Method for preparing rare earth metal through rotary hearth furnace

Abstract

The invention provides a method for preparing rare earth metal through a rotary hearth furnace, and belongs to the field of rare earth metal reduction. The method for preparing the rare earth metal through the rotary hearth furnace includes the following steps that after rare earth powder, a reducing agent and a binder are mixed, low-temperature preheating, a high-temperature reduction reaction and cooling are sequentially carried out in the rotary hearth furnace, and the rare earth metal is obtained, wherein the rare earth powder comprises one or more of rare earth oxide and rare earth fluoride. After being put in the rotary hearth furnace, a mixture of the rare earth powder, the reducing agent and the binder directly enters a preheating region to be subjected to low-temperature preheating, enters a high-temperature reduction region after low-temperature preheating is finished to start to be subjected to the high-temperature reduction reaction and then enters a cooling region after the high-temperature reduction reaction is finished to be cooled, and the rare earth metal with high purity, a high recovery rate and stable quality is obtained. The three working regions (the preheating region, the high-temperature reduction region and the cooling region) of the rotary hearth furnace are fully utilized, and the treatment effect is greatly superior to that of an existing process.

Description

technical field [0001] The invention relates to the field of rare earth reduction, in particular to a method for preparing rare earth metals using a rotary hearth furnace. Background technique [0002] High melting point rare earth metals (such as Ga, Tb, Dy, Ho, Er, Y, Lu metals, Tb-Dy alloys, etc.) often use metallic calcium as a reducing agent in production, and the raw materials are mainly rare earth fluorides. The resulting reduced slag The main component is CaF 2 , and it contains 5% to 8% of rare earths (REO), which are mainly rare earth metals, rare earth oxides and rare earth fluorides. These reduced slags are often treated as industrial waste or waste, which seriously wastes rare earth resources. [0003] At present, the method commonly used to extract rare earth metals and rare earth oxides from rare earth slag is calcithermal reduction, but there is a technical problem of low rare earth recovery rate. [0004] Invention content: [0005] In view of this, the ...

AI Technical Summary

Problems solved by technology

These reduced slags are often treated as industrial waste or waste, which seriously wastes rare earth resources

[0003] At present, the method commonly used to extract rare earth metals and rare earth oxides from rare earth slag is calcithermal reduction method, but there is a technical problem of low rare earth recovery rate