Recycling technique for galvanized sintered NdFeB wastes

Abstract

The invention discloses a recycling technique for galvanized sintered NdFeB wastes. The recycling technique comprises the following steps: performing multi-level breaking, hydrogen decrepitation, screening and airflow grinding on the sintered NdFeB wastes with a galvanized layer in turn, thereby acquiring the fine grains with few impurities and particle size being 3-5 microns; uniformly mixing the prepared auxiliary alloy with the fine grains made from the galvanized wastes at a certain ratio, wherein the auxiliary alloy can be the alloy powder containing one or more of praseodymium neodymium, holmium iron, gadolinium iron and dysprosium iron, and the proportion of the auxiliary alloy is 10-50%; performing the processes of forming, sintering, and the like, on the magnetic powder, thereby acquiring the required magnet. According to the recycling technique, the galvanized sintered NdFeB wastes are directly utilized to prepare the NdFeB products, and the rare earth separation is no longer performed, so that the environmental pollution is reduced and the manufacturing cost is lowered. According to the recycling technique, the galvanized sintered NdFeB wastes are subjected to multi-level breaking and hydrogen decrepitation and then screening and impurity-cleaning, so that the galvanized coating tablets and impurities in the electroplated wastes are extremely removed, and the basis for manufacturing the products at different grades is established.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a recycling process of galvanized sintered NdFeB waste. Background technique [0002] NdFeB rare earth iron-based permanent magnet materials are widely used in various fields of modern science and technology because of their good comprehensive magnetic properties. However, NdFeB magnets are easily corroded in the usual environment, which will lead to serious deterioration of the magnetic properties of the magnet and failure of the structure, which has become a major obstacle to the development of the industry. [0003] The coating protection method is the most important method to improve the corrosion resistance of NdFeB magnets, and it is also the most effective means for practical application. The anti-corrosion layer coated on the outside of the magnet is mainly a metal coating represented by Ni, Zn, and Al and an epoxy resin polymer coating. The plating methods include elec...

AI Technical Summary

Problems solved by technology

This will cause serious environmental pollution and greatly increase manufacturing costs, but also cause a large amount of rare earth loss