Rare earth ore beneficiation method

Abstract

The invention relates to a rare earth ore beneficiation method which is characterized in that grading is carried out after ore grinding is carried out on raw ore; reselection is carried out on coarse fractions to obtain gravity concentrates and tailings; magnetic separation is carried out on fine fractions to obtain strong-magnetic separation concentrates and tailings; reselection is respectively carried out on gravity concentrates and strong-magnetic separation concentrates which are different in fraction through a table to obtain table concentrates, table middlings and table tailings; the table concentrates and the table middlings which are different in fraction are mixed, and wet-type high-gradient magnetic separation is carried out to obtain magnetic separation rare earth ore concentrates and magnetic separation middlings; the magnetic separation middlings and the table tailings are mixed, closed-loop flotation including primary rough concentration, secondary scavenging and secondary fine selection is carried out after ore regrinding is carried out, the middlings are returned in proper sequence, and flotation rare earth ore concentrates and flotation tailings are obtained. The magnetic separation rare earth ore concentrates and the flotation rare earth ore concentrates are total rare earth ore concentrates, the REO grade is higher than 65%, and the total recovery rate ranges from 80% to 87%. The rare earth ore beneficiation method is high in grading efficiency, small in occupied area, continuous in production and low in cost, full-wet dust-free operation is achieved, and industrialization is easy to achieve. The rare earth ore beneficiation method is suitable for beneficiation of light rare earth ore existing in the bastnaesite or parisite mode.

Description

technical field [0001] The invention relates to a beneficiation method, in particular to a beneficiation method of low-grade rare earth ores containing bastnaesite and bastnaesite. Background technique [0002] Rare earth elements are the collective name of 17 elements such as lanthanides, scandium and yttrium, and are widely used in new energy, new materials and cutting-edge technologies, such as high-strength permanent magnets, petroleum refining catalysts, glass and metal additives, and electronics. Display phosphors, etc., have the reputation of "industrial monosodium glutamate" and are important non-renewable strategic resources. So far, there are about 250 kinds of rare earth minerals discovered in the world, but now the minerals used for industrial extraction of rare earth elements mainly include bastnaesite, monazite, xenotime and weathering crust leaching ore. [0003] The famous bastnaesite rare earth deposits in the world include the Mountain Pass deposit in the ...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the strong magnetic separator equipment, the coarsest selected particle size is 1.0mm

However, when dealing with low-grade ores with coarse particle size embedded in rare earth minerals, not only the cost of grinding is high, resulting in poor economic efficiency of the entire production process, but also unavoidable over-grinding of rare earth minerals, resulting in poor separation effect