Method for preparing rare-earth dysprosium alloy by molten salt electrolysis

Abstract

The invention relates to a method for preparing a rare-earth dysprosium alloy by molten salt electrolysis. The method is characterized by comprising the following steps: adding a mixture of a rare earth oxide and a dysprosium oxide as an electrolytic material in a fluoride molten salt system to carry out electrolysis production, wherein the fluoride molten salt system adopts a ternary system of 90-80% of rare earth fluoride, 7-10% of dysprosium fluoride and 3-10% of lithium fluoride by weight percent; the weight percent ratio of the rare earth oxide to the dysprosium oxide in the raw material mixture is (95-80):(5-20); and the electrolyzing temperature is 1030+ / -30 DEG C; carrying out electrolysis by adopting a plug or bottom cathode method when the cathode current density is 6.0+ / -2.0A / cm<2>, the anode current density is 1.3+ / -1.0A / cm<2> and the cell voltage is 5-10V; and depositing the rare-earth dysprosium alloy near the cathode. The method has the advantages that the problems of complicated process, serious environmental pollution, high production cost and the like of the related technique at present are effectively overcome, the prepared alloy ingredient is even, and the method is suitable for production of a large electrolytic cell of over 10,000A.

Description

technical field [0001] The invention relates to a method for preparing a rare earth dysprosium alloy by molten salt electrolysis, belonging to the field of rare earth metallurgy. Background technique [0002] Due to its special physical and chemical properties, dysprosium is widely used in many functional materials, especially in the NdFeB permanent magnet material industry. In order to improve the magnetic properties of products, dysprosium must be used as an additive, and its dosage accounts for about The dosage of NdFeB is 3%, and the application prospect is very broad. [0003] During the smelting process of the above materials, according to the smelting principle, the additive elements are almost added in the form of alloys, which can not only lower the melting point, increase the melting speed, but also reduce costs and reduce unnecessary loss of alloys. [0004] The existing dysprosium metal production process is the vacuum calcithermic reduction meth...

AI Technical Summary

Problems solved by technology

It solves the key problems of unstable dysprosium content, complex process and high cost caused by environmental pollution in the process of preparing dysprosium alloy