Oxide and salt melt electrolyzing process of producing cell-level mixed RF metals

Abstract

The present invention is oxide and salt melt electrolyzing process of producing cell-level mixed RE metals. Mixed RE oxide formed with RE chloride and through carbon deposition and ignition is mixed with molten salt, and the mixture is electrolyzed to obtain cell-level mixed RE metals. The present invention is green environment-protecting RE metal producing technology, has no adverse effect of producing great amount of chloride to affect environment.

Description

Technical field: [0001] The invention relates to a process for producing mixed rare earth metals, in particular to a process for producing battery grade mixed rare earth metals by electrolysis of oxide molten salt. Background technique: [0002] my country's existing production line for large-scale production of mixed rare earth metals is formed, 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: [0003] 1. Exhaust gas emissions have a greater impact on the environment. 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. [0004] 2. This process must install a huge chlorine gas recovery and disposal system, which requires a lot of investment and covers ...

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Problems solved by technology

[0004] 2. This process must install a huge chlorine gas recovery and disposal system, which requires a lot of investment and covers a large area, which will undoubtedly increase the operating costs of electrolysis production

[0005] 3. The content of non-rare earth impurities in metal products is high. The mixed rare earth metals produced by this process are mainly used as additives in the steel industry, and it is difficult to meet the requirements of modern technology applied to battery production.