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High-Quality Fused Cast α-Alumina Block (RTK-A) from China Suppliers and Factory for Metallurgy 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℃. 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-A is composed of nearly 100% α-alumina, which has high temperature resistance, strong alkali resistance, compact structure, excellent chemical stability and strong wear resistance. Its corrosion resistance to various slags is far stronger than other aluminum silicate products, and it is an ideal material for the skid roll bricks of the metallurgy electrolyzer and heating furnace.
Chemical Composition
| CHEMICAL COMPOSITION | TYPICAL VALUE |
|---|---|
| AI₂O₃% | 98.0 |
| Na₂O% | 1.0 |
| SiO₂＋CaO＋Fe₂O₃＋TiO₂% | ≤1.0 |
Physical Property
| PHYSICAL PROPERTY | TYPICAL VALUE |
|---|---|
| Bulk density (dense part) g/cm³ | 3.4 |
| Normal temperature compression resistance MPa | 280 |
| Load softening start temperature (0.2 MPa) | 1700 |
| CALCULATE SPECIFIC GRAVITY | TYPICAL VALUE |
| PT g/cm³ | 3.1 |
| WS g/cm³ | 3.3 |
Frequently Asked Questions
What is the main composition of RTK-A fused cast alumina?
RTK-A is primarily composed of nearly 100% α-alumina, which provides exceptional chemical stability and high-temperature resistance.
At what temperature are these alumina products manufactured?
The raw materials are melted in an electric arc furnace at extreme temperatures exceeding 2000°C to ensure high purity and a compact structure.
Why is RTK-A preferred for glass furnaces?
Due to its high purity and minimal matrix glass phase, it offers excellent low contamination performance, ensuring the quality of the molten glass remains unaffected.
What are the typical applications for RTK-A bricks?
They are ideal for use as skid roll bricks in metallurgical electrolyzers, heating furnaces, and various high-wear areas in glass manufacturing.
How does RTK-A compare to other aluminum silicate products?
RTK-A features far superior corrosion resistance to various slags and stronger wear resistance compared to standard aluminum silicate refractories.
What is the typical bulk density of the dense part of RTK-A?
The typical bulk density for the dense portion of RTK-A fused cast alumina is 3.4 g/cm³.