A method for separating rare earth and aluminum from ionic rare earth mine leachate

Abstract

The invention discloses a method for separating rare earth and aluminum from ionic rare earth mine leaching liquid. The mine leaching liquid obtained by ammonium sulfate in-situ leaching is precipitated by adding excess carbonate; the obtained precipitate is mixed with alkali and roasted, and the The aluminum-containing impurities are transformed into sodium metaaluminate; the roasted slag sample is washed with hot water, sodium metaaluminate is dissolved in water and enters the solution, and the remaining slag phase is rare earth oxide. In this preparation method, the rare earth and aluminum-containing impurities are co-precipitated, and then alkali-roasted to transform the aluminum-containing impurities, and then the rare earth oxide is obtained by washing and removing aluminum, which has the advantages of short process, simple operation, high rare earth recovery rate, and high aluminum removal efficiency. advantage.

Description

A method for separating rare earth and aluminum from ionic rare earth mine leachate technical field The present invention relates to non-ferrous metal metallurgy technical field, relate in particular to a kind of separation from ionic rare earth mine leaching solution. A method for separating rare earths and aluminum. Background technique The medium and heavy rare earth elements that are rich in ionic rare earth ore are widely used because of their excellent optical, electrical, magnetic and other characteristics. It is a strategic resource of my country in the fields of national defense and military industry, new materials, aerospace and other fields. At present, adopt in-situ leaching technology to process ionic rare earth ore gained leaching solution, rare earth (in REO) content can be above 1g / L, while Al 3+ The concentration also reaches about 0.5g / L. During the precipitation and enrichment of rare earths, due to rare earth and The pH of the aluminum preci...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for separating rare earth and aluminum from the leaching solution of ionic rare earth mines, aiming to solve the technical problems of large loss of rare earth and high residual aluminum in the existing leaching solution of ionic rare earth mines.