Separating and recycling method of rare earth elements

Abstract

The invention relates to a separating and recycling method of rare earth elements, and provides a method for separating and recycling rare earth elements with a high yield which is simpler and more convenient than the prior art. The method is characterized by comprising: a process of adding a specified amount of metal M to a halide mixture containing the abovementioned various rare earth elements; a process of achieving a chemical equilibrium state of a divalent halide generating the abovementioned various rare earth elements and a halide of the abovementioned metal M by heating under atmospheric pressure the mixture to which the abovementioned metal M is added; a process of generating a metal and a trivalent halide of a rare earth element due to disproportionation reaction of a divalent halide of a rear earth element among the abovementioned various rare earth elements by performing vacuum pumping on a system that achieves the abovementioned chemical equilibrium state; and a process of separating the abovementioned mixture into a distilled condensate of the trivalent halide of the abovementioned rare earth element and residues by performing vacuum distillation on the system.

Description

technical field

[0001] The invention relates to a technology for separating and recovering rare earth elements, in particular to a method for separating and recovering rare earth elements from a composition containing multiple rare earth elements. Background technique

[0002] In recent years, recognizing the importance of sustainably protecting the global environment, we have focused on developing industrial systems and transportation systems that minimize the use of fossil fuels. Such environment-friendly systems and products include, for example, wind power generation systems, railway systems, hybrid vehicles, electric vehicles, and energy-saving air conditioners.

[0003] One of the main devices of these environment-friendly systems and products is a high-efficiency rotating electric machine (motor or generator) in which magnets containing rare earth elements (ie, rare earth magnets) are widely used. For example, rare-earth magnets used in rotating electric machines suc...

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