High-strength wear-resistant castable is composed of special high-alumina bauxite, silicon carbide, corundum powder, high-alumina powder, and high-strength binder. Sintered high-alumina bauxite and fused corundum are prepared, some with black silicon carbide, and the binder is high-purity calcium aluminate cement plus silicon oxide powder. The aluminum content of high-strength wear-resistant refractory castables used in circulating fluidized bed boilers in power plants is very high, generally above 70%, and the maximum operating temperature reaches 1500.
Generally, high-strength wear-resistant refractory castables for alumina suspension roasting furnaces have similar physical and chemical performance requirements to those of wear-resistant refractory castables for circulating fluidized bed boilers, but silicon carbide is not added to the ingredients.
High-strength wear-resistant refractory castables are used in oil refining catalytic cracking units: fused or sintered white corundum is used as aggregate, high-purity calcium aluminate cement plus reactive alumina is used as a binder, and the Fe2O3 content in the castable is required to be less than 0.05%.
The steel spout of the heating furnace uses high-strength wear-resistant refractory castables: fused corundum (brown corundum or sub-white corundum) is used as aggregate, and the powder is composed of fused corundum powder, α-AL2O3 powder, SiO2 powder, Cr2O3 powder (or zircon powder) and pure calcium aluminate cement.
Product performance:
Low thermal conductivity, low heat capacity, thermal shock resistance;
Strong resistance to slag permeability, good air tightness;
Resistant to scouring, wear and corrosion, high operating temperature, long life, convenient and rapid construction.
High strength wear-resistant castable
|
project |
Numeric |
|
|
Refractoriness ℃ |
＞1730 |
|
|
Bulk density g/cm3 |
2.7 |
|
|
Compressive strength MPa |
110℃烘后 |
＞130 |
|
110℃ |
＞135 |
|
|
1350℃ |
＞135 |
|
|
Flexural strength MPa |
110℃烘后 |
＞12 |
|
1100℃ |
＞14 |
|
|
1350℃ |
13 |
|
|
Re-firing line changes % |
0.18 |
|
|
Thermal shock stability |
42 |
|
|
Working temperature℃ |
1450 |
|
|
Wear resistance cc |
＜6 |
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