A kind of rare earth permanent magnet made from mixed rare earth of Baiyun Obo co-associated raw ore and its preparation method

Abstract

The present invention relates to a rare earth permanent magnet made of mixed rare earth from Baiyun Obo co-associated raw ore and a preparation method thereof. The composition of the rare earth permanent magnet is shown in the following formula: (PrNd)x(MM)y(Fe1-aAa)zB , 2≤x+y≤2.5, 11≤z≤14, MM is Baiyan Obo co-associated raw ore mixed rare earth. The rare earth permanent magnet can be realized by powder metallurgy process, rapid quenching-hot pressing and heat deformation process. The present invention proposes to develop a new type of resource-saving rare earth permanent magnet by using the mixed rare earth of Baiyun Obo raw ore to replace the traditional rare earth permanent magnet, which has the advantages of low price and reduced environmental pollution. The scope of application of ferrite and SmCo rare earth permanent magnets is blank.

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