tabular alumina sand use in glass industry
| Application | Role of Tabular Alumina Sand | Key Benefits | Specifications |
|---|---|---|---|
| Refractory Linings | Used in furnace linings, regenerators, and glass tank superstructures. | – Exceptional thermal shock resistance – High purity (≥99% Al₂O₃) – Resists molten glass corrosion | – Grain size: 0.1–3 mm – Bulk density: ~3.6 g/cm³ |
| Monolithic Refractories | Mixed into castables or ramming masses for repairs and linings in glass furnaces. | – Enhances mechanical strength – Reduces downtime during maintenance – Stable at >1700°C | – Low porosity (<3%) – High sintered strength |
| Glass Batch Additive | Added to glass batches to adjust viscosity, chemical resistance, or optical properties. | – High purity avoids contamination – Improves glass durability and clarity | – Controlled particle size (e.g., 40–100 mesh) |
| Filter Media | Used in ceramic foam filters to remove impurities (e.g., bubbles, debris) from molten glass. | – Chemically inert – Withstands molten glass temperatures – Efficient filtration | – Porous structure – Tailored grain size for flow control |
| Thermal Insulation | Incorporated into insulating materials for glass furnaces. | – Low thermal conductivity – Maintains structural integrity at high temps | – Lightweight aggregates – High alumina content |
Why Tabular Alumina Sand?
- High Purity: Minimizes contamination (critical for optical/display glass).
- Thermal Stability: Resists spalling and cracking in rapid heating/cooling cycles.
- Chemical Inertness: Does not react with molten glass or alkali vapors.
- Cost-Effectiveness: Longer lifespan than traditional refractories (e.g., silica-based materials).
Comparison to Alternatives
| Material | Advantages Over Tabular Alumina Sand | Disadvantages |
|---|---|---|
| Zirconia (AZS) | Better corrosion resistance in high-alkali glass | Higher cost, prone to phase changes at high temps |
| Silica Brick | Cheaper for lower-temperature zones | Poor thermal shock resistance, limited lifespan |
| Calcined Alumina | Lower cost for non-critical applications | Less thermal stability and mechanical strength |
In summary, tabular alumina sand is a critical material in glass manufacturing for its ability to withstand extreme temperatures, resist corrosion, and maintain structural integrity. Its applications span furnace linings, filtration, polishing, and more, making it indispensable for high-quality glass production. Let me know if you need further details!
