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Tundish slag blocking wall, impact brick and preparation method thereof

A prefabricated, calcium hexaaluminate technology, applied in the field of refractory materials, can solve the problems of low overall strength, molten steel pollution, high carbon content, and achieve the effects of high overall strength, less molten steel pollution, and strong corrosion resistance.

Inactive Publication Date: 2018-01-19
WUHAN WINNING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing impact bricks use magnesia-carbon bricks and alumina-magnesia-carbon bricks. The thermal expansion of magnesia in magnesia-carbon bricks is easy to cause spalling and fracture. Because alumina-magnesia-carbon bricks use bauxite and magnesia as the main raw materials, there is an overall strength. In addition, the above-mentioned products will cause certain pollution to the molten steel when pouring molten steel. Due to the high carbon content in it, it is especially not suitable for smelting high-quality special steel and other varieties.

Method used

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  • Tundish slag blocking wall, impact brick and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] The calcium hexaaluminate material includes the following raw materials: 50% of the calcium hexaaluminate raw material with a particle size greater than 3mm; 15% of the calcium hexaaluminate raw material with a particle size of 1-3mm; %; 10% of calcium hexaaluminate raw materials with a particle size less than 88 μm; 10% of pure calcium aluminate cement; the above percentages are mass percentages; in addition, 0.10% of the total mass of the above raw materials is added to the water reducing agent.

Embodiment 2

[0021] The calcium hexaaluminate material includes the following raw materials: 25% of the calcium hexaaluminate raw material with a particle size greater than 3mm; 30% of the calcium hexaaluminate raw material with a particle size of 1-3mm; %; Calcium hexaaluminate raw material with particle size less than 88μm 8%; corundum powder with particle size less than 88μm 10%; a-Al 2 o 3 5% of fine powder; 7% of pure calcium aluminate cement; the above percentages are mass percentages; in addition, 0.10% of the total mass of the above raw materials is added to the water reducer.

Embodiment 3

[0023] The calcium hexaaluminate material includes the following raw materials: 40% of the calcium hexaaluminate raw material with a particle size larger than 3mm; 15% of the calcium hexaaluminate raw material with a particle size of 1-3mm; %; 10% of calcium hexaaluminate raw material with a particle size of less than 88 μm; 2% of corundum powder with a particle size of less than 88 μm; a-Al 2 o 3 Micropowder 10%; pure calcium aluminate cement 3%; the above percentages are mass percentages; in addition, 0.10% of the total mass of the above raw materials is added to the water reducing agent.

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Abstract

The invention discloses a tundish slag blocking wall, an impact brick and a preparation method thereof. The tundish slag blocking wall and the impact brick are made from calcium hexaluminate material,and the volume density of the calcium hexaluminate material is greater than or equal to 2.8g / cm<3>; the tundish slag blocking wall and the impact brick are made by adopting a method of a fabricated part, and when the method of a fabricated part is adopted, required materials are mixed according to pre-designed proportion in advance, and a proper amount of water and dispersing agent and the like are added, uniformly stirred, put into a fabricated part model, and dried, thus obtaining the required tundish slag blocking wall and impact brick. The tundish slag blocking wall and the impact brick have the advantages of being strong in molten steel corrosion resistant capacity, good in thermal shock resistance, long in service life and the like, and have a purifying effect for molten steel.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a tundish slag retaining wall, impact bricks and a preparation method thereof. Background technique [0002] Tundish slag retaining wall and impact brick are important refractory materials in tundish production. Due to uneven flow of molten steel in the tundish and excessive inclusions in the molten steel, it is usually necessary to install slag retaining walls and impact bricks in the tundish. Most of the existing slag retaining walls are made of a mixture of magnesia, corundum sand, and super-grade bauxite. The resulting slag retaining walls cannot achieve the best performance and may cause inclusions in molten steel. Impact bricks are mainly used in the impact area of ​​molten steel pouring in the tundish, which is intermittently impacted by high-pressure molten steel for a long time, so it requires high corrosion resistance and thermal strength. Mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66B22D41/02
Inventor 刘忠江陈俊红李斌侯新梅杜珏玉冯广
Owner WUHAN WINNING TECH