Preparing method for rare earth holmium alloy and rare earth holmium alloy

Abstract

The invention relates to a preparing method for rare earth holmium alloy and the rare earth holmium alloy. The preparing method for the rare earth holmium alloy is characterized in that a graphite block serves as an anode; a molybdenum or tungsten rod serves as an inert cathode; a molybdenum or tungsten crucible serves as a metal receiver; and a mixture of rare earth oxide and holmium oxide is added into a fluoride fused salt system composed of rare earth fluoride, holmium fluoride and lithium fluoride, direct current is introduced, and the rare earth holmium alloy is obtained through eutectoid electrolysis, wherein mass ratio of the rare earth fluoride, the holmium fluoride and the lithium fluoride in the fluoride fused salt system is (92-60):(5-30):(3-10), the mass percentage of the rare earth oxide and the holmium oxide in the fluoride fused salt system is (99-75):(1-25), and the electrolysis temperature is 1050-1150 DEG C. The preparing method for rare earth holmium alloy has beneficial effects that the rare earth holmium alloy is prepared in the mixed fluoride electrolyte system through eutectoid electrolysis of the mixed oxide, the technology process is simple, cost is low, product components are stable, only CO2 and a small amount of CO are generated in the technology process, pollution to the environment is low, and the preparing method belongs to the environment-friendly technology and is suitable for mass production.

Description

technical field [0001] The invention relates to a preparation method of a rare earth holmium alloy and the rare earth holmium alloy, belonging to the field of rare earth pyrometallurgy. Background technique [0002] The NdFeB sintered magnet prepared by adding holmium has the advantages of high orientation degree; the magnet microstructure is dense, the distribution of Nd-rich phase at the grain boundary of the main phase is relatively uniform; Holmium is added to high-grade NdFeB magnets. [0003] The preparation methods of high melting point rare earth alloys mainly include pair mixing method, thermal reduction method and molten salt electrolysis method. Compared with the first two methods, the molten salt electrolysis method does not need to prepare rare earth metals first, nor does it require high-cost reducing agents and complicated equipment, low cost, uniform composition and easy control, good quality, and easy to achieve continuous production, etc. Many advantages....

AI Technical Summary

Problems solved by technology

[0005] In summary, the above methods for preparing rare earth master alloys are all self-consumable cathode methods. Although this method has the advantages of less investment, low production cost, simple production process, and continuous large-scale production compared with the mixed method, it is also There are large distribution fluctuations in the alloy, and the distribution error is as high as 3%-5%, which affects the consistency of the product

Serious slag formation in the electrolysis process leads to increased production costs, frequent replacement of cathodes during production, and high labor intensity.