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Method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation

A technology of metallized pellets and fine iron powder, which is applied in the field of metallurgy, can solve the problems of high coke ratio and waste of raw materials and fuels in blast furnaces, and achieve the effect of saving coke and improving the utilization factor of blast furnaces

Active Publication Date: 2014-02-19
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of direct reduction of iron fine powder and carbon circulation by increasing oxygen in order to overcome defects such as high blast furnace coke ratio and waste of raw materials in the prior art Method for producing metallized pellets for use in blast furnace ironmaking production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Ingredients and mixing

[0029] The iron concentrate powder with a moisture content of less than 8% and bentonite are mixed according to a weight ratio of 100:2.5, and then stirred evenly to form a mixed material.

[0030] 2. Grinding of mixed materials

[0031] When the mixed material enters the moistening mill, under the force of beating, pressing, squeezing, bumping, kneading, etc. of the medium and the cylinder, the particle size becomes finer, the particle shape becomes rougher, and the surface energy increases, thereby improving the ball-forming performance of the mixture. ; The grinding time of the grinding machine is 10 minutes.

[0032] 3. Pelletizing of lubricated grinding materials

[0033] Transport the moistening material to the disc of the pelletizing machine, spray water to make the moistening material wet, and at the same time, the material rolls into balls with the help of the mechanical force generated by the rotation of the pelletizing disc, and ...

Embodiment 2

[0050] 1. Ingredients and mixing

[0051] The iron concentrate powder with a moisture content of less than 8% and bentonite are mixed according to a weight ratio of 100: 3.0, and then stirred evenly to form a mixed material.

[0052] 2. Grinding of mixed materials

[0053] When the mixed material enters the moistening mill, under the force of beating, pressing, squeezing, bumping, kneading, etc. of the medium and the cylinder, the particle size becomes finer, the particle shape becomes rougher, and the surface energy increases, thereby improving the ball-forming performance of the mixture. ; The grinding time of the grinding machine is 10 minutes.

[0054] 3. Pelletizing of lubricated grinding materials

[0055] Transport the moistening material to the disc of the pelletizing machine, spray water to make the moistening material wet, and at the same time, the material rolls into balls with the help of the mechanical force generated by the rotation of the pelletizing disc, and...

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Abstract

The invention discloses a method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation. The method mainly comprises the following steps: adding bentonite in a certain proportion into powdered iron to grind, pelletize and dry to obtain green balls; burdening the green balls with block limestones and block semi coke in a certain proportion; adding to a rotary kiln from a kiln tail for oxygenating reducing roasting; meanwhile, throwing powdery limestones from a kiln head to enhance a CO reducing atmosphere in a high-temperature section of the rotary kiln; dry-separating the directly reduced high-temperature materials through a vertical cooling gasifier; recycling the semi coke screened by non-magnetic materials obtained by dry separation for the rotary kiln, and screening the magnetic materials to obtain directly reduced metallized pellets. After the metallized pellets are added into a blast furnace, the coke amount consumed by reducing the oxidized pellets can be saved, and meanwhile, the utilization coefficient of the blast furnace is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for producing metallized pellets through the direct reduction of iron concentrate powder and carbon by increasing oxygen and directly reducing it. Background technique [0002] Ironmaking is an important part of the iron and steel production process. Ironmaking raw materials account for about 80% of ironmaking production costs. With the expansion of domestic steel production capacity, the sustainable development of the iron and steel industry has been restricted by raw materials and fuel factors. Insufficient coking coal quantity and declining quality have become the weak links restricting the development of my country's iron and steel production. Therefore, reducing the cost of iron-making raw materials and increasing iron-making production capacity will be an effective way for iron and steel enterprises to enhance product competitiveness one. [0003] In the existing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24
Inventor 王明华展仁礼权芳民雷鹏飞鲁逢霖张科郭忆李慧春
Owner JIUQUAN IRON & STEEL GRP
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