A method for recovering rare earth from rare earth tailings

Abstract

The invention discloses a method for recovering rare earth from rare earth tailings. Firstly, dolomite is pulverized and then mixed with sulfuric acid in proportion to prepare slurry A; then the slurry A is used to spray the rare earth tailings, and then the leaching solution is collected; Mix the leaching solution and the extractant in proportion, then stand and separate the organic phase and the water phase by layering; then mix the organic phase and hydrochloric acid with a molar concentration of 5.5mol / L in proportion, then leave the organic phase for layering and separation to obtain Solution B containing rare earth chlorides, adding sodium carbonate solution to solution B for precipitation, and filtering the obtained rare earth carbonates after precipitation, the rare earth carbonates can be calcined at high temperature to obtain rare earth oxides. The method of the invention can effectively improve the recovery rate of the rare earth, and the process is simple 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