Method for preparing rare earth permanent magnet material by adding liquid-phase nano terbium into magnetic steel scrap

Abstract

The invention discloses a method for preparing a rare earth permanent magnet material by adding liquid-phase nano terbium into magnetic steel scrap. The method comprises the following steps: according to the classifying standard that waste magnet steel with same batch, same model and same contained rare earth elements is classified as the same class, pre-classifying collected waste magnet steel to obtain a pretreated magnet material, and directly carrying out hydrogen crushing and pulverizing on the obtained pretreated magnet material to obtain rare earth hydrogen-crushed magnet powder; then, sampling and analyzing the rare earth hydrogen-crushed magnet powder, adding, according to needs, liquid-phase nano terbium into the rare earth hydrogen-crushed magnet powder to obtain mixed powder; and finally, carrying out static pressing, sintering and annealing to prepare the required rare earth permanent magnet material. According to the method, the problem that alloy ingot obtained by smelting generates segregation due to different melting points of components and artificial operation factors is effectively solved; recycling time is reduced by pre-classifying, and a process step of extracting rare earth element is reduced; and the liquid-phase nano terbium is added into the pre-treated magnet material, so that activation performance of the rare earth permanent magnet material for preparing a fluorescent raw material can be improved, and the fluorescent material under an excited state uniformly emits green light.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a method for preparing rare earth permanent magnet materials by adding liquid-phase nanometer terbium to magnetic steel waste. Background technique [0002] In recent years, with the continuous expansion of the application field of rare earth permanent magnet materials, the demand for raw materials has been increasing. However, due to the high cost of rare earth mining and the strengthening of national regulation, the cost of materials has gradually increased. In the case of excessive price increases, the price tolerance of downstream enterprises is relatively limited, so some downstream enterprises choose to use cheaper ferrite or AlNiCo, SmCo and other materials to replace rare earth in NdFeB magnet raw materials , which brings greater instability to the NdFeB magnet market. At the same time, due to the high brittleness of NdFeB magnet materials a...

AI Technical Summary

Problems solved by technology

Although this process method reuses the waste magnetic steel, its extraction process is complicated, and various process parameters of the recovery container need to be adjusted according to the melting point of different rare earth elements to meet the extraction process requirements of different rare earth elements. equipment put forward higher requirements

At the same time, when processing again, a single rare earth metal oxide will be recovered, and the permanent magnet material required to be prepared will be obtained after various processes such as proportioning smelting, and the permanent magnet produced by this process has many defects. The production process is difficult to control, and there are many human factors, which will affect the quality of mass production

In addition, the permanent magnet materials produced by the existing production process have low actual coercive force, low working temperature stability, and weak corrosion resistance, which have become the main factors limiting their development and application.