High-alumina checker bricks are mainly made of bauxite clinker and other materials after high-temperature mixing, forming, drying and sintering.
Its main component is alumina. It is a heat transfer and heat storage body with many excellent thermal characteristics such as strong heat exchange capacity, large heat storage area, smooth ventilation and low resistance.
(1) Good volume stability;
(2) Excellent high temperature load creep performance;
(3) High density, low porosity;
(4) Strong heat exchange capacity and large heat storage area;
(5) Strong pressure resistance and good corrosion resistance;
(1) Mainly used for the partition walls of the carbonization chamber and combustion chamber of the coke oven, the heat storage chamber and slag chamber of the steelmaking open hearth furnace, the soaking furnace, the refractory materials of the glass melting furnace and the vault and other load-bearing parts of the ceramic firing kiln.
(2) Also used for the high-temperature load-bearing parts of the hot blast furnace and the top of the acid open hearth furnace.
|
Item |
High Alumina Checker Brick |
Micro-expansion high alumina bricks |
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|
Grade |
RSGL-75 |
RSGL-65 |
RSGL-55 |
RSWPL-75 |
|
|
Chemical element content% |
Al2O3≥ |
75 |
65 |
55 |
75 |
|
Fe2O3≥ |
2.0 |
2.0 |
2.5 |
2.0 |
|
|
Refractory degree/℃,≥ |
1790 |
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|
Load softening start temperature/℃,0.2MPa |
1500 |
1470 |
1450 |
1520 |
|
|
Apparent porosity/%≤ |
20 |
22 |
23 |
19 |
|
|
Compressive strength at room temperature/MPa,≥ |
60 |
55 |
40 |
70 |
|
|
Volume density/(g/cm3),≥ |
2.5 |
2.4 |
2.3 |
2.6 |
|
|
Linear change rate/%,(1500℃×2h) |
0—0.2 |
0—-0.2 |
±0.2 |
0-0.6 |
|
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