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Mineral processing method of ultra-low grade iron ore

A beneficiation method and technology of grade, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of reducing grinding processing capacity, reducing grinding cost, large processing capacity, etc., saving electric energy consumption, reducing grinding The effect of reducing the cost of ore and reducing the power of grinding

Active Publication Date: 2017-02-22
HANDAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a mineral processing method of ultra-low-grade iron ore. The method aims at the problems of large processing capacity and great difficulty in the process of processing ultra-low-grade iron ore. Dry separation and screening treatment, throw away the surrounding rocks and waste rocks mixed in the raw ore, realize more crushing and less grinding, reduce the processing capacity of ore grinding, and reduce the cost of ore grinding

Method used

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  • Mineral processing method of ultra-low grade iron ore
  • Mineral processing method of ultra-low grade iron ore
  • Mineral processing method of ultra-low grade iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] first step:

[0055] like figure 1 As shown, the raw ore from the stope is transported to the primary crushing workshop by car, and the raw ore is fed into the primary crushing equipment through the loader: PXZ1216 hydraulic gyratory crusher for primary crushing, and the primary crushed raw ore is transported to the secondary crushing by the belt conveyor Equipment: TC84XH standard hydraulic cone crusher for secondary crushing.

[0056] The raw ore after intermediate crushing is transported to the bulk dry separation equipment by belt conveyor for bulk dry separation. The bulk dry-separated waste rock enters a separate screening system, and the bulk dry-separated ore is transported to the 2YAH2460 circular vibrating screen in the screening dry-separation workshop through a belt conveyor for screening.

[0057] The products on the screen are transported to the fine crushing buffer bin by the belt conveyor, and the ore in the fine crushing buffer bin is conveyed by the ...

Embodiment 2

[0075] This embodiment is carried out on the basis of embodiment 1, the difference is that in the third step,

[0076] The mass ratio of tailings sand, blast furnace water-quenched slag, crushed stone and cement used in this example is 50:40:15:13, the particle size of the crushed stone used is 1mm-5mm, and the mud content is <3%. The cement used is Ordinary Portland Cement No. 425.

[0077] The ore dressing method provided in Example 1 was used to beneficiate the raw ore collected in the Xinglong mining area of ​​Zunhua City. The iron grade of the raw ore was 18% for TFe and 8% for mFe.

[0078] The iron grade of the iron concentrate obtained after ore dressing is 66%, and the recovery rate of total iron is 46.77%. The technical indicators of the main products of tailings dry discharge are shown in Table 1.

[0079] Table 1

[0080] Yield(%) concentration(%) Total tailings 100 19.0 tailings sand 81.3 85.0 wet tailings 18.7 4.63

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Abstract

The invention provides a beneficiation method for ultralow-grade iron ore. The beneficiation method comprises the following steps that dry separation ore is obtained after raw ore is subjected to three-stage crushing, two-stage dry separation and screening; the dry separation ore is subjected to two-stage closed circuit ore grinding, two-stage magnetic separation and concentration magnetic separation, and iron ore concentrate and tailings pulp are obtained; and the tailings pulp is subjected to one-stage closed circuit dehydration, tailings sand is obtained and mixed with blast furnace water quenching slag, crushed stone and cement, and then bricks are made. In the beneficiation method provided by the invention, before beneficiation, surrounding rock, waste rock and the like mixed in the raw ore are thrown away through three-stage crushing, two-stage dry separation and screening treatment to achieve more crushing and less grinding, the treatment quantity of ore grinding is decreased, and the ore grinding cost is lowered. In addition, the tailings sand is mixed with the blast furnace water quenching slag, the crushed stone and the cement, and then the bricks are made, so that recycle of tailings is achieved.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a mineral processing method of ultra-low-grade iron ore. Background technique [0002] Ultra-low-grade iron ore refers to the general term for iron ores that are lower than the industrial grade requirements (TFe<25%) stipulated in the current iron ore geological prospecting specifications, but are profitable to develop and utilize under the current economic and technological conditions. [0003] Due to the low grade of ultra-low-grade iron ore, a certain amount of surrounding rock and waste rock will be mixed into the raw ore during the mining process, which not only increases the mining cost, but also increases the processing capacity of ore dressing and increases the difficulty of ore dressing . [0004] A large amount of tailings are produced during the mineral processing process, and these tailings have been stacked in the tailings pond for a long time, occupyi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/30
CPCB03C1/30
Inventor 张红杰母传伟刘俊李晓娟
Owner HANDAN COLLEGE
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