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Castable for slag line brick

A castable and slag line technology, which is applied in the field of castables for slag line bricks, can solve the problems of unfavorable slag absorption and low strength, and achieve the effects of favorable absorption, long service life and low cost

Active Publication Date: 2014-12-10
CHANGXING FUZILING SPECIAL FIRE RESISTANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that existing tundish slag lines have defects such as low strength and unfavorable slag absorption, thereby providing a castable for slag line bricks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A castable for slag line bricks, consisting of the following components in weight percentage: 3-6mm magnesia 36.42%, 0-3mm magnesia 39.18%, magnesia fine powder 8.02%, alumina 1.38%, boron carbide 0.02% , Graphite 11.95%, resin 3.03%.

Embodiment 2

[0013] A castable for slag line bricks, which is composed of the following components by weight percentage: 3~6mm magnesia 37.21%, 0~3mm magnesia 38.45%, magnesia fine powder 7.8%, alumina 1.5%, boron carbide 0.01% , Graphite 12.4%, resin 2.63%.

Embodiment 3

[0015] A castable for slag line bricks, consisting of the following components in weight percentage: 3-6mm magnesia 38.19%, 0-3mm magnesia 35.37%, magnesia fine powder 8.36%, alumina 1.81%, boron carbide 0.03% , Graphite 12.83%, resin 3.41%.

[0016] The content of MgO in the 3-6mm magnesia is 97%, the content of MgO in the 0-3mm magnesia is 97%, the fixed carbon content in the graphite is 95%, and the MgO in the fine magnesia powder The content of slag line brick is 98%, which is conducive to the stable structure of the mixed slag line brick, good practical performance, high strength, long service life and good corrosion resistance.

[0017] 3~6mm magnesia, 0~3mm magnesia, fine magnesia powder, alumina, boron carbide, graphite, and resin are mixed into castable for slag line bricks to produce slag line bricks with good thermal shock resistance. It has the best thermal strength at working temperature and can effectively absorb Al in inclusions 2 O 3 Forming spinel on the surface h...

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PUM

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Abstract

The invention relates to a castable for a slag line brick. The castable comprises the following components in percentage by weight: 36.42-39.41% of 3-6mm magnesite, 35.37-40.62% of 0-3mm magnesite, 7.67-8.36% of fine magnesite powder, 1.38-1.97% of aluminium oxide, 0.01-0.03% of boron carbide, 11.73-12.83% of graphite and 2.63-3.41% of resin. The castable has the advantages that: the castable for the slag line brick is synthesized from 3-6mm magnesite, 0-3mm magnesite, fine magnesite powder, aluminium oxide, boron carbide, graphite and resin in a mixing manner; the produced slag line brick has good thermal shock resistance and optimal hot strength at working temperature, and is capable of effectively absorbing Al2O3 in occluded foreign substances, so as to form spinelle on the surface; and the castable has the characteristics of low cost and long service life, is capable of effectively removing a dead zone in a bottom region and improving the flow track of molten steel, and is beneficial to absorption of slag.

Description

Technical field [0001] The invention relates to a castable for slag line bricks. Background technique [0002] In the process of steel smelting, due to the uneven flow of molten steel in the tundish, some places are fast and some are slow, especially the inactive molten steel stagnation area at the bottom of the tundish, making it difficult for inclusions to float up, and the molten steel in the tundish The actual average residence time is shorter than the theoretical average residence time. In order to make full and effective use of the tundish volume and promote the floating of debris, the tundish slagging line is adopted. The existing slag lines mostly use magnesia and corundum. It is made of mixed sand, which makes the finished slag retaining wall low in strength, unable to achieve the best thermal strength, and has a low service life. It cannot effectively eliminate the dead zone in the bottom area of ​​the tundish and affect the trajectory of molten steel flow. Conducive t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 谈利强
Owner CHANGXING FUZILING SPECIAL FIRE RESISTANT
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