Carbon titanium combining self-protection brick for blast furnace hearth and furnace bottom

A technology of furnace bottom and carbon titanium, which is applied in the field of refractory materials, can solve the problems of reducing refractory performance, difficulty in longevity, and difficulty in judging service life, etc., and achieves the effect of high thermal conductivity

Active Publication Date: 2013-02-13
ZHENGZHOU ANNEC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Carbon titanium combining self-protection brick for blast furnace hearth and furnace bottom
  • Carbon titanium combining self-protection brick for blast furnace hearth and furnace bottom
  • Carbon titanium combining self-protection brick for blast furnace hearth and furnace bottom

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Experimental program
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Effect test

Embodiment 1

[0073]

Embodiment 2

[0075]

[0076] Comparison of its products with domestic and foreign ceramic cup materials and carbon brick performance indicators:

[0077]

[0078] Through the above comparison, it can be concluded that this product has four major characteristics: (1) microporous, with an average pore diameter of ≤0.10 μm, and a pore volume of ≤1 μm ≥85%, which is the same as ultra-microporous carbon bricks and microporous corundum bricks; (2) thermal conductivity , 600 ℃ thermal conductivity ≥ 14W / m K, like microporous carbon bricks and ultra-microporous carbon bricks; (3) resistance to molten iron corrosion ≤ 0.5%, like microporous corundum bricks and composite brown corundum bricks; (4 ) has the function of titanium ore furnace protection, TiO 2 ≥5% Ti(C.N) is formed in the brick. Therefore, this product can replace the existing carbon bricks as the inner lining of hearth and furnace bottom.

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Abstract

The invention discloses a carbon titanium combining self-protection brick for a blast furnace hearth and a furnace bottom. By special ingredient proportioning, the carbon titanium combining self-protection brick has micropores and high thermal conductivity of microporous carbon bricks, molten iron corrosion resistance anti-scouring performance of a ceramic cup material and the effects of a titanium ore protecting furnace, can solve the problems that the blast furnace hearth is burnt through frequently in recent years and the furnace bottom is too high in warming speed and short in service life, and is expected to become a substitute product for a carbon brick for a blast furnace.

Description

technical field [0001] The invention relates to a refractory material used for blast furnace hearth and furnace bottom. Background technique [0002] Harsh working conditions and short service life of refractory materials used in ironmaking blast furnace hearth and furnace bottom are one of the weak links affecting the overall service life of blast furnaces. The existing refractory materials and structures used in blast furnace hearth and furnace bottom are basically divided into two categories: one is microporous and ultra-microporous carbon brick lining, and the other is oxide ceramic cup and carbon brick composite lining. [0003] The advantages of microporous and ultramicroporous carbon bricks are that carbon materials are difficult to wet, slag iron is difficult to penetrate, and heat conduction is good (thermal conductivity 13-30W / m·k). It can push the slag-iron coagulation isotherm (1150°C) into the furnace, that is, a solid protective film is formed at the place whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 李富朝孙庚辰陈泉锋
Owner ZHENGZHOU ANNEC IND
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