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Ore dressing method for low-grade rare earth ore

A beneficiation method and rare earth ore technology, applied in chemical instruments and methods, wet separation, solid separation, etc., to achieve the effect of reducing the amount of processing

Inactive Publication Date: 2013-11-13
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a low-cost, green and efficient mineral processing method to solve the problem of mineral processing and recovery of low-grade rare earth ores with a rare earth content of less than 0.1%.

Method used

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  • Ore dressing method for low-grade rare earth ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The rare earth content of a rare earth mine in Xinjiang is 0.099%; Grinding: the raw ore is crushed and ground to -0.074mm, accounting for 84.87%; wet magnetic separation: the magnetic field strength is 800MT, and the magnetic separation tailings with a yield of 95.36% are thrown away; gravity separation: Magnetic separation rare earth ore undergoes re-election on a shaking table, throwing away gravity-separated tailings with a yield of 4.50%; dry magnetic separation: re-separated rare-earth ore undergoes dry magnetic separation with a magnetic field strength of 450MT and a removal rate of 0.04 % of gangue minerals to obtain rare earth concentrates.

[0014] The results of Example 1 are shown in Table 1.

[0015] The result of table 1 embodiment 1

[0016] name Yield(%) Rare earth grade (%) Rare earth recovery rate (%) Rare earth concentrate 0.10 50.59 51.00 gangue minerals 0.04 1.42 0.57 Gravity tailings 4.50 0.22 9.98 Magn...

Embodiment 2

[0018] The rare earth content of a rare earth mine in Jiangxi is 0.081%; Grinding: The original ore is crushed and ground to -0.074mm, accounting for 85.33%; Wet magnetic separation: The magnetic field strength is 1000MT, and the magnetic separation tailings with a yield of 92.89% are discarded; Gravity election: Magnetic separation rare earth ore undergoes re-election on a shaking table, throwing away the gravity-separated tailings with a yield of 6.97%; dry magnetic separation: gravity-separated rare-earth ore undergoes dry magnetic separation with a magnetic field strength of 500MT, and the removal rate is 0.053 % of gangue minerals to obtain rare earth concentrates.

[0019] The results of Example 2 are shown in Table 2.

[0020] The result of table 2 embodiment 2

[0021] name Yield(%) Rare earth grade (%) Rare earth recovery rate (%) Rare earth concentrate 0.087 50.24 50.58 gangue minerals 0.053 1.26 0.77 Gravity tailings 6.97 0.19...

Embodiment 3

[0023] The rare earth content of a rare earth mine in Fujian is 0.079%; Grinding: The raw ore is crushed and ground to -0.074mm, accounting for 84.61%; Wet magnetic separation: The magnetic field strength is 950MT, and the magnetic separation tailings with a yield of 92.31% are thrown away; Gravity separation: Magnetic separation rare earth ore undergoes re-election on a shaking table, throwing away the gravity-separated tailings with a yield of 7.55%; dry magnetic separation: gravity-separated rare-earth ore undergoes dry magnetic separation with a magnetic field strength of 400MT, and the removal rate is 0.069 % of gangue minerals to obtain rare earth concentrates.

[0024] The results of Example 3 are shown in Table 3.

[0025] The result of table 3 embodiment 3

[0026] name Yield(%) Rare earth grade (%) Rare earth recovery rate (%) Rare earth concentrate 0.071 51.37 46.09 gangue minerals 0.069 1.14 0.99 Gravity tailings 7.55 0.2 19...

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Abstract

The invention discloses an ore dressing method for low-grade rare earth ore. The method is characterized by comprising the following steps: (1) ore grinding: crushing and grinding raw ore till -0.074 millimeter to obtain ore accounting for about 85 percent; (2) wet magnetic separation: performing magnetic separation under the magnetic field strength of 800-1000MT to obtain magnetic separation rare earth ore and magnetic separation tailings; (3) re-separation: re-separating the magnetic separation rare earth ore to obtain re-separated rare earth ore and re-separated tailings; and (4) dry magnetic separation: filtering and drying the re-separated rare earth ore, and performing magnetic separation under the magnetic field strength of 400-500MT to obtain gangue minerals and rare earth ore concentrate. The method belongs to physical mineral separation, does not involve addition of any chemical additive, and is a low-cost, environment-friendly and efficient ore dressing method. The method is suitable for raw ore of which the rare earth grade is lower than 0.1 percent.

Description

technical field [0001] The invention relates to a beneficiation method of low-grade rare earth ore. Background technique [0002] Rare earth is known as the "treasure house" of new materials. It is a group of elements that are most concerned by scientists at home and abroad, especially material experts. It is listed by the relevant government departments of the United States, Japan and other countries as key elements for the development of high-tech industries. There are a total of 17 rare earth elements, which are widely used in fluorescence, permanent magnet materials, special glass, precision ceramics, superconducting materials, national defense and cutting-edge technology fields. [0003] China is the country with the richest rare earth resources in the world. 98% of the country's total rare earth resources are distributed in Inner Mongolia, Jiangxi, Guangdong, Sichuan, Shandong and other regions, forming a distribution pattern of north, south, east and west, and has a c...

Claims

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Application Information

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IPC IPC(8): B03B7/00
Inventor 高玉德邱显扬韩兆元王国生徐晓萍万丽张凤华
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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