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A kind of refractory brick for blast furnace slag high temperature carbonization electric furnace and preparation method thereof

A technology of high-temperature carbonization and refractory bricks, which is applied in the field of refractory materials, can solve the problems of fast erosion, no slag hanging, and low service life, and achieve excellent chemical stability and wear resistance, improve high temperature resistance, and high strength.

Active Publication Date: 2021-04-27
攀钢冶金材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the working layer of electric furnace mainly adopts traditional electric furnace magnesia-carbon bricks, which have problems such as fast erosion, no slag hanging, low service life and high cost of refractory materials in use, which seriously restricts the promotion and application of this project.

Method used

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  • A kind of refractory brick for blast furnace slag high temperature carbonization electric furnace and preparation method thereof
  • A kind of refractory brick for blast furnace slag high temperature carbonization electric furnace and preparation method thereof
  • A kind of refractory brick for blast furnace slag high temperature carbonization electric furnace and preparation method thereof

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preparation example Construction

[0061] The present invention also provides a method for preparing refractory bricks for high-temperature carbonization of blast furnace slag, comprising the following steps:

[0062] A) In terms of mass fraction, 10-12% of 200-mesh fused magnesia, 3-5% of 5 μm activated alumina micropowder, 5-8% of 200-mesh fused spinel powder, 3-5% of ≤ Mix 45μm titanium dioxide, 4-5% antioxidant and 3-4% phenolic resin, and discharge it for later use;

[0063] B) Add 15-20% of 6-3mm fused magnesia, 20-30% of 3-1mm fused magnesia and 15-20% of 1-0.074mm fused magnesia to the mixture in step A) Mixing in the medium for 2-3 minutes, then adding an organic binder, then adding 5-8% flake graphite, mixing and milling for 5-10 minutes, and discharging;

[0064] C) making bricks from the mixed material in the step B), curing naturally for more than 24 hours, and drying to obtain refractory bricks for high-temperature carbonization of blast furnace slag.

[0065] In the present invention, the types...

Embodiment 1

[0074] The present embodiment adopts the raw material proportioning in table 2;

[0075] Put the fine powder other than flake graphite into the pre-mixer in proportion and mix it for 10 minutes, then discharge it for later use;

[0076] Then pour the three kinds of magnesia granular aggregates into the high-speed mixer in proportion, after mixing for 2 minutes, add an organic binder to wet the aggregate, continue mixing for 2 minutes, add flake graphite and mix for 3 minutes, and finally add The pre-mixed mixed powder is fully mixed and milled for 5 minutes, and the bricks are made with a brick press of more than 630 tons. The finished bricks are naturally cured for more than 24 hours, dried at 180°C for more than 24 hours, sorted and packaged.

Embodiment 2

[0078] The present embodiment adopts the raw material proportioning in table 2;

[0079] Put the fine powder other than flake graphite into the pre-mixer in proportion and mix it for 12 minutes, then discharge it for later use;

[0080] Then pour the three kinds of magnesia granular aggregates into the high-speed mixer in proportion, and after mixing for 3 minutes, add an organic binder to wet the aggregate, continue mixing for 3 minutes, add flake graphite and mix for 4 minutes, and finally add The pre-mixed mixed powder is fully mixed and milled for 7 minutes, and the bricks are made with a brick press of more than 630 tons. The finished bricks are naturally cured for more than 24 hours, dried at 200°C for more than 24 hours, sorted and packaged.

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Abstract

The invention provides a refractory brick for high-temperature carbonization of blast furnace slag, which is made of the following components in mass fraction: fused magnesia > 3mm and ≤ 6mm: 15% to 20%; fused magnesia > 1mm and ≤ 3mm : 20~30%; >0.074mm and ≤1mm fused magnesia: 15~20%; 200 mesh fused magnesia: 10~12%; 5μm activated alumina powder: 3~5%; 200 mesh fused magnesia Spinel powder: 5-8%; ≤45μm titanium dioxide: 3-5%; flake graphite: 5-8%; antioxidant: 4-5%; phenolic resin: 3-4%; the total amount of the above raw materials is 100% . The matrix part of the present invention can form a high-melting point phase at high temperature to improve the high-temperature fire resistance of the product; also introduce TiO 2 , Improve the high temperature resistance, erosion resistance and slag hanging performance of refractory bricks. The invention also provides a method for preparing refractory bricks for blast furnace slag high-temperature carbonization electric furnace.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a refractory brick for high-temperature carbonization electric furnace of blast furnace slag and a preparation method thereof. Background technique [0002] Containing TiO in Panzhihua Iron and Steel Blast Furnace Slag 2 21% to 25%, with an annual emission of more than 7 million tons. At present, Panzhihua Iron and Steel Co., Ltd. is vigorously carrying out research on the extraction of titanium by using the high-temperature carbonization and low-temperature chlorination of blast furnace slag, and has built a pilot line with an annual output of 26,000 tons. The first step will fully realize industrialization. [0003] Among them, the high-temperature carbonization process uses an electric furnace for smelting. The smelting and slag removal temperature is 1600-1700 ° C. During smelting, a large amount of reducing agent will be added and the furnace cover...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/043C04B35/622
CPCC04B35/043C04B35/622C04B2235/3217C04B2235/3222C04B2235/3232C04B2235/425C04B2235/96
Inventor 万红伶李冬梅段大福段晓东王怀斌杨强童武兵张永生李娇
Owner 攀钢冶金材料有限责任公司
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