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Air permeability refractory materials for bakie air curtain barricade wall

An air curtain retaining wall and refractory technology, which is applied in the field of air curtain retaining wall refractories for iron and steel metallurgy tundish, can solve the problems of large bubble diameter, low labor productivity, complex manufacturing process and equipment, etc., and achieve good material strength and The effect of fire resistance and good service life

Inactive Publication Date: 2008-04-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacturing process and equipment of these two types of methods are relatively complicated, the labor productivity is low, and the diameter of the air bubbles produced by the obtained gas permeable refractory material is large (more than 1.5mm in the water model measurement), which cannot well meet the requirements of the tundish air curtain barrier. The wall requires fine and dense air bubbles

Method used

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  • Air permeability refractory materials for bakie air curtain barricade wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Table 2 shows the performance of a 60-ton tundish air curtain retaining wall made by adding 0.25wt% organic fiber to the low-cement aluminum spinel dense castable.

[0030] Table 2 shows the permeable refractory materials for low-cement aluminospinel air curtain retaining walls.

[0031] Table 2

[0032] Element

[0033] Al-Mg spinel powder-0.10mm

[0034] According to the performance measurement results of the gas-permeable refractory material for the retaining wall, the performance of the material is excellent. Using an appropriate amount of organic fiber to produce air holes has no obvious effect on the performance of the refractory material, and its fire resistance performance can well meet the needs of the working conditions under the condition of tundish scouring by molten steel, and the air curtain wall made of it is breathable The capacity matches the requirements of tundish metallurgy.

Embodiment 2

[0036] Table 3 shows low-cement mullite air-permeable refractory materials for air curtain retaining walls.

[0037] table 3

[0038] Element

[0039] Aluminate cement secar71

Embodiment 3

[0041] Table 4 shows the low-cement and high-aluminum air-permeable refractory materials for air curtain retaining walls.

[0042] Table 4

[0043] Element

unit

Super high bauxite 1~0.5mm

Wt%

26

0.5~0mm

Wt%

28

-0.1mm

Wt%

18

Kyanite powder-0.154mm

Wt%

7

Mullite powder-6μm

Wt%

9

Activated alumina powder CTC20

Wt%

6

Silica powder

Wt%

3.5

Aluminate cement secar71

Wt%

3.5

Organic fiber KDF-II

<Φ0.05×4~6mm

Wt%

plus

0.45

Water reducer sodium hexametaphosphate

Wt%

plus

0.15

Bulk density

g / cm3

2.72

Apparent porosity

％

25.5

[0044] Specific air flow

1min-1cm-2

0.112

Ventilation

l / min

60.5

Flexural strength

MPa

7.5

Compressive strength

MPa

31.3

High temperature b...

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Abstract

A ventilate corhart with gas screen wall comprises a castable refractory and 0.08 to 0.45 weight percent of organic fiber. A gas screen wall is made in the way of vibration pouring. The kernels of the castable refractory comprise fine particles which are less than or equal to 1 millimeter. The fine particles which have the granularity of 0 to 1 millimeter are in ratio of 45 to 55 percent, the rest are powder and micro powder which are less than 0.21 millimeter. The diameter of the organic fiber is less than 0.05 millimeter, and the length of the organic fiber is 4 to 6 organic fiber. The castable refractory not only keeps the originally simply vibration pouring molding characteristics and fine refractory characteristics but also form a micro-pore channel which is easy to control in the body.

Description

technical field [0001] The invention relates to a refractory material for an air curtain retaining wall used in a steel metallurgical tundish. Background technique [0002] In recent years, the research, development and application of high-purity steel production technology have been widely valued and continuously explored and practiced. Among them, the purification process of molten steel in the tundish has become a key link for preventing secondary pollution of molten steel and improving the purity of molten steel. The process technology of setting the air curtain wall in the tundish, the inert gas is blown into the molten steel in the tundish through the air curtain wall ventilation element made of permeable refractory material, so that it produces a small bubble curtain, and these small bubble curtains can remove the inclusions The substances are brought from the inside of the molten steel to the surface, and are absorbed by the slag layer to achieve the purpose of remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/52B28B1/08
Inventor 陈荣荣何平显
Owner BAOSHAN IRON & STEEL CO LTD
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