Separation method for rare earth elements in monazite

Abstract

The invention discloses a separation method for rare earth elements in monazite. The method comprises the following steps that monazite and a rare earth ore are mixed and ground into ore powder at first, the particle size of the ore powder is -80 microns, batch open-circuit grinding is adopted at first, then simulation-closed-circuit grinding is adopted, and a method adopted for grinding comprisesthe substeps that after selected crude ore is ground for a certain time, products with the particle sizes being equal to or greater than -70 microns are screened out, oversize products are reground,water is added during regrinding according to the oversize product weight and the ore grinding concentration during crude ore grinding, and ore powder is washed after the content of ore powder with the particle size being -50 microns reaches 80% or above; and monazite slag (in kg) is added into a sulfuric acid solution (in L) with the concentration being 0.25-0.5 mol / L according to the proportionof the monazite slag to acid being 1:1-15, a mixture is heated to 40-100 DEG C, stirring is conducted for 5-8 h, cooling, still standing and clarification are conducted for 4-8 h, and a solution containing valuable elements of uranium, thorium and rare earth is obtained through siphoning of a supernatant.

Description

technical field [0001] The invention relates to a rare earth in monazite, in particular to a method for separating rare earth elements in monazite. Background technique [0002] Monazite is one of the main minerals of rare earth metal ore, often containing thorium, zirconium and so on. Monoclinic crystal system, the crystals are in the form of fine plates. Brown-red, yellow or yellow-green, oily luster or glass luster, conchoidal to uneven fracture. Brittle in nature, hardness 5-5.5, density 4.9-5.5g / cm3. It emits bright green fluorescence under ultraviolet light. Because it often contains uranium, thorium, and radium, it has high radioactivity. Monazite contains a large amount of rare earth elements, but it is also very difficult to remove harmful radioactive substances such as uranium. Therefore, a rare earth element in monazite is urgently needed in the industry. Separation method. Contents of the invention [0003] The purpose of the present invention is to provid...

AI Technical Summary

Problems solved by technology

Because it often contains uranium, thorium, and radium, it has high radioactivity. Monazite contains a large amount of rare earth elements, but it is also very difficult to remove harmful radioactive substances such as uranium. Therefore, a rare earth element in monazite is urgently needed in the industry. Separation method