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High-silica magnesian fluxed pellet for blast furnace and production method of high-silica magnesian fluxed pellet

A production method, high-silicon-magnesium technology, applied to blast furnaces, blast furnace details, furnaces, etc., can solve problems such as immaturity, rotary kiln ring formation, etc., achieve low production costs, reduce powder rate, and increase the use ratio.

Inactive Publication Date: 2017-07-28
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of low-silicon magnesia flux pellets is relatively mature, but the technology of using grate rotary kiln to produce high-silicon magnesia flux pellets is not yet mature, especially the problem of ring formation in the rotary kiln

Method used

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  • High-silica magnesian fluxed pellet for blast furnace and production method of high-silica magnesian fluxed pellet
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  • High-silica magnesian fluxed pellet for blast furnace and production method of high-silica magnesian fluxed pellet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The specific production process of the high-silicon magnesium flux pellets used in this blast furnace is as follows.

[0023] (1) Proportion according to the mass fraction required by the following ingredients: SiO 2 3.5%, MgO 1.5%, alkalinity 1.2; other ingredients must meet Al 2 o 3 ≤1.5%, K 2 O+Na 2 O≤0.1%, Zn≤0.02%, S≤0.05%, P≤0.07%. Among them, the proportion of laterite ore is 0.5wt%, the proportion of anthracite powder is 0.2wt%, and the proportion of other raw materials is calculated according to the above composition requirements.

[0024] (2) After the raw materials are mixed, they pass through the high-pressure roller mill, and the proportion of particle size less than 0.074mm reaches 88%; after that, they are mixed by a powerful mixer, and the mixture enters the disc pelletizer to form green pellets, with a particle size of 9-13.5mm.

[0025] (3) The raw balls enter the grate machine, go through blast drying, exhaust drying, preheating stage...

Embodiment 2

[0026] Example 2: The specific production process of the high-silicon magnesium flux pellets used in the blast furnace is as follows.

[0027] (1) Proportion according to the mass fraction required by the following ingredients: SiO 2 4.5%, MgO 2.0%, alkalinity 1.0; other ingredients must meet Al 2 o 3 ≤1.5%, K 2 O+Na 2 O≤0.1%, Zn≤0.02%, S≤0.05%, P≤0.07%. Among them, the proportion of laterite ore is 1.5wt%, the proportion of anthracite powder is 0.5wt%, and the proportion of other raw materials is calculated according to the above composition requirements.

[0028] (2) After the raw materials are mixed, they pass through the high-pressure roller mill, and the proportion of particle size less than 0.074mm reaches 92%; after that, they are mixed by a powerful mixer, and the mixture enters the disc pelletizer to form green pellets, with a particle size of 9-13.5mm.

[0029] (3) The raw balls enter the grate machine, go through blast drying, exhaust drying, preheating stage ...

Embodiment 3

[0030] Example 3: The specific production process of the high-silicon magnesium flux pellets used in the blast furnace is as follows.

[0031] (1) Proportion according to the mass fraction required by the following ingredients: SiO 2 5.5%, MgO 2.2%, alkalinity 0.8; other ingredients must meet Al 2 o 3 ≤1.5%, K 2 O+Na 2O≤0.1%, Zn≤0.02%, S≤0.05%, P≤0.07%. Among them, the proportion of laterite ore is 3.0wt%, the proportion of anthracite powder is 1.0wt%, and the proportion of other raw materials is calculated according to the above composition requirements.

[0032] (2) After the raw materials are mixed, they are passed through a high-pressure roller mill, and the proportion of particles smaller than 0.074mm reaches 86%; after that, they are mixed by a powerful mixer, and the mixture enters a disc pelletizer to form green pellets, with a particle size of 9-13.5mm.

[0033] (3) The raw balls enter the grate machine, go through blast drying, exhaust drying, preheating stage ...

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Abstract

The invention discloses a high-silica magnesian fluxed pellet for a blast furnace and a production method of the high-silica magnesian fluxed pellet. The high-silica magnesian fluxed pellet comprises, by mass fraction, 3.5%-5.5% of SiO2, 1.5%-2.2% of MgO, 0.8%-1.2% of basicity, not larger than 1.5% of Al2O3, not larger than 0.1% of K2O and Na2O, not larger than 0.02% of Zn, not larger than 0.05% of S and not larger than 0.07% of P. The silica content of the pellet is high, the pellet can be produced through high-silica iron fine powder, the using proportion of the pellet in the blast furnace is improved, meanwhile, the using scope of the iron fine powder is enlarged, and the using proportion of the iron fine powder inland is improved. By means of the method, the high-silica iron fine powder can be used for producing the magnesian fluxed pellet, the production cost is reduced, meanwhile, the pellet qualified in quality can be obtained, and requirement of the blast furnace for using the high proportion of pellet is met; and by means of the method, the scope of the iron fine powder used for producing the magnesian fluxed pellet can be expanded, and the using amount of the high-silica iron fine powder inland can be particularly improved. The method has the beneficial effects of being low in production cost, simple in process and excellent in product performance.

Description

technical field [0001] The invention relates to a pellet for a blast furnace, in particular to a high-silicon magnesium flux pellet for a blast furnace and a production method thereof. Background technique [0002] The current domestic environmental protection situation is very severe, and the traditional iron and steel process mainly uses sintered ore as raw material, which has large pollutant emissions, high energy consumption, and great pressure on environmental protection. Compared with the sintering process, the pelletizing process has low pollutant emissions and low energy consumption, which is more in line with the current environmental protection requirements. Due to the raw material requirements of blast furnace ironmaking, pellets are used instead of sintered ore, and magnesia flux pellets whose composition and performance meet the requirements need to be produced. At present, the production of low-silicon magnesia flux pellets is relatively mature, but the techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/242C21B5/00
CPCC22B1/2406C21B5/008C22B1/02C22B1/242
Inventor 于勇王新东田欣刘连继宋润平肖洪于树海张文强高冰
Owner TANGSHAN IRON & STEEL GROUP
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