Regeneration method of P507 organic-phase emulsified mixture for extracting and separating rare earth

Abstract

The invention discloses a regeneration method of a P507 organic-phase emulsified mixture for extracting and separating rare earth. The method concretely comprises the following steps: sequentially adding a P507 organic-phase emulsified mixture and a 4mol / L-8mol / L sodium hydroxide solution at 90-100 DEG C into a reaction pan; stirring and reacting for 5-10 minutes, and then standing and layering, wherein the upper layer is a clear organic phase, the middle layer is a transparent water phase, and the lower layer is a sediment containing rare earth hydrate, the water phase and the sediment are discharged from the bottom of the reaction pan, rare earth is recovered by an oxalate precipitation method after the water phase and the sediment are filtered, washed and dissolved by hydrochloric acid, the yield of the rare earth is about 95%, and the organic phase of the upper layer is a regenerated P507 organic phase, and can be directly applied to extraction and separation of the rare earth. The recovery rate of the P507 organic phase is high, and is up to 99-100%.

Description

technical field [0001] The invention relates to a regeneration method for P507 extraction and separation of rare earth organic phase emulsions, in particular to a regeneration method for treating P507 organic phase emulsions with hot sodium hydroxide solution, and belongs to the technical field of solvent extraction. Background technique [0002] P507 (2-ethylhexylphosphonic acid mono-2-ethylhexyl ester) is the most important extractant for industrial separation of mixed rare earth raw materials. In the process of P507 extraction and separation of rare earth elements, it is inevitable to encounter the problem of emulsification of the organic phase. In the rare earth extraction and separation production line, it is often necessary to remove the organic phase emulsion (also known as the emulsified three-phase). When the emulsification is serious, the production must be stopped to clean the tank. P507 organic phase emulsion usually contains rare earth, iron, silicon, calcium, ...

AI Technical Summary

Problems solved by technology

Obviously, discarding the P507 organic phase emulsion in nature not only wastes precious rare earth resources and the more expensive extractant P507, but also pollutes the environment.