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Application of Andalusite Brick in Hot Air Furnace

2019-11-26

Hot air furnace bricks, which are high temperature structural materials, have very strict requiement for the rate of high temperature creep. Similar to sillimanite. Andalusite has excellent high-temperature structural strength properties. The following table shows the performance comparison between andalusite and mullite, bauxite, corundum and other refractory products. From the table, it is proved that the andalusite's rate of high temperature creep is better than bauxite, corundum and most of the mullite bricks. Andalusite is one of the ideal materials for low creep refractories. 

 

Comparison of Refractory Materials for Blast Furnace Hot Blast Furnace 

 

 

Material

 

 

country

Chemical analysis W/%

 

Auxiliary oxide/ %

Flexural strength

/Mpa (1500)

Creep rate %

(1300℃,50h)

 

SiO2

 

Al2O3

 

Fe2O3

 

0.2MPa

 

0.42MPa

Corundum

Japan

8.1

90.5

0.5

0.4

2.17

0.23

0.29

Corundum

South Africa

9.5

87.8

1.0

1.6

3.16

0.18

0.46

Mullite

Japan

26.6

70.5

1.5

1.4

6.68


0.24

Mullite

Japan

24.4

73.0

1.5

1.1

5.27


0.04

Mullite

South Africa

24.5

72.5

1.0

2.1

4.22

0.20

0.25

Bauxite

South Africa

11.6

83.6

1.3

3.5

1.05

0.64

0.80

Andalusite

South Africa

39.5

58.3

1.3

0.9

3.94

0.12

0.25

Andalusite

Alumina

 

South Africa

 

31.5

 

67.0

 

1.0

 

0.8

10.62

0.08

0.10

 

The above shows that low creep andalusite bricks will become more and more popular. In addition, it has small volume expansion associated with mullitary process during high temperature, rapid temperature change resistance, good thermal shock resistance and good erosion resistance, etc. It will also have broad prospects in other fields, and the development and production of our andalusite will provide high-quality functional raw materials for the domestic and international refractories industry!

 

 


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