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Air permeable brick core brick, preparation method and use thereof

A technology of breathable bricks and core bricks, which is applied in the field of ladle furnace refining, which can solve the problems of high thermal expansion coefficient of corundum, pollution of atmospheric groundwater, and reduced service life, and achieve the effects of improved strength, high air permeability, and short process

Active Publication Date: 2018-08-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used materials for diffused air permeable bricks are corundum and chrome corundum. Due to the high thermal expansion coefficient of corundum, the former is often damaged by cracking and peeling of the permeable brick due to thermal shock, which greatly reduces the service life. The latter is due to the formation of chromium oxide after use. Hexavalent chromium is toxic and will cause serious harm to the human body after contact, and if the used refractory is not properly disposed of, it will cause serious pollution to the atmosphere and groundwater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] This embodiment provides a kind of preparation method of breathable brick core brick, and its specific method is:

[0068] Raw material: industrial silicon carbide powder, particle size d 50 =100μm, SiC phase content 99.0%; alumina fine powder, particle size d 50 =2.1 μm; activated alumina fine powder, purity 99%, average particle diameter 1.0 μm; silicon dioxide fine powder, average particle diameter 0.27 μm.

[0069] (1) Take by weighing 92wt% of silicon carbide micropowder, 2wt% of alumina micropowder, 1wt% of activated alumina micropowder, 1wt% of silica micropowder, and 3wt% charcoal powder as a pore-forming agent, and add alumina-containing mass in this mixture The aluminum sol with a fraction of 1% is mechanically stirred until the materials are evenly mixed, then placed in a mold, and formed under a pressure of 25MPa. Dry in the air environment for 24 hours after demoulding, and dry in a drying kiln at 110°C for 24 hours;

[0070] (2) Put it in the sintering ...

Embodiment 2

[0075] This embodiment provides a kind of preparation method of breathable brick core brick, and its specific method is:

[0076] Raw material: silicon carbide powder, particle size d 50 =200 μm, purity 99.1%; activated alumina micropowder, purity 99%, average particle size 1.0 μm; commercially available alumina sol and silica sol.

[0077] (1) Weigh 96wt% of silicon carbide micropowder and 2wt% of alumina micropowder, add aluminum sol with a mass fraction of alumina of 1wt% and silica sol with a mass fraction of silica of 1wt% in this mixture, and fully stir through mechanical Until the material is uniform, put it in the mold and shape it under the pressure of 30MPa. Dry in the air for 24 hours after demoulding, and then dry in a drying kiln at 110°C for 24 hours;

[0078] (2) Put it in the sintering furnace and raise the temperature to 620°C at a speed of 1.5°C / min, keep it for 1 hour, discharge the organic additives, then raise the temperature to 1450°C at a speed of 2°C / ...

Embodiment 3

[0083] This embodiment provides a kind of preparation method of breathable brick core brick, and its specific method is:

[0084] Raw material: silicon carbide powder, particle size d 50 =200μm, purity 99.1%; aluminum sol and SiO 2 The mass fraction is 28% tetraethyl orthosilicate solution.

[0085] (1) Weigh 97wt% of silicon carbide micropowder, add alumina sol with a mass fraction of 1.5wt% of alumina and tetraethyl orthosilicate with a mass fraction of silica of 1.5wt% as a binding agent in this mixture, and The weighed raw materials are fully stirred by the mixer, and after the materials are mixed evenly, they are placed in the mold and rammed by hand. Dry in air for 24 hours after demoulding, and then dry in a kiln at 110°C for 24 hours;

[0086] (2) Put it in a sintering furnace and raise the temperature to 620°C at a rate of 1.5°C / min, hold for 1 hour to fully discharge the added volatile substances, then raise the temperature to 1450°C at a rate of 2°C / min, and hold...

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Abstract

The invention discloses an air permeable brick core brick, a preparation method and use thereof. The air permeable brick core brick is composed of a high temperature resistant ceramic material, and the ceramic material mainly consists of silicon carbide and mullite and contains pores. The preparation method comprises: (1) mixing silicon carbide, an aluminum source and a silicon source, and puttingthe obtained mixture into a mould for moulding to obtain a green body; and (2) firing the green body obtained in step (1) to obtain the air permeable brick core brick. The air permeable brick core brick is used for preparation of diffuse type air permeable bricks or compound air permeable bricks. The air permeable brick core brick provided by the invention has the advantages of high strength, wear resistance, scouring resistance, excellent thermal shock resistance, uniform structure, large porosity, reasonably distributed and communicated pores, and convenient use. The preparation method provided by the invention has the advantages of short process, simple operation and low cost, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of external refining of ladle furnaces, and relates to an air-permeable core brick, a preparation method and application thereof. Background technique [0002] When the ladle is refined outside the furnace, inert gas such as argon is sprayed into the molten steel in the furnace through the breathable brick installed at the bottom of the ladle. When the gas encounters high temperature, it expands violently and plays the role of stirring molten steel and refining agent. It can not only effectively make the composition and temperature of molten steel reach a balanced state, but also the bubbles formed by dispersion can promote the formation of steel slag and refractory materials in the steelmaking process. The reaction products formed by spalling or melting loss float up, thereby reducing the inclusions in molten steel and greatly improving the quality of the slab. Breathable bricks are affected by several asp...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/565C04B38/06
CPCC04B35/185C04B35/565C04B38/068C04B2235/3481C04B2235/36C04B2235/6562C04B2235/661C04B2235/96C04B38/0074C04B38/0054
Inventor 刘开琪张会军孙广超陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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