Method for extracting micro-fine-particle iron ore concentrate from tailings obtained after primary iron separation

A technology of iron concentrate and microfine particles, which is applied in chemical instruments and methods, wet separation, solid separation, etc., to achieve the effects of improved recovery rate, high economic benefits, and friendly operating environment

Inactive Publication Date: 2016-05-04
陈均宁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for extracting fine-grained iron concentrate from primary iron-separation tailings, which can solve the problem of recovering fine-grained iron minerals less than 0.01 mm in red mud tailings after primary magnetic separation , improve recovery rate and yield, save investment, reduce energy consumption, wide applicability, no impact on alumina production process, no special requirements

Method used

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  • Method for extracting micro-fine-particle iron ore concentrate from tailings obtained after primary iron separation
  • Method for extracting micro-fine-particle iron ore concentrate from tailings obtained after primary iron separation
  • Method for extracting micro-fine-particle iron ore concentrate from tailings obtained after primary iron separation

Examples

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Embodiment 1

[0030] An example of the method for extracting microfine grain iron ore concentrate from primary iron dressing tailings described in the present invention, comprises the following steps:

[0031] Short-circuit the pipeline before the tailings are sent to the thickening workshop by the underflow of the iron thickening machine, and the tailings are transported to the slurry tank of the iron processing plant through the pipeline Φ5000×5500mm. Add NSF type dispersant to the dry ore, and then use the hydraulic pressure difference on the slurry tank to make the red mud slurry flow to the cylindrical sieve by itself, and the sieve residue with a particle size greater than 500 μm is discharged into the tailings thickener as tailings, and the red mud with a particle size of less than 500 μm Enter DLS-250 vertical-ring pulsating high-gradient magnetic separator for rough separation, the magnetic field strength is 1-2T, and the iron ore concentrate obtained from the rough selection enters...

Embodiment 2

[0033] Another example of the method for extracting microfine grain iron concentrate from the primary iron dressing tailings of the present invention comprises the following steps:

[0034]Short-circuit the pipeline that transports the tailings to the thickener from the primary iron extraction coarse and fine-tuning magnetic separator through the pipeline, and use the pipeline to transport the rough and fine-tuning tailings to the slurry tank of the iron dressing plant Φ5000×5500mm, and adjust the slurry During the process, 10-25g / t of dry ore is added with NSF type dispersant, and then the red mud slurry is automatically flowed to the cylindrical sieve by using the hydraulic pressure difference on the slurry tank, and the sieve residue with a particle size greater than 500 μm is discharged into the tailings denser as tailings. machine, the rougher tailings red mud with a particle size of less than 500μm enters the DLS-250 vertical ring pulsating high gradient magnetic separato...

Embodiment 3

[0036] Another example of the method for extracting microfine grain iron concentrate from the primary iron dressing tailings of the present invention comprises the following steps:

[0037] Short-circuit the pipeline before the tailings are sent to the thickening workshop by the underflow of the iron thickening machine, and the tailings are transported to the slurry tank of the iron processing plant through the pipeline Φ5000×5500mm. Add NSF type dispersant to the dry ore, and then use the hydraulic pressure difference on the slurry tank to make the red mud slurry flow to the cylindrical sieve by itself, and the sieve residue with a particle size greater than 500 μm is discharged into the tailings thickener as tailings, and the red mud with a particle size of less than 500 μm Enter the ZH2600 flat-ring pulsating high-gradient magnetic separator for magnetic separation, the medium field strength is greater than 3.2T, and the magnetic field gradient is greater than 106mm. Before ...

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Abstract

The invention discloses a method for extracting micro-fine-particle iron ore concentrates from tailings obtained after primary iron separation. The method includes the following steps that red mud tailings obtained after primary iron separation are subjected to roughing and concentration of a high-gradient magnetic separator to obtain coarse-particle iron ore concentrates, wherein a large number of micro-fine-particle iron ore concentrates are contained in the tailings obtained after roughing and the tailings obtained after concentration, and an NSF dispersing agent is added for slurry mixing; a polyacrylamide A type flocculant is added before magnetic separation, roughing and concentration are conducted through a vertical-ring high-gradient magnetic separator or one-time beneficiation is conducted through a flat-ring high-gradient magnetic separator, and the iron ore concentrates are obtained; and the tailings are condensed through a thickener and then pumped into a red mud storeroom to be piled, supernatant of the thickener is used for cyclic slurry mixing and ore flushing in a system, and tailing slag and water are not discharged outside. The method is suitable for tailings containing more than 15% of Fe and with the slurry concentration ranging from 30%-45% and has the beneficial effects that the technology is simple, operation is environment-friendly, and adaptability is high.

Description

technical field [0001] The invention relates to the technical field of ore dressing, and relates to a method for extracting fine-grained iron concentrates from primary iron beneficiation tailings. Background technique [0002] The existing red mud iron separation process is as follows: pumping red mud-stirring-grid screen slag removal-twice strong magnetic separation-concentrate thickening-concentrate pressure filtration-tailing concentrated return, washing or thickening three times and then sending to In the concentration workshop, the filtrate is used as water replenishment on site. The existing design indicators are: the raw ore red mud contains about 26% Fe, the Fe grade of the concentrate is ≥55%, and the Fe recovery rate is 22%. The size of the iron minerals in the red mud affects the iron recovery index. The important factor is that the amount of iron metals smaller than 0.01mm in the red mud accounts for 52.21%, and the amount of iron metals in the gangue accounts fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03C1/025
CPCB03B7/00B03C1/025
Inventor 陈均宁黎方正黄荣满周干联钟文潘建军付力豪张美义蒋鲲鹏刘泽梁媛黄柳萍
Owner 陈均宁
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