A preparation process for full-cycle recycling of NdFeB waste magnetic steel to produce new permanent magnets
A waste magnet and preparation technology, which is applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of complex smelting and throwing process, high cost, and inability to play the role of waste magnet, to achieve Resource saving, performance improvement, good recycling effect
Active Publication Date: 2021-07-20
安徽吉华新材料有限公司
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Problems solved by technology
Existing recycling of waste magnets mostly adopts the method of chemical extraction, extraction and separation of elements, and NdFeB waste plus new raw materials for recycling. Chemical methods inevitably use chemical reagents and acids, which are not conducive to environmental protection. Adding new raw materials to NdFeB waste To prepare new magnets by mixing strips and strips, it is necessary to re-test the composition of waste materials, adjust the composition of strips according to the composition of waste materials, and the process of smelting strips is complicated, the cost is high, and most of them cannot play the role of the elements in the waste magnets
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[0025] A preparation process for producing new permanent magnets through full-cycle recycling of NdFeB waste magnets, the preparation process comprising the following steps:
[0026] (1) Waste treatment: Put the magnetized waste (38M electric vehicle motor magnet steel scrapped and dismantled on the market) into a vacuum demagnetization furnace for demagnetization. The demagnetization temperature is 570°C. The motor magnet steel waste is directly put into the vibrating screen for vibration grinding for 40 minutes, and nitrogen protection is connected to the whole process of vibration cleaning;
[0027](2) Hydrogen crushing: Put the cleaned waste 38M waste into the rotary hydrogen explosion furnace reactor for vacuum treatment. When the vacuum degree reaches below 5E-1Pa, fill it with argon to normal pressure and then vacuumize it and fill it with high-purity hydrogen. (purity 99.99%), saturated hydrogen absorption, stop hydrogen absorption when the pressure loss of hydrogen ab...
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Abstract
The invention provides a preparation process for producing new permanent magnets through full-cycle recycling of NdFeB waste magnetic steel, and relates to the field of rare earth permanent magnet materials of rare earth functional materials. The preparation process for producing new permanent magnets through the full-cycle recycling of NdFeB waste magnets includes: waste treatment, hydrogen crushing, material mixing, jet milling, powder mixing cold treatment, magnetic field forming, cold isostatic pressing, microwave sintering, Magnetic field heat treatment and other steps. The invention overcomes the deficiencies of the prior art, and not only restores the performance of the waste 38M magnetic steel, but also further improves the quality of the product Performance, improve the economic benefits of NdFeB magnet production.
Description
technical field [0001] The invention relates to the field of rare earth permanent magnet materials of rare earth functional materials, in particular to a preparation process for producing new permanent magnets through full-cycle recycling of NdFeB waste magnets. Background technique [0002] Permanent magnet materials, especially rare earth RE-Fe-B series permanent magnet materials, are a class of permanent magnet materials with the best comprehensive performance at present, and have become an indispensable and important material basis in modern industry and science and technology. Among them, sintered NdFeB permanent magnet materials have been rapidly industrialized due to their excellent cost performance, and are widely used in various high-tech fields such as computer hard disk drives, hard disk voice coil motors, motors, generators, nuclear magnetic resonance instruments, audio, and communication equipment. . Some of the application areas such as hard disks and nuclear ...
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IPC IPC(8): H01F41/02H01F13/00H01F1/057
CPCH01F1/0576H01F1/0577H01F13/006H01F41/0253H01F41/0266
Inventor 熊吉磊陈敏陈吉华熊辉
Owner 安徽吉华新材料有限公司