Rare earth permanent magnet prepared from bayan obo accompany raw ore misch metal and preparation method of rare earth permanent magnet

Abstract

The invention relates to a rare earth permanent magnet prepared from a bayan obo accompany raw ore misch metal and a preparation method of the rare earth permanent magnet. The rare earth permanent magnet is prepared from the components as shown in the following equation: (PrNd)x(MM)y(Fe(1-a)Aa)zB, wherein x+y is greater than or equal to 2 and is less than or equal to 2.5, z is greater than or equal to 11 and less than or equal to 14, and MM is bayan obo accompany raw ore misch metal. The rare earth permanent magnet can be prepared by using a powder metallurgy process and a rapid-quenching hot-press thermal deformation process. The bayan obo accompany raw ore misch metal is adopted to develop a novel resource-saving rare earth permanent magnet for replacing a conventional rare earth permanent magnet, the rare earth permanent magnet provided by the invention has the advantages of low price and environment pollution reduction, the magnetic energy product of the prepared rare earth permanent magnet ranges from 25-45 MGOe, and the blank of the application range of ferrite and SmCo rare earth permanent magnets can be well made up.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and relates to a rare earth permanent magnet made of mixed rare earths associated with raw ore in Baiyun Obo and a preparation method thereof, in particular to a mixed rare earth-praseodymium neodymium-iron-boron double hard magnetic alloy magnet and its Preparation. Background technique [0002] Rare earth permanent magnet materials are indispensable materials in the fields of national security, information, energy, and environmental protection. China is the largest producer of rare earth permanent magnet materials. According to industry analysis related reports, the market penetration rate of medium and low-grade NdFeB permanent magnets in traditional applications (speakers, magnetic separation, permanent magnet motors, VCM, MRI, etc.) has reached more than 50%, and the demand is in a period of stable growth, with an annual growth rate of 5%. %-10% or so. China i...

AI Technical Summary

Problems solved by technology

Traditional rare earth permanent magnets consume a large amount of low-abundance, resource-scarce praseodymium, neodymium, samarium, dysprosium, and terbium rare earth elements, while high-abundance lanthanum and cerium elements have not been effectively utilized and have a large backlog, resulting in unbalanced utilization of rare earth resources

Moreover, the original process did not consider the co-occurrence characteristics of rare earth elements, excessively pursued the purity of raw materials, and caused serious ecological environmental pollution and waste of resources in the process of rare earth mining-selection-separation purification-smelting