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Fused Cast β-Alumina Block RTK-H: High-Performance Glass Refractory from China Suppliers & Factory
Brief Introduction
Fused and cast alumina products are alumina series fused and cast blocks made of high-purity alumina raw materials, which are melted in an electric arc furnace at a high temperature above 2000 °C. Due to the use of high-purity raw materials, less impurities and almost no matrix glass phase, it has excellent low contamination performance to the molten glass.
The crystal phase structure of the fused alumina series is composed of α-alumina and β-alumina, which has different composition ratios. The products of different varieties have different properties and can meet different operating conditions. According to its crystal phase structure, it is divided into α-β corundum brick (RTK-M), β-corundum brick (RTK-H) and α-corundum brick (RTK-A). Further classification shall be made according to the appearance quality specification level and casting method. These classifications can meet the different application requirements of fused cast corundum series in glass furnaces and metallurgical electrolyzers.
RTK-H is composed of nearly 100% β-alumina with a dense structure and high resistance to spalling, especially showing extremely high corrosion resistance to strong alkali vapor, almost no glass phase, and no contamination to molten glass. It can be used for superstructures with little glass raw material scattering or oxy-fuel combustion furnace, and it can give full play to its excellent performance.
Chemical Composition
| Chemical Composition | Typical Value |
|---|---|
| Al₂O₃ % | 92.5 |
| Na₂O % | 6.5 |
| SiO₂ ＋ CaO ＋ Fe₂O₃ ＋ TiO₂ % | ≤ 1 |
Physical Property
| Physical Property | Typical Value |
|---|---|
| Bulk density (dense part) g/cm³ | 2.9 |
| Normal temperature compression resistance MPa | 80 |
| Load softening start temperature (0.2 MPa) | 1700 |
| Calculate Specific Gravity | Typical Value |
| PT g/cm³ | 2.6 |
| WS g/cm³ | 2.8 |
Frequently Asked Questions (FAQ)
What raw materials are used to make fused and cast alumina products?
They are made of high-purity alumina raw materials, melted in an electric arc furnace at temperatures exceeding 2000 °C. Due to the high purity, they contain very few impurities and almost no matrix glass phase.
How are fused cast alumina products classified by crystal phase structure?
They are composed of α-alumina and β-alumina. Depending on their ratios, they are classified into α-β corundum brick (RTK-M), β-corundum brick (RTK-H), and α-corundum brick (RTK-A).
What are the unique properties of RTK-H corundum brick?
RTK-H is composed of nearly 100% β-alumina. It features a dense structure, high spalling resistance, exceptional corrosion resistance to strong alkali vapor, and causes no contamination to molten glass.
Where is RTK-H best utilized in glass furnaces?
It is highly recommended for superstructures with minimal glass raw material scattering or inside oxy-fuel combustion furnaces to leverage its maximum performance.
What is the chemical composition of RTK-H?
RTK-H typically contains 92.5% Al₂O₃, 6.5% Na₂O, and less than or equal to 1% of combined SiO₂ ＋ CaO ＋ Fe₂O₃ ＋ TiO₂.
What are the key physical properties of RTK-H?
It has a bulk density of 2.9 g/cm³, a normal temperature compression resistance of 80 MPa, a load softening start temperature of 1700 °C, and calculated specific gravity values of PT 2.6 g/cm³ and WS 2.8 g/cm³.