Method for complex-precipitation aluminum removal in rare earth solution

Abstract

The invention relates to a production method for removing aluminum (Al<3+>) and purifying rare earth from a rare earth solution and belongs to the field of rare earth hydrometallurgy and chemistry. The method comprises the following steps that (1) raw materials are prepared, the pH value of the rare earth solution is smaller than or equal to 3, the concentration of REO is 20 g / L-300 g / L, and the concentration of Al2O3 is 0.8 g / L-3 g / L; a complex precipitant is one of hydroxyquinoline or ramifications of the hydroxyquinoline; and (2) precipitation aluminum removal is conducted, the complex precipitant is added into the rare earth solution prepared in the step (1), stirring is conducted at the constant temperature, a reaction is conducted, the pH value of the solution is adjusted, precipitation is conducted, and aluminum-removed rare earth liquid is obtained through vacuum filtration and separation. According to the production method, the rare earth solution containing a large quantity of aluminum ions is treated through the hydroxyquinoline or the ramifications of the hydroxyquinoline, the aluminum ions can be removed from the rare earth solution, the effect that the aluminum ion removal rate reaches 90% or above is guaranteed, the rare earth loss ratio is not larger than 5%, and the aluminum ion concentration in the rare earth solution is greatly decreased.

Description

technical field [0001] The present invention relates to the removal of aluminum (Al 3+ ) The production method of purifying rare earth belongs to the field of rare earth hydrometallurgy and chemistry. Background technique [0002] Rare earth elements are known as "industrial vitamins". They are widely used in modern industry and play a vital role. Rare earth elements occupy an indispensable position in the fields of petroleum, chemical industry, metallurgy, ceramics, glass, and permanent magnet materials. Rare earth minerals are a very important national strategic resource. Ion-adsorption rare earth minerals are a special kind of rare earth mineral resources. The rare earth elements in the minerals are adsorbed on the surface of clay minerals in the form of ions. During the leaching process of rare earth ions using a leaching agent, the heteroions adsorbed on the surface of clay minerals, such as Al 3+ , Ca 2+ , Fe 3+ etc. will be replaced by the leaching agent from the ...

AI Technical Summary

Problems solved by technology

This method requires precise control and stability of the pH value during the process. Once the pH value fluctuates, emulsification will occur and the extraction process cannot be carried out smoothly. Therefore, the operation cost of this method is relatively high.