Magnetic iron ore concentrating technology

A magnetite and process technology, applied in the field of magnetite selection process, can solve the problems of being unsuitable for the metallurgical industry concentrate policy, energy saving and environmental protection, unsuitable for lean magnetite ore beneficiation, and low iron concentrate grade, etc. The effect of low, improving grade and high recovery rate

Active Publication Date: 2014-07-02
何征徽
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the magnetite beneficiation technology mostly adopts the stage grinding-stage weak magnetic separation process of single weak magnetic separation. This process and equipment are not suitable for the beneficiation of fine-grained and poor magnetite ore, and the recovery rate of iron in iron concentrate is low. , generally less than 70%, the grade of iron ore concentrate is low, and the content of impurities is high, which is not suitable for the metallurgical industry's fine material policy and the requirements of energy conservation and environmental protection

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  • Magnetic iron ore concentrating technology
  • Magnetic iron ore concentrating technology
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking Pingwu iron ore with a grade of 36.84% iron as an example, the iron ore is crushed through a crusher for primary crushing, and the ore discharge particle size is not greater than 200mm. The product after primary crushing enters the jaw crusher again for secondary crushing , the ore discharge particle size is not greater than 40mm, the secondary crushed product and water enter the ball mill for grinding at a mass ratio of 1:1, and the pulverized pulp enters the high-frequency sieve for screening, and the product with a particle size greater than 100 mesh on the sieve is returned The ball mill grinds again; after screening, the qualified (product particle size is not greater than 100 mesh) pulp and water enter the magnetic separation unit with a mass ratio of 1:2 for magnetic separation. The magnetic separation unit consists of three 2500-3000 Gauss magnetic Concentrator structure, the pulp enters the magnetic separator for magnetic separation to obtain rough concen...

Embodiment 2

[0026] Taking the Aba Xiaohe iron ore with a grade of 33.62% iron as an example, the beneficiation process is the same as Example 1, and finally a concentrate with a grade of 64.44% iron is obtained.

[0027] Similarly, the concentrate and the secondary concentrate mixture entering the circulation barrel from the magnetic separation unit and the strong magnetic separator in this embodiment are detected to obtain the grade of the mixture containing 54.49% iron, and the concentrate entering the concentrate overflow pipe is detected The iron content of the concentrate grade is 62.78%. From this, it is known that the iron content of the obtained concentrate grade is only 54.49% when using the technology without circulating barrel equipment, and the obtained concentrate grade is only 54.49%. The ore grade contains 62.78% iron.

Embodiment 3

[0029] Taking iron fine powder with 50% iron-containing sulfuric acid slag in An County, Mianyang as an example, the selection process is the same as Example 1. The difference is that the sulfuric acid slag is not crushed and directly enters the ball mill for grinding, and the finally obtained iron fine powder contains iron 62- 63%, the recovery rate is more than 70%, 5-7% higher than other dressing plants, the iron content is more than double, and the recovery rate is more than 10% higher.

[0030] Equally, detect the iron fine powder that this embodiment enters the circulation tank from the magnetic separation unit and the strong magnetic separator to get the grade iron content of 58% of this iron fine powder, detect the iron fine powder that enters the concentrate overflow pipe to get this The concentrate grade contains 61% iron. From this, it is known that when the process without circulating barrel equipment is used, the iron content of the concentrate grade is only 57%. ...

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Abstract

The invention discloses a magnetic iron ore concentrating technology. The magnetic iron ore concentrating technology includes the steps of fragmenting, ball milling, magnetic separating, high-intensity magnetic separating and stirring and concentrating after entering a circulating barrel. Concentrated ore overflows into an ore concentrate pool, cleaning, impurity removing and ore pressing are performed through a high-pressure water jetting device to obtain ore concentrate, and meanwhile ore which does not overflow into the ore concentrate pool is conveyed through a pumping pipe to a magnetic separation unit again for magnetic separation. The magnetic iron ore concentrating technology is low in cost and energy consumption, simple in process, high in recovery rate and capable of greatly improving the grade of the ore without adding agents.

Description

technical field [0001] The invention relates to an ore beneficiation technology, in particular to a magnetite beneficiation process. Background technique [0002] The main characteristics of my country's iron ore are "poor", "fine" and "miscellaneous". The iron grade is 32%-37%, which is about 10 percentage points lower than the world average grade. Among them, 97% of the iron ore needs to be processed. Magnetite ore beneficiation has always been the main body of iron ore beneficiation. In my country's iron ore concentrate output, it is mainly magnetite concentrate. At present, the magnetite beneficiation technology mostly adopts the stage grinding-stage weak magnetic separation process of single weak magnetic separation. This process and equipment are not suitable for the beneficiation of fine-grained and poor magnetite ore, and the recovery rate of iron in iron concentrate is low. , generally less than 70%, the grade of iron ore concentrate is low, and the content of impu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B1/00
Inventor 何征徽
Owner 何征徽
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