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Refractory Sialon corundum brick material for blast flurnace and its prepn process

A technology of sialon corundum bricks and refractory materials, which is applied in the field of sialon corundum brick composite refractory materials for blast furnaces and its preparation, can solve the problems that the use performance is difficult to meet blast furnace ironmaking, etc., and achieve low raw material prices, simple processes, and blast furnace The effect of using the coefficient increase

Inactive Publication Date: 2007-02-14
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the improvement of blast furnace ironmaking technology and the need to extend the service life of refractory materials, the performance of these materials has been difficult to meet the higher requirements of blast furnace ironmaking, especially in terms of resistance to molten iron loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix a certain amount of fused brown corundum particles with fine powder, metal aluminum powder, metal silicon powder, alumina fine powder and titanium dioxide powder. Percentage by weight: fused brown corundum 60-70%, metal silicon powder 8-10%, metal aluminum powder 12-15%, alumina micropowder 3-9%, titanium dioxide 2-8%, plus 2-5% Temporary slurry. The gradation and weight percentage of the above-mentioned brown corundum particles are as follows: 5-3mm accounts for 15-20%, 3-1mm accounts for 20-25%, 1-0mm accounts for 15-20%, and less than 0.088mm accounts for 1-20%. The process conditions are: kneading in a mixing mill, forming and drying, and firing in a nitrogen atmosphere in a nitriding furnace, and the nitrogen used is industrial nitrogen. The firing temperature is from room temperature to 1450°C, and the heating rate is 0.5 to 1°C / min. The segmented heat preservation is at 1200 to 1300°C for 10 to 12 hours, and then the temperature is raised to 1400 to 1450°C, ...

Embodiment 2

[0017] Mix certain electric fused dense corundum particles with fine powder, metal aluminum powder, metal silicon powder, alumina fine powder, clay and titanium dioxide powder. Percentage by weight: fused dense corundum 60-70%, metal silicon powder 8-10%, metal aluminum powder 12-15%, alumina micropowder 3-9%, titanium dioxide 2-8%, clay 0-2%, Add 2-5% temporary pulp liquid. The gradation and weight ratio of fused dense corundum particles are as follows: 5-3mm accounts for 15-20%, 3-1mm accounts for 20-25%, 1-0mm accounts for 15-20%, and less than 0.088mm accounts for 1-20%. The process conditions are kneading in a mixing mill, forming and drying, and firing in a nitrogen atmosphere in a nitriding furnace. The firing temperature ranges from room temperature to 1450°C, heat preservation in sections, heating rate 0.5-1°C / min, heat preservation at 1000-1100°C for 18-20 hours, and then heat up to 1400-1450°C for 8-10 hours, the nitrogen used is industrial nitrogen. After the tr...

Embodiment 3

[0019] A certain amount of fused white corundum particles and fine powder are mixed with metal aluminum powder, metal silicon powder, alumina fine powder, silicon dioxide powder and titanium dioxide powder. Percentage by weight: 60-70% for fused white corundum, 8-10% for metal silicon powder, 12-15% for metal aluminum powder, 3-9% for alumina micropowder, 2-8% for titanium dioxide, Silicon powder is 0.5-2%, plus 2-5% temporary pulp liquid. The gradation and weight percentage of the fused white corundum particles are as follows: 5-3mm accounts for 15-20%, 3-1mm accounts for 20-25%, 1-0mm accounts for 15-20%, and less than 0.088mm accounts for 1-20%. The process conditions are kneading in a mixing mill, forming and drying, and firing in a nitrogen atmosphere in a nitriding furnace. The nitrogen used is industrial nitrogen. The firing temperature ranges from room temperature to 1450°C. The segmented heat preservation is 12 to 15 hours at 1100 to 1200°C, and then heated to 1400 t...

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PUM

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Abstract

The refractory sialon corundum brick material for blast furnace is prepared with corundum grain and powder 60-75 wt%, metal silicon powder 5-12 wt%, metal aluminum powder 10-15 wt%, titania powder 1-8 wt%, alumina powder 3-9 wt%, silica powder 0-2 wt%, clay 0-2 wt% temporary paper pulp or phnolic resin binding agent 2-5 wt%, and through mixing, forming, drying, sintering at nitrogen atmosphere. The refractory sialon corundum brick material has excellent alkali resistance, excellent slag resistance, high heat shock stability, high wear resistance and excellent molten iron fuse loss resistance. The refractory sialon corundum brick material may be used widely for large and medium sized blast furnaces.

Description

1. Technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a sialon corundum brick composite refractory material for blast furnaces and a preparation method thereof. 2. Background technology [0002] There are two schools of thought on blast furnace lining materials: thermal solution and refractory solution. The "heat conduction method" ensures the life of the blast furnace through a strong cooling wall. Because of its practicability, various high thermal conductivity carbon refractory materials (such as graphitization, semi-graphitization, microporous carbon bricks, etc.) and silicon carbide (such as silicon nitride bonded silicon carbide, sialon bonded carbon Silicon, etc.) refractory materials are developing rapidly. However, these materials have a large heat loss during use and have high requirements for the cooling system; the "refractory material method" is based on the combination of carbonaceous mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/599C04B35/10C04B35/66C04B35/626C04B35/632C04B35/64
Inventor 李亚伟金胜利李楠李远兵
Owner WUHAN UNIV OF SCI & TECH
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