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Andalusite Bricks for Hot Blast Stove

Andalusite Bricks for Hot Blast Stove

Andalusite Brick for Hot Blast Stove: Andalusite is heated to 1300 ℃ and becomes mullite. It is a high-grade refractory, which is the same as kyanite.
In the process of heating andalusite into mullite, a good mullite network can be formed, and the volume expansion is about 4%. This is an irreversible crystal transformation. Once transformed, it has higher fire resistance. The fire resistance can reach above 1800 ℃, and it has high resistance to sudden cooling and heat, high mechanical strength, strong thermal shock resistance, strong slag resistance, high load conversion point, high chemical stability (even insoluble in hydrofluoric acid) and strong chemical corrosion resistance.

Andalusite bricks are a type of refractory product that have been gaining attention since the 1970s for their high performance in various industrial applications. These bricks are primarily made of al2o3 (alumina) and possess a range of properties that make them suitable for high-temperature and demanding environments. Here’s a comprehensive overview of andalusite bricks, including their production, properties, and applications:

Andalusite Brick

Production Process

  1. Raw Materials: The primary materials used for making andalusite bricks include mullite powder, andalusite fine powder, sillimanite fine powder, clay, and silicon micropowder.
  2. Manufacturing Process: The production involves mixing these raw materials in a sand mixer following a specific formula. After mixing, the mixture is shaped into bricks using a brick press. These bricks are then dried and fired in a kiln to produce the final andalusite refractory bricks​​.

 

Properties of Andalusite Bricks

  1. High-Temperature Resistance: Andalusite bricks can withstand temperatures above 1800 °C. Upon heating, they convert into mullite, enhancing their fire resistance.
  2. Thermal Expansion: They exhibit low thermal expansion during the conversion process to mullite.
  3. Mechanical Strength: These bricks maintain strength under high-temperature conditions and are resistant to rapid cooling and heating.
  4. Chemical Stability: Andalusite bricks are chemically stable, resistant to chemical attack, and even insoluble in hydrofluoric acid.
  5. Thermal Shock Resistance: They have strong thermal shock resistance and high load conversion points.
  6. Low Porosity and Creep Rate: The bricks exhibit low porosity and a low rate of creep under high temperatures​​.

 

Applications

Andalusite bricks have a wide range of applications due to their high refractoriness under load, low porosity, and excellent thermal shock resistance. They are used in:

  • Bodies of hot stoves.
  • Torpedo cars.
  • Ladles.
  • Glass furnaces.
  • Roofs of electric furnaces.
  • Heating furnaces​​.

 

In summary, andalusite bricks are a versatile and robust refractory solution. Their superior thermal and chemical stability, combined with high mechanical strength and resistance to thermal shock, make them ideal for use in various high-temperature industrial applications. Their ability to transform into mullite under heat contributes to their high refractoriness and durability, making them a preferred choice in metallurgy and other related industries.

OSYMEN BRAND

Al2O3

Fe2O3,

TiO2

A.P

B.D

CCS

PLC

Creep

(0.2MPa, 0~50h)

RUL

1450oCX2h

1500oCX2h

%

%

%

%

g/cm3

MPa

%

%

%

oC

RH-130

49.0

1.5

0.6

20

2.40

40

±0.2

 

0.8

1300oC

1450

RH-135

53.0

1.5

0.6

20

2.45

40

±0.2

 

0.8

1350oC

1520

RH-140

57.0

1.2

0.6

20

2.50

50

±0.2

 

0.8

1400oC

1600

RH-145

61.0

1.2

0.5

20

2.55

50

 

±0.2

0.8

1450oC

1650

RH-150

65.0

1.0

0.5

20

2.55

55

 

±0.2

0.8

1500oC

1700

RH-155

69.0

1.0

0.5

20

2.60

55

 

±0.2

0.8

1550oC

1700

AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  PLC: Permanent Linear Change

Last updated: 2024-01-03
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