Method of recovering rare earth from rare earth tailings

Abstract

The invention discloses a method of recovering rare earth from rare earth tailings. The method comprises the following steps: first, crushing dolomite and then mixing the dolomite with sulfuric acid in proportion to blend slurry A; then spraying the slurry A to the rare earth tailings and then collecting a lixivium; then mixing the lixivium with an extractant in proportion and then leaving the mixture to stand and layer to separate an organic phase and a water phase; then mixing the organic phase with hydrochloric acid, the molar concentration of which is 5.5 mol / L, and then leaving the mixture to stand and layer to separate the organic phase to obtain a solution B containing rare-earth chloride, then adding a sodium carbonate solution into the solution B for precipitation, filtering the precipitate to obtain rare earth carbonate, and calcining the rare earth carbonate at a high temperature to obtain a rare earth oxide. The method can improve the recovery rate of rare earth effectively, and is simple in process and easy to popularize and use.

Description

technical field [0001] The invention belongs to the technical field of mineral processing engineering, and in particular relates to a method for recovering rare earth from rare earth tailings. Background technique [0002] Rare Earth is a general term for seventeen metal elements including lanthanides, scandium and yttrium in the chemical periodic table. There are 250 kinds of rare earth minerals in nature. Rare earth elements are widely used in agriculture, aerospace, electronics manufacturing, transportation and medical industries, etc., and are of great significance to high-tech and economics, and are called "industrial gold". my country is the world's largest rare earth resource country, known as the "rare earth kingdom". my country's proven rare earth resource reserves are 43 million tons, accounting for 43% of the world's total reserves, and my country's annual output of rare earth elements has accounted for To more than 95% of the world's total output. [0003] At pr...

AI Technical Summary

Problems solved by technology

[0003] At present, with the massive development and utilization of rare earth mineral resources, the ore is increasingly scarce, and at the same time, the utilization efficiency of mine tailings is low, resulting in the accumulation of tailings and occupying a large amount of land, and also causing great harm to the ecological environment.

Existing tailings reuse often adopts flotation method, and rare earth minerals are obtained after multiple flotation of rare earth tailings, but the multiple flotation steps are complicated, and a large amount of flotation reagents are required to ensure the recovery rate of rare earths