Novel micropore corundum brick and preparation method thereof

Abstract

The invention discloses a novel micropore corundum brick which is not only good in alkali resistance, scrap resistance and iron corrosion resistance, but also has a good micropore structure, and a preparation method of the corundum brick. The novel micropore corundum brick is characterized by being prepared from the following raw materials in percentage by weight: 6-11% of metal silicon, 4-16% of silicon carbide, 3-7% of aluminum trioxide, 28-52% of dense corundum, 6-11% of mullite, 18-38% of brown fused alumina and 2-7% of resin. In the preparation steps, a full-automatic 2500T hydraulic machine is adopted for side surface pressing and forming, and a novel energy-saving environment-friendly shuttle type kiln is adopted for sintering. The novel micropore corundum brick disclosed by the invention can not only meet the requirement on the service life of a blast furnace, but also can completely take the place of imported products to be used as a ceramic cup, including combined bricks at a tuyere, an iron buckle and a scrap hole in a furnace cylinder area of the blast furnace, and the brick can be used in match with mold pressed small carbon bricks for building a brick lining of the furnace cylinder, and can be also used in match with large-block carbon bricks for building the brick lining of the furnace cylinder.

Description

technical field [0001] The invention relates to a refractory material for a blast furnace hearth, in particular to a novel microporous corundum brick used for a blast furnace hearth and a preparation method for the microporous corundum brick. Background technique [0002] Corundum bricks are mainly used in ironmaking blast furnaces and blast furnace hot blast stoves, refining furnaces outside steelmaking furnaces, sliding water vessels, glass melting furnaces, and petrochemical industrial furnaces. In addition, they are widely used in cracking and reforming furnaces in petrochemical and chemical fertilizer industries. , metallurgical industry and other high-temperature kiln linings, and kiln furniture. Microporous corundum bricks are widely used in blast furnace hearths as ceramic cup bricks because of their good alkali resistance, slag resistance, and iron corrosion resistance. The slag properties are relatively poor, and the microporous effect is not good, and there are m...

AI Technical Summary

Problems solved by technology

However, most ceramic cup bricks are not microporous or ultra-microporous bricks. Iron slag and alkali substances penetrate into the brick body through the pores, which reduces the refractory performance of the brick (lower melting point), and is subject to chemical erosion. The original structure of the brick is damaged. Destruction, the strength is greatly reduced, and the erosion resistance is also reduced

Practice has proved that it is difficult to determine the exact service life of existing ceramic cups

In the early stage of application, it protects the hearth and bottom carbon bricks of the blast furnace. However, in the middle and later stages of the blast furnace, it is still maintained by carbon bricks, so it is difficult to achieve longevity.

[0005] The existing microporous corundum bricks have poor alkali resistance and slag resistance, and the microporous effect is not good. Many companies do not tend to use domestic microporous corundum bricks, and the existing products are originally made of double discs. Friction press plane press molding, the product size is not accurate enough, the product was originally fired in a guided flame kiln, because the temperature distribution in the kiln is not uniform, which is not conducive to the formation of microporous product structure

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