000 tons of NdFeB waste. Among them, the NdFeB waste that can be recycled in the field of mag...

AI Technical Summary

Problems solved by technology

At present, the existing methods for re-preparing NdFeB permanent magnet materials from NdFeB recycled materials are mainly: (1) Mix NdFeB alloy powder with high rare earth content and waste materials in a certain proportion to prepare NdFeB permanent magnets. Magnetic materials; (2) NdFeB permanent magnet materials are prepared by mixing rare earth hydrides with NdFeB waste in a certain proportion. The above two methods have disadvantages such as large amount of rare earth, complicated process, time-consuming, and power consumption.

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