Method for preparing neodymium iron boron permanent magnet material by using associated mixed rare earth

Abstract

The invention relates to a method for preparing a rare earth permanent magnet material by using Bayan Obo associated mixed rare earth and the prepared permanent magnet material, and belongs to the field of preparation of rare earth permanent magnet materials. The method is characterized in that the Bayan Obo associated mixed rare earth is used as a raw material, a dual-alloy process is used for preparing a main alloy from MM (mixed rare earth) FeB, an auxiliary alloy is PrNd, NdCu, AlCu and the like, and the main alloy and the auxiliary alloy are blended and sintered to form a magnet. The magnetic performance of the prepared permanent magnet material is equivalent to that of a neodymium iron boron permanent magnet material; and however, the associated mixed rare earth is adopted as the raw material, so that the magnet cost can be reduced by more than 30 percent, a part of rare earth extraction and separation steps are reduced, the utilization rate of high-abundance rare earth resources is increased, and pollution is reduced.

Description

technical field [0001] The invention relates to a method for producing a permanent magnet material by mixing rare earths together, and belongs to the field of rare earth permanent magnet material preparation. Background technique [0002] One of the main directions of scientific and technological development in the 21st century is the development and application of new materials, of which rare earth permanent magnet materials account for 39% of the share and have been widely used in aerospace technology, computer equipment, magnetic separators, communication equipment, medical equipment, Various fields such as electric bicycles and electronic toys. my country's production of NdFeB magnetic materials accounts for 80% of the world's total. The main raw material for preparing NdFeB is praseodymium-neodymium alloy, which mainly comes from Baiyun Obo Mine. It is extracted from ore mixed rare earths, among which La and Ce have the highest abundance values, accounting for about 80%...

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Problems solved by technology

my country's production of NdFeB magnetic materials accounts for 80% of the world's total. The main raw material for preparing NdFeB is praseodymium-neodymium alloy, which mainly comes from Baiyun Obo Mine. It is extracted from ore mixed rare earths, among which La and Ce have the highest abundance values, accounting for about 80% of the total rare earths. At the same time as Pr and Nd metals are refined, these metals are also refined at the same time, and the output is very high. However, their prices However, it is far lower than that of Pr, Nd and other metals. The extensive application of praseodymium and neodymium alloys has led to a large backlog of metals such as lanthanum and cerium, polluting the environment

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