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 ...

Examples

Embodiment 1

[0025]Rare earth raw ore from a certain place in China is selected, mainly composed of bastnaesite, bastnaesite, monazite, barite, fluorite, calcite, orthoclase, quartz, sodium amphibole, neonite, hornblende , lead manganese ore, biotite and kaolin and other minerals, REO grade is 2.79%. The raw ore is ground to a fineness of -2.00mm, which accounts for 100%, and is classified into three grades of -2.00+0.65mm, -0.65+0.074mm and -0.074mm; -2.00+0.65mm grade products are re-selected by a spiral concentrator , to obtain the spiral concentrator gravity separation concentrate and the spiral concentrator gravity separation tailings; -0.65+0.074mm grain grade products are re-separated by the spiral chute, and the spiral chute gravity separation concentrate and the spiral chute gravity separation tailings are obtained; -0.074mm Grain grade products are magnetically separated under the condition of a magnetic field strength of 1.0~1.5T to obtain strong magnetic separation concentrate ...

Embodiment 2

[0028] The raw ore is the same as in Example 1, and the REO grade is 1.84%. Grinding, classification, gravity separation and magnetic separation are the same as in Example 1. The total yield of spiral concentrator gravity separation concentrate, spiral chute gravity separation concentrate and strong magnetic separation concentrate is 29.67%, and the total recovery rate of rare earths reaches 94.22%; the total yield of discarded tailings is 70.33%; The ore is subjected to shaker re-election respectively to obtain shaker concentrate, shaker middling and shaker tailings; the shaker concentrate and shaker middling of each particle size are combined, and wet high-gradient magnetic separation is performed under the condition of a magnetic field strength of 0.5T , to obtain magnetic separation rare earth concentrate and magnetic separation ore; the REO grade of magnetic separation rare earth concentrate is 65.88%, and the recovery rate is 70.20%. slurry flotation. The regulator use...

Embodiment 3

[0030] The raw ore is the same as in Example 1, and the REO grade is 1.95%. Grinding, classification, gravity separation and magnetic separation are the same as in Example 1. The total yield of spiral concentrator gravity separation concentrate, spiral chute gravity separation concentrate and strong magnetic separation concentrate is 28.88%, and the total recovery rate of rare earths reaches 92.42%; the total yield of discarded tailings is 71.12%; The ore is subjected to shaker gravity separation respectively to obtain shaker concentrate, shaker middling and shaker tailings; the shaker concentrate and shaker middling of each particle size are combined, and the wet high gradient magnetic separation is carried out under the condition of a magnetic field strength of 0.7T , to obtain magnetic separation rare earth concentrate and magnetic separation ore; the REO grade of magnetic separation rare earth concentrate is 65.46%, and the recovery rate is 66.39%. slurry flotation. The ...

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 ...

Examples

Embodiment 1

[0025]Rare earth raw ore from a certain place in China is selected, mainly composed of bastnaesite, bastnaesite, monazite, barite, fluorite, calcite, orthoclase, quartz, sodium amphibole, neonite, hornblende , lead manganese ore, biotite and kaolin and other minerals, REO grade is 2.79%. The raw ore is ground to a fineness of -2.00mm, which accounts for 100%, and is classified into three grades of -2.00+0.65mm, -0.65+0.074mm and -0.074mm; -2.00+0.65mm grade products are re-selected by a spiral concentrator , to obtain the spiral concentrator gravity separation concentrate and the spiral concentrator gravity separation tailings; -0.65+0.074mm grain grade products are re-separated by the spiral chute, and the spiral chute gravity separation concentrate and the spiral chute gravity separation tailings are obtained; -0.074mm Grain grade products are magnetically separated under the condition of a magnetic field strength of 1.0~1.5T to obtain strong magnetic separation concentrate ...

Embodiment 2

[0028] The raw ore is the same as in Example 1, and the REO grade is 1.84%. Grinding, classification, gravity separation and magnetic separation are the same as in Example 1. The total yield of spiral concentrator gravity separation concentrate, spiral chute gravity separation concentrate and strong magnetic separation concentrate is 29.67%, and the total recovery rate of rare earths reaches 94.22%; the total yield of discarded tailings is 70.33%; The ore is subjected to shaker re-election respectively to obtain shaker concentrate, shaker middling and shaker tailings; the shaker concentrate and shaker middling of each particle size are combined, and wet high-gradient magnetic separation is performed under the condition of a magnetic field strength of 0.5T , to obtain magnetic separation rare earth concentrate and magnetic separation ore; the REO grade of magnetic separation rare earth concentrate is 65.88%, and the recovery rate is 70.20%. slurry flotation. The regulator use...

Embodiment 3

[0030] The raw ore is the same as in Example 1, and the REO grade is 1.95%. Grinding, classification, gravity separation and magnetic separation are the same as in Example 1. The total yield of spiral concentrator gravity separation concentrate, spiral chute gravity separation concentrate and strong magnetic separation concentrate is 28.88%, and the total recovery rate of rare earths reaches 92.42%; the total yield of discarded tailings is 71.12%; The ore is subjected to shaker gravity separation respectively to obtain shaker concentrate, shaker middling and shaker tailings; the shaker concentrate and shaker middling of each particle size are combined, and the wet high gradient magnetic separation is carried out under the condition of a magnetic field strength of 0.7T , to obtain magnetic separation rare earth concentrate and magnetic separation ore; the REO grade of magnetic separation rare earth concentrate is 65.46%, and the recovery rate is 66.39%. slurry flotation. The ...