Andalusite Bricks Introduction
The high content of andalusite Al2O3 and low impurity content are ideal high-grade refractories material. At the same time, the volume change of andalusite refractory bricks in the sintering process is only stable. The andalusite refractory bricks have excellent low thermal conductivity, high resistance to slag corrosion and creep resistance. Refractory adalusite bricks have high heat strength, low porosity, resistance to chipping and anti transformation under pressure drop, thermal shock resistance, good refractoriness. The micro-expansion of andalusite fire bricks changes the use of materials and the extension of their service life. Andalusite refractory brick are widely used in kiln and boiler of various industrial fields such as metallurgy, building materials, fine ceramics, electric power, chemical industry, etc. Andalusite refractory brick is applied on the top of some metallurgical furnaces, and the effect is better than that of silica brick.
Andalusite Bricks Advantages
The refractory andalusite brick has a low temperature, a low conversion temperature, low thermal expansion during the conversion process, and coarse crystals, andalusite rafractory bricks can be used for the aggregates, all of which can make the andalusite can be directly used for the production of fired or unburned bricks without calcination, and saves a lot of energy.
The andalusite refractory brick has a series of advantages, andalusite bricks creep resistance is strong. The creep is a measure of the long-term resistance of the refractory brick to the high temperature load, and the melt impurities which prematurely soften the andalusite refractory bricks have a great influence on the creep.
The andalusite refractory bricks have high temperature strength is high and decreases with increasing temperature.
The high temperature strength is related to the amount of liquid phase formed inside the refractory brick at a high temperature.
Andalusite brick has high temperature and volume stability, and other AL2O3-Sio2 series refractory bricks with better thermal shock stability than Al2o3 content, strong chemical resistance
Andalusite Bricks Specification
Index
Item |
|
GX-135 |
GX-140 |
GX-150 |
| Al2O3 |
(%) ≥ |
65 |
65 |
65 |
| Fe2O3 |
(%)≤
|
1.5 |
15 |
1.0 |
| Bulk Density |
(g/cm3) ≥ |
22 |
22 |
20 |
| Apparent Porosity |
(%)≤
|
2.40 |
2.50 |
2.60 |
| Cold Crushing Strength |
(Mpa) ≥ |
60 |
60 |
80 |
| 0.2Mpa Refractoriness Under Load |
℃≥
|
1520 |
1550 |
1600 |
| Refractoriness |
℃ ≥ |
1790 |
1790 |
1790 |
| (0.2Mpa,20-50h,%)Creep rate |
(%) |
0.2 |
1400℃
0.2 |
1400℃
0.2 |
| Thermal Shock Resistance (1000℃,water,quenching,cycle) |
℃ |
15 |
20 |
20 |
Andalusite Bricks Application
1. Blast furnace
2. Hot blast stove
3. Soaking furnace
4. Shenggang bucket
5. Ladle, cement rotary kiln
6. Ceramic tunnel kiln and glass kiln
7. Lining nozzle, nozzle material
8. Torpedo tin lining
Andalusite Bricks Manufacturing Process
The andalusite fire bricks are made of andalusite as raw material, andalusite refractory bricks are added with powders such as sillimanite powder and mullite powder. The binder is added in proportion, then mullite powder, andalusite fine powder and sillimanite powder are placed in the mixed sand. Machine mixing, adding clay and mixing water of 2% of the total weight of the raw materials, then adding silicon micropowder for mixing, pressing brick into a fire brick, drying the refractory brick and putting it into a firing kiln for sintering, burning into andalusite refractory brick.
