Beneficiation method of rare earth ore

Abstract

The invention discloses a beneficiation method of rare earth ore. The beneficiation method comprises the steps that crude ore is subjected to crushing and ore grinding till the crude ore with the fineness being -0.076 mm accounting for 50% or above, low intensity magnetic separation is carried out to remove strongly magnetic minerals, then superconducting magnetic separation rougher flotation is carried out to obtain rare earth rough concentrates, the rare earth rough concentrates are ground till the rare earth rough concentrates with the fineness being -0.076 mm accounting for 80% or above, conventional flotation work is carried out, and final rare earth ore concentrates are obtained; conventional flotation work includes the processes of one-section rougher flotation, two-section concentration and two-section scavenging; according to low intensity magnetic separation, the magnetic field intensity ranges from 0.1 T to 0.5 T, and the magnetic field force is (3-15)*10<5>kA<2> / m<2>; and according to superconducting magnetic separation, the magnetic field intensity is larger than 0.5 T, and the magnetic field force is larger than 3*10<7>kA<2> / m<2>. According to the method, the high-grade rare earth rough concentrates can be obtained through superconducting magnetic separation, a large quantity of tailings can be thrown out, the grading efficiency is high, the two-section ball grinding ore feeding quantity is greatly reduced, grinding and selecting energy consumption is reduced, the rare earth grade of the obtained rare earth ore concentrates is improved, and the recovery rate is high.

Description

technical field [0001] The invention relates to the technical field of rare earth ore beneficiation, in particular to a rare earth ore beneficiation method. Background technique [0002] The world reserves of rare earth resources are huge, about 57 million tons in terms of rare earth oxides, of which yttrium oxide is about 35,000 tons, accounting for 0.06% of the total reserves; in terms of mineral types, bastnaesite accounts for 50.6%, monazite and xenotime account for 46.4%, others accounted for 3.0%. There are about 150 kinds of rare earth minerals known in the world, and there are more than 250 kinds of minerals containing rare earth elements, but there are only more than 10 kinds of rare earth minerals that can be used by the metallurgical industry, such as bastnaesite, monazite, xenotime , fractalite, brown yttrium niobium ore, bastnasite, yttrium yttrium ore, allanite, yttrium fluorite, black rare gold ore, siliconite, etc., among which the main industrial minerals a...

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned rare earth beneficiation process has the disadvantages of low recovery rate of rare earth concentrate, high beneficiation cost, complex process, large fluctuation of technical indicators, poor stability, etc.

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