Method for preparing Dy-Fe alloy through oxide molten salt electrolysis

Abstract

The invention discloses a method for preparing a Dy-Fe alloy by electrolyzing an oxide molten salt. The method comprises the following steps of: adding a mixture of Dy2O3 and Fe2O3 into a fluoride molten salt electrolyte system; and electrolyzing to prepare the Dy-Fe alloy. In the invention, a tungsten rod is utilized as a cathode, and element Fe is obtained from electrolyzing ferric oxide, thus the distribution of Dy and Fe in the produced Dy-Fe alloy is strong in controllability, and the error is less than 1%. As a high-density cathode current is utilized, during the electrolysis production process, the slagging amount is greatly reduced, the yield is improved, and the production cost is reduced; no self-consumption ferric cathode is utilized, thereby reducing the labor intensity of frequently replacing the ferric cathode; and a 10000A-30000A large-scale electrolysis stove can be used for production, thereby greatly improving alloy consistency.

Description

technical field [0001] The invention relates to a method for preparing dysprosium-iron alloy by electrolysis of oxide molten salt, belonging to the field of rare earth metallurgy. technical background [0002] In the manufacture of the third-generation rare earth permanent magnet "NdFeB" magnet known as the king of magnetism, a large amount of rare earth metals such as praseodymium, neodymium, dysprosium, and terbium are used. In order to reduce production costs, replacing the rare earth metals praseodymium, neodymium, and dysprosium with praseodymium-neodymium alloys and dysprosium-iron alloys with low production costs and low melting points has become the main practice of most "NdFeB" enterprises. Praseodymium neodymium alloy and dysprosium iron alloy have also become the leading products of rare earth metal production enterprises. [0003] At present, the production method of dysprosium-iron alloy is mainly completed by molten salt electrolysis method and smelting infilt...

AI Technical Summary

Problems solved by technology

But at the same time, there are also the following defects: the distribution of dysprosium and iron in the alloy fluctuates greatly, it is difficult to control, and the distribution error is as high as 3%-5%, which affects the consistency of the product

The slag formation in the electrolysis process of dysprosium is serious, which affects the further reduction of production cost

And it cannot be produced in large electrolytic furnaces such as 10000A, and the product consistency is extremely poor

Moreover, since the iron cathode is self-consumable and the cathode is frequently replaced during production, the labor intensity of the employees increases