A method for recycling waste HDDR bonded NdFeB permanent magnets

Abstract

The invention discloses a method for recycling waste HDDR bonded NdFeB permanent magnets, which belongs to the technical field of material preparation methods. The technical problem to be solved is to provide a short process flow, low cost and industrialized recovery of waste HDDR bonded NdFeB permanent magnets and its reuse method; After the NdFeB permanent magnet is swelled in the mixed solvent for a period of time, the epoxy resin swollen on the surface of the HDDR magnetic powder is peeled off by water bath stirring and ultrasonic cleaning to achieve the purpose of magnetic powder recovery, and the recovered magnetic powder is combined with commercially available The magnetic powder is mixed and used in a certain proportion to prepare HDDR bonded NdFeB magnets. The invention not only can effectively remove the epoxy resin binder on the surface of the magnetic powder, but also can not destroy the performance of the magnetic powder itself, so that the recovered magnetic powder and the prepared magnet can maintain the performance of the original magnetic powder and the magnet to the greatest extent.

Description

technical field [0001] The patent discloses a method for recycling waste HDDR bonded NdFeB permanent magnets, which belongs to the technical field of material preparation. Background technique [0002] NdFeB permanent magnets are the latest generation of permanent magnets, and they are also the permanent magnets with the highest comprehensive performance known now. Since the appearance of NdFeB permanent magnet materials, it has developed extremely rapidly and has become an indispensable functional material in modern industry. According to different production processes, NdFeB permanent magnets are divided into sintered NdFeB permanent magnets and bonded NdFeB permanent magnets. Generally speaking, although sintered NdFeB permanent magnets have high magnetic properties, the preparation process is complicated, the efficiency is low, the cost is high, and the manufacture of complex magnets is very difficult. Compared with this, bonded NdFeB permanent magnets have a large size...

AI Technical Summary

Problems solved by technology

Generally speaking, although sintered NdFeB permanent magnets have high magnetic properties, the preparation process is complicated, the efficiency is low, the cost is high, and the manufacture of complex magnets is very difficult. Compared with this, bonded NdFeB permanent magnets have a large size High precision, complex shape, uniform and excellent magnetic properties and other comprehensive advantages. Among them, HDDR bonded magnet is a kind of widely used, high-performance anisotropic magnet. In recent years, in response to the needs of high-tech industry development, HDDR bonded neodymium iron The market of boron industry expands extremely fast and develops very broadly, and has been widely used in hard disk drives, optical disk drives, automotive micro-motors, magnetic sensors and other precision motors

[0003] Among them, in the production of HDDR bonded NdFeB permanent magnets, due to the reasons of production equipment, technology and process, the yield rate of HDDR bonded NdFeB permanent magnets is generally about 85%, and the production of HDDR bonded NdFeB permanent magnets The amount of defective products in the process is very large. At the same time, it is inevitable that the magnet will be corroded or oxidized during the use of the magnet. The amount of waste is gradually increasing every year, and the NdFeB waste contains very precious rare earth elements. Therefore, the developed An environmentally friendly and low-cost process route for recycling HDDR bonded NdFeB permanent magnet waste has major economic and social benefits

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