Method for extracting rare earth from rare earth tailings

Abstract

The invention relates to a method for extracting rare earth from rare earth tailings, and belongs to the technical field of mineral extraction metallurgy. The method comprises the following steps of: (1) mixing the rare earth tailings and a carbon-containing reducing agent uniformly in a certain ratio, and roasting the mixture for 8 to 20 minutes in a microwave roasting oven; (2) performing magnetic separation on the roasted product in a weak magnetic separation tube to separate magnetic iron minerals so that the rare earth minerals are enriched in the tailings; and (3) treating the rare-earth-containing magnetic separation tailings by using a flotation method so as to realize effective extraction of the rare earth. The method has the advantages of short roasting time, low consumption of the reducing agent, energy and a flotation agent, and good flotation effect, can be used for realizing selective reduction of the iron minerals in the reducing process and eliminating environmental pollution caused by the tailings, and is economic and environmentally friendly. The iron mineral impurities such as S, P and the like obtained by the magnetic separation are fewer, the grade of the iron mineral is more than 60 percent, the iron mineral can be used for making iron, the rare earth oxide content of the mineral obtained by primary flotation is 34.12 percent, and the grade of the mineral can reach over 50 percent by concentration.

Description

Technical field: [0001] The invention relates to a method for extracting rare earth from rare-selected tailings, belonging to the technical field of mineral extraction and metallurgy. Background technique [0002] Rare earth is known as the treasure house of high-tech and functional materials in the new century. It is a strategic element for the development of high-tech. It is not only widely used in metallurgy, building materials, chemicals, agriculture, and medicine in traditional industries, but also in machinery, petrochemical, In light spinning. As a functional material, rare earth has become an important basic material in high-tech fields such as information technology, biotechnology, and energy technology. Its special properties relate to almost all functional materials. Rare earth functional materials are the core foundation of the new material field. Functional materials account for more than 80% of the new material research field. They are key materials in high-t...

AI Technical Summary

Problems solved by technology

This process has made a major breakthrough in the extraction of rare earths, but the yield of this process is less than 40%, causing a large amount of rare earth resources to remain in the rare earth tailings and discharged into the tailings dam, resulting in a waste of resources

The above-mentioned method for flotation of rare earths is a very mature process, but the process is long, consumes a lot of power, and costs are high. In addition, a large number of different types of flotation reagents are used, causing serious environmental pollution, and the grade of iron ore obtained by strong magnetic separation is very low. , cannot be recycled well

Images