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Method for improving rare earth grade of rare earth ore

A rare earth ore, grade technology, applied in solid separation, flotation and other directions, can solve the problems of difficult to prepare high grade, high recovery rare earth concentrate, low mineral dissociation degree, coarse mineral particle size, etc., to increase the cost , Improve the recovery rate, the effect of high recovery rate

Inactive Publication Date: 2012-01-18
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is difficult to prepare rare earth concentrate with a high recovery rate of more than 65% using the original beneficiation process. The main reason is that the original beneficiation process uses an open-circuit beneficiation operation, and the rare earth medium ore with a higher grade is only mixed together. Carrying out a simple sweeping, the recovery rate will naturally be very low when producing high-grade rare earth concentrates. In addition, the mineral particle size is relatively coarse, and the degree of mineral dissociation is not high, making it difficult to produce high-grade, high-recovery minerals in the original beneficiation process. rate of rare earth concentrate

Method used

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  • Method for improving rare earth grade of rare earth ore

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Experimental program
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Effect test

Embodiment 2

[0030]The Baiyan Obo mixed rare earth concentrate with a rare earth grade of 30.52% and a particle size of -200 mesh, accounting for more than 98%, uses the technology of the present invention to formulate a closed-circuit circulation mineral processing process of one roughing, four beneficiation and one sweeping .

[0031] 1) Rough separation: Add the rare earth concentrate with a rare earth grade of 30.52% and the two medium ores produced by the first stage of beneficiation and the first stage of sweeping into the flotation tank, add water to mix and adjust the pulp to make the pulp quality The concentration is controlled at 65% and stirring is started. The temperature of the pulp is 70°C; while stirring, 0.5kg / t of water glass, LF8#1.8kg / t, 318 is 0.12kg / t, and the pH of the pulp is 8.5. Carry out roughing under certain conditions to obtain roughing concentrate and roughing tailings. The roughing concentrate continues to be first-stage beneficiation, and the roughing tailin...

Embodiment 3

[0038] The Baiyan Obo mixed rare earth concentrate with a rare earth grade of 55.54% and a particle size of -200 mesh accounting for more than 98% uses the technology of the present invention to formulate a process flow for primary roughing, secondary beneficiation and secondary sweeping.

[0039] The amount of reagents added during flotation is calculated by weight ratio: rough selection: water glass 2.6kg / t, H2052.5kg / t, 318 is 0.18kg / t; first fine: water glass 0.9kg / t, H2051.4kg / t , 318 is 0.05kg / t; Erjing: water glass 0.6kg / t, H2051.0 / t, 318 is 0.04kg / t; sweep: water glass 0.4kg / t, H2050.8kg / t, 318 is 0.05 kg / t; second sweep: water glass 0.2kg / t, H2050.7kg / t, 318 is 0.02kg / t; third sweep: water glass 0.4kg / t, H2050.5kg / t, 318 is 0.02kg / t. The mass concentration of the roughing pulp is controlled at 52%, the pulp temperature is 48°C, and the pH of the pulp is 9.6; the mass concentration of the refined pulp is controlled at 55%, the pulp temperature is 56°C, and the pH of th...

Embodiment 4

[0041] The Baiyan Obo mixed rare earth concentrate with a rare earth grade of 50.16% and a particle size of -200 mesh accounting for more than 98% uses the technology of the present invention to formulate a process flow for primary roughing, secondary beneficiation and secondary sweeping.

[0042] The amount of reagents added during flotation is calculated by weight ratio: rough selection: water glass 4.0kg / t, LF8#3.0kg / t, 318 is 0.12kg / t; first fine: water glass 2.0kg / t, LF8#1.8kg / t, 318 is 0.08kg / t; Erjing: water glass 1.5kg / t, LF8#1.5 / t, 318 is 0.05kg / t; sweep: water glass 0.8kg / t, LF8#1.8kg / t, 318 is 0.06kg / t; second sweep: water glass 0.6kg / t, LF8#0.8kg / t, 318 is 0.04kg / t. The mass concentration of the roughing pulp is controlled at 55%, the pulp temperature is 45°C, and the pH of the pulp is 9.5; the mass concentration of the refined pulp is controlled at 55%, the pulp temperature is 40°C, and the pH of the pulp is 9.5; the mass concentration of the sweeping pulp is con...

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Abstract

The invention relates to a method for improving rare earth grade of rare earth ore, and belongs to the technical field of beneficiation technologies. The method is characterized in that: Baotou mixed rare earth ore of which the rare earth ore (REO) grade is between 30 and 60 percent and over 98 percent of which has the grain size of -200 meshes is used as a raw material and subjected to flotation, wherein the flotation comprises three continuous steps of rough flotation, fine flotation and scavenging; a beneficiation technology of closed cycle is adopted in the whole process; produced middling ore is sequentially returned for previous-stage flotation; and high-grade mixed rare earth ore concentrates and tailings with extremely low rare earth grade are only produced. By the method, high-grade rare earth ore concentrate of which the REO grade is more than or equal to 65 percent and the recovery rate is more than or equal to 88 percent can be continuously and stably produced; and the method is simple, effective and high in rare earth recovery rate, does not cause pollution, and effectively solves the awkward situation which cannot be thoroughly improved and caused by raw material problems in the traditional mixed rare earth smelting technology.

Description

technical field [0001] The invention relates to a method for increasing the grade of rare earth ores, in particular to a mineral processing method for preparing high-grade rare earth concentrates from low-grade rare earth concentrates, and belongs to the field of mineral processing. Background technique [0002] At present, the mixed rare earth ores used by Baotou rare earth smelting enterprises are mixed rare earth concentrates with a REO grade of about 50% and a small amount of mixed rare earth concentrates with a REO grade of 58% provided by Baotou Steel Rare Earth Hi-Tech. The grades of the concentrates are not high, and the impurity content is relatively high, so that the concentrated sulfuric acid roasting method and the sodium hydroxide decomposition method can only be used to process the two kinds of mixed rare earth concentrates. [0003] The roasting process of concentrated sulfuric acid and the decomposition method of sodium hydroxide have been used in rare earth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00
Inventor 李梅柳召刚张栋梁高凯王觅堂胡艳宏
Owner INNER MONGOLIA UNIV OF SCI & TECH
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