Rare earth alloy material and preparation method thereof

Abstract

The invention discloses a rare earth alloy material and a preparation method thereof. The rare earth alloy material is prepared by mixing rare earth oxide and fused salt, the rare earth oxide is oxidized rare earth, the fused salt is composed of rare earth fluoride and lithium fluoride, and the mass ratio of the oxidized rare earth to the rare earth fluoride to the lithium fluoride is 100: (4-5): (0.5-0.8). The preparation method comprises the following steps that the raw materials are weighed in parts by weight of the rare earth alloy material, and mixed to obtain the rare earth alloy material; and the rare earth alloy material is added into an electrolytic cell, metal tungsten is adopted as a cathode, graphite is adopted as an anode, the current intensity is controlled, direct current is introduced for electrolysis, and the rare earth alloy is obtained after electrolysis is completed. The villiaumite system is relatively stable in process, furnace temperature is small in change and easy to control, and the yield of a single furnace is greatly increased. Moreover, the usage amount of the rare earth fluoride and lithium fluoride is saved, the material ratio is reduced by about 1.2%, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of rare earth alloys and metals, in particular to a rare earth alloy material and a preparation method thereof. Background technique [0002] The preparation of rare earth metals and rare earth alloys is realized through rare earth pyrometallurgical technology. Rare earth pyrometallurgy technology is the application of high temperature, an important thermodynamic condition, to complete the process of reducing rare earth ions into metal state and metal purification. The rare earth pyrometallurgy process begins with the preparation of metals from rare earth compounds. In 1875, W.Hitebrand and T.Norton successfully prepared light rare earth metals such as metal cerium by molten salt electrolysis for the first time, but there were many impurities. In 1907, Treibach, Austria, established the world's first plant using molten salt electrolysis to produce mixed rare earth metals. However, for a period of time ther...

AI Technical Summary

Problems solved by technology

[0003] At present, my country has formed a large-scale production line for mixed rare earth metals, and its dominant process is the chloride system molten salt electrolysis method. Although this process has the characteristics of low cost, it has the following obvious disadvantages: exhaust gas emissions have a greater impact on the environment

The data show that the annual production of rare earth metals in my country is about 5,000 tons, and the chlorine gas emitted by the "chloride electrolysis process" exceeds 1,900 tons, and its impact on the ecological environment cannot be ignored; the furnace temperature in this process changes greatly and is difficult to control; metal products The content of non-rare earth impurities is high; the oxygen content in the rare earth iron alloy prepared by molten salt electrolysis is relatively high. After being added to the ladle, the generated inclusions are easy to cause nozzle blockage, which affects normal tapping

Images