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High-Quality Fused Cast β-Alumina Block (RTK-H) from China Suppliers & Factory for Superior Glass Applications
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) °C | 1700 |
| CALCULATE SPECIFIC GRAVITY | TYPICAL VALUE |
| PT g/cm³ | 2.6 |
| WS g/cm³ | 2.8 |
Frequently Asked Questions
What are fused and cast alumina products?
They are alumina series blocks manufactured by melting high-purity alumina raw materials in an electric arc furnace at temperatures exceeding 2000 °C. They offer low contamination to molten glass due to minimal impurities.
How are these corundum bricks classified by crystal structure?
Based on crystal phase composition, they are classified into α-β corundum brick (RTK-M), β-corundum brick (RTK-H), and α-corundum brick (RTK-A).
What are the primary characteristics of RTK-H corundum brick?
RTK-H consists of nearly 100% β-alumina, featuring high resistance to thermal spalling, excellent resistance to strong alkali vapor, and zero contamination to molten glass.
Where is the RTK-H brick typically applied in industrial furnaces?
It is ideal for superstructures with minimal glass raw material scattering and in oxy-fuel combustion furnaces where alkali vapor corrosion is severe.
What is the typical chemical composition of RTK-H?
RTK-H typically contains 92.5% Al₂O₃, 6.5% Na₂O, and less than or equal to 1% of mixed SiO₂, CaO, Fe₂O₃, and TiO₂.
What are the key physical properties of these alumina products?
They feature a typical bulk density of 2.9 g/cm³, a normal temperature compression resistance of 80 MPa, and a load softening start temperature of 1700 °C under 0.2 MPa.