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Fused Cast α-β-Alumina Block RTK-M - Top China Suppliers & Factory for High-Grade 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-M is composed of about 50% each of α-alumina and β-alumina, and the interlocking of the two crystals forms a very dense structure with excellent resistance to strong alkalis.
Its resistance to erosion of molten glass is comparable to that of AZS in the temperature range below 1350℃. Since it contains almost no impurities such as Fe₂O₃ and TiO₂, the matrix glass phase is very small, and it has the excellent property of not contaminating the molten glass by minimizing the occurrence of foreign matter such as bubbles when in contact with the molten glass.
Therefore, it is the most suitable for working pool wall, pavement, material channel and channel of high-grade glass furnace.
Chemical Composition
| Chemical Composition | Typical Value |
|---|---|
| Al₂O₃ % | 94.0 |
| Na₂O % | 4.0 |
| SiO₂ ＋ CaO ＋ Fe₂O₃ ＋ TiO₂ % | ≤ 2.0 |
Physical Property
| Physical Property | Typical Value |
|---|---|
| Bulk density (dense part) g/cm³ | 3.4 |
| Normal temperature compression resistance MPa | 240 |
| Anti-molten glass erosion speed under static condition mm/24h (Ordinary soda lime glass, 1350°C x 48h) | 0.2 |
| Calculate Specific Gravity | Typical Value |
| PT g/cm³ | 3.1 |
| WS g/cm³ | 3.3 |
Frequently Asked Questions (FAQ)
Q1. What are fused and cast alumina products made of?
They are alumina series fused and cast blocks manufactured from high-purity alumina raw materials, which are melted in an electric arc furnace at extremely high temperatures exceeding 2000°C.
Q2. What is the crystal phase structure of RTK-M?
RTK-M consists of approximately 50% α-alumina and 50% β-alumina. The interlocking of these two crystals forms an exceptionally dense structure providing excellent resistance to strong alkalis.
Q3. Why do RTK-M blocks prevent contamination of molten glass?
Because RTK-M contains almost no impurities like Fe₂O₃ and TiO₂, the matrix glass phase is minimal. This prevents the formation of foreign matter or bubbles when in contact with molten glass, ensuring zero contamination.
Q4. Where are RTK-M corundum bricks typically applied?
They are highly suitable and recommended for the working pool walls, pavements, material channels, and channels of high-grade glass furnaces.
Q5. What is the typical chemical composition of RTK-M?
RTK-M typically contains 94.0% Al₂O₃, 4.0% Na₂O, and less than or equal to 2.0% of SiO₂ + CaO + Fe₂O₃ + TiO₂.
Q6. What are the physical properties of RTK-M?
It features a bulk density (dense part) of 3.4 g/cm³, a normal temperature compression resistance of 240 MPa, and an anti-molten glass erosion speed of 0.2 mm/24h under static conditions (ordinary soda lime glass, 1350°C x 48h).