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A beneficiation method for recovering iron, rare earth, fluorite and niobium from iron tailings of associated polymetallic minerals

A technology of iron tailings and polymetallics, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of complex mineral types, waste of resources, difficult ore separation, etc., to reduce the amount of fluorite flotation, The effect of reducing the amount of reducing agent and increasing the quality of concentrate

Active Publication Date: 2020-03-06
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the utilization of Baiyan Obo Iron Mine is limited to the recovery of iron and rare earths, and the recovery rate of iron is only about 75%, and the recovery rate of rare earths is less than 30%. Other minerals are regarded as gangue piles and stored in tailings ponds. cause waste of resources
[0003] Baiyan Obo Iron Mine, as a polymetallic (associated) ore, has become a representative of refractory minerals due to its complex mineral types and complex metasomatism. The useful minerals and gangue minerals in its tailings have relatively high magnetic properties and specific gravity buoyancy. Therefore, it brings great difficulties to the research on the comprehensive utilization of Baiyun Obo Iron Mine.
Baiyun Obo Iron Mine currently adopts the "weak magnetic-strong magnetic-flotation" process to recover iron and rare earths. In view of the low recovery rate of weak magnetic iron minerals and rare earth minerals in the tailings of strong magnetic separation during production operations
Part of the weak magnetic iron minerals and most of the rare earth minerals enter the tailings, and because the rare earth flotation tailings slurry contains a large amount of chemicals, which affects the further separation of minerals such as fluorite, so the iron, rare earth, fluorite, niobium in the tailings Comprehensive utilization faces many difficulties

Method used

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  • A beneficiation method for recovering iron, rare earth, fluorite and niobium from iron tailings of associated polymetallic minerals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, the tailings in the Baiyun Obo tailings pond are used as raw materials, in which the grade of iron (TFe) is 18.77%, and the grade of fluorite (CaF 2 ) grade is 20.62%, rare earth (REO) grade is 7.02%. Utilize the method of the present invention to finally obtain the iron concentrate with an iron grade of 65.89% and a recovery rate of 88.75%; the rare earth concentrate with a rare earth grade of 68.54% and a recovery rate of 82.12%; the fluorite grade of 95.21% and a recovery rate of 81.53% The fluorspar concentrate specifically comprises the following steps:

[0038] (1) Feed the Baiyan Obo tailings into a wet permanent magnetic drum magnetic separator with a magnetic field strength of 0.25T to obtain weak magnetic pre-enrichment concentrates and weak magnetic pre-enrichment tailings.

[0039] (2) Feeding the weak magnetic pre-enrichment tailings into a vertical ring wet high-strength magnetic separator with a magnetic field strength of 0.65T to obtain...

Embodiment 2

[0047] In this example, the tailings in the Baiyun Obo tailings pond are used as raw materials, in which the grade of iron (TFe) is 16.10%, and the grade of fluorite (CaF 2 ) grade is 30.25%, rare earth (REO) grade is 6.00%. Utilize the method of the present invention to finally obtain the iron concentrate with an iron grade of 65.09% and a recovery rate of 85.87%; the rare earth concentrate with a rare earth grade of 66.79% and a recovery rate of 80.32%; the fluorite grade of 95.82% and a recovery rate of 82.37% The fluorspar concentrate specifically comprises the following steps:

[0048] (1) Feed the Baiyun Obo tailings into a wet permanent magnetic drum magnetic separator with a magnetic field strength of 0.2T to obtain weak magnetic pre-enrichment concentrates and weak magnetic pre-enrichment tailings.

[0049] (2) Feeding the weak magnetic pre-enrichment tailings into a vertical ring wet high-strength magnetic separator with a magnetic field strength of 0.6T to obtain h...

Embodiment 3

[0057] In this example, the tailings in the Baiyun Obo tailings pond are used as raw materials, in which the grade of iron (TFe) is 17.74%, and the grade of fluorite (CaF 2 ) grade is 28.96%, rare earth (REO) grade is 6.85%. Utilize the method of the present invention to finally obtain the iron concentrate with an iron grade of 66.13% and a recovery rate of 77.69%; the rare earth concentrate with a rare earth grade of 65.21% and a recovery rate of 81.57%; the fluorite grade of 95.63% and a recovery rate of 81.86% The fluorspar concentrate specifically comprises the following steps:

[0058] (1) Feed the Baiyun Obo tailings into a wet permanent magnetic drum magnetic separator with a magnetic field strength of 0.2T to obtain weak magnetic pre-enrichment concentrates and weak magnetic pre-enrichment tailings.

[0059] (2) Feeding the weak magnetic pre-enrichment tailings into a vertical ring wet high-strength magnetic separator with a magnetic field strength of 0.65T to obtain ...

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Abstract

The invention relates to a mineral processing method for recovering iron, rare earth, fluorite and niobium from iron tailings associated with polymetallic minerals, and belongs to the field of mineral processing engineering and comprehensive resource recovery and utilization. This method uses Bayan Obo tailings as raw materials, carries out weak magnetic separation and strong magnetic separation for pre-enrichment, then fluidizes the obtained pre-enriched concentrate and roasts it, and subjects the roasted ore obtained by weak magnetic separation to Weak magnetic concentrate and weak magnetic tailings containing rare earth are obtained; then the weak magnetic tailings are subjected to rare earth flotation operation, and finally the rare earth flotation concentrate and rare earth flotation tailings are obtained, and then the rare earth flotation tailings are acid leached After the process, niobium-rich slag and pickling tailings are obtained. At the same time, the pre-enriched strong magnetic tailings are subjected to fluorite flotation operation to obtain fluorite flotation concentrate and fluorite flotation tailings. This method finally obtains fluorspar concentrate, iron concentrate, rare earth concentrate and niobium-rich slag, realizing the comprehensive utilization of Bayan Obo tailings.

Description

technical field [0001] The invention relates to a beneficiation method for recovering iron, rare earth, fluorite and niobium from iron tailings of associated polymetallic minerals, and belongs to the field of mineral processing engineering and resource comprehensive recovery and utilization. Background technique [0002] Baiyun Obo Iron Mine is a representative of associated polymetallic ore, which is rich in rare earth, iron, niobium, fluorite and other minerals, and is a large comprehensive deposit. At present, the utilization of Baiyan Obo Iron Mine is limited to the recovery of iron and rare earths, and the recovery rate of iron is only about 75%, and the recovery rate of rare earths is less than 30%. Other minerals are regarded as gangue piles and stored in tailings ponds. cause waste of resources. According to the data, the content of rare earth ore in the tailings of Baiyun Obo is about 7%, the content of iron mineral is about 15%, and the content of fluorite is abou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00C22B1/10
CPCB03B7/00C22B1/10
Inventor 李文博韩跃新单彦李艳军
Owner NORTHEASTERN UNIV LIAONING