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HIGH & MEDIUM ALUMINA GRINDING BALLS (ALUMINA BALLS)
Introduction
High Alumina and Medium Alumina Grinding Balls (Alumina Balls) are essential grinding media manufactured from aluminum oxide (Al₂O₃) with different alumina contents, designed to meet a wide range of grinding requirements in the ceramics, paints & coatings, construction materials, chemicals, and mining industries.
1. Classification and Composition
Classification by Al₂O₃ Content
• Medium Alumina Balls : Al₂O₃ content: 68% and 75%
• High Alumina Balls : Al₂O₃ content: 92% and 95%
2. Chemical Composition
|
Parameter |
Medium Alumina Balls |
High Alumina Balls |
|
Al₂O₃ (%) |
68 – 75 |
≥ 92 / ≥ 95 |
|
SiO₂ (%) |
≤ 20 |
≤ 5 |
|
Fe₂O₃ (%) |
≤ 2.0 |
≤ 0.3 |
|
CaO + MgO (%) |
≤ 5 |
≤ 0.5 |
|
Alkali (Na₂O + K₂O) (%) |
≤ 1.5 |
≤ 0.3 |
3. Technical Specifications
|
Parameter |
68% |
75% |
92% |
95% |
|
Al₂O₃ (%) |
≥ 68.0 |
≥ 75.0 |
≥ 92 |
≥ 95 |
|
Bulk density (g/cm³) |
≥ 3.0 |
≥ 3.2 |
≥ 3.67 |
≥ 3.70 |
|
Hardness (Mohs) |
7 – 8 |
≥ 8 |
≥ 9 |
≥ 9 |
|
Water absorption (%) |
≤ 0.02 |
≤ 0.02 |
≤ 0.01 |
≤ 0.01 |
|
Wear loss (%) (24 hours) |
≤ 0.003 |
≤ 0.002 |
≤ 0.001 |
≤ 0.0005 |
|
Compressive strength (MPa) |
≥ 1700 |
≥ 1800 |
≥ 2000 |
≥ 2000 |
|
Color |
Yellowish |
Ivory |
White |
White |
|
Standard ball diameter Φ (mm) |
30; 40; 50; 60; 70 |
20; 25; 30; 40; 50; 60; 70 |
1–14; 15; 20; 25; 30; 40; 50; 60; 70 |
|
|
Cylindrical size |
– |
– |
Φ12×12; Φ21×21; Φ32×32; Φ32×40 |
|
|
Packing |
25 kg/bag – approx. 27 MT/20’ FCL (no pallet) | Jumbo bag 1300 kg – 2 bags/pallet – approx. 26 MT/container |
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4. Typical Applications
🔹 Medium Alumina Balls (68% – 75%)
- Grinding ceramic bodies, tiles, and sanitary ware
- Grinding dark-colored raw materials
- Industrial paints and pigments
- Minerals and mineral powders
- Ideal for large-scale production with optimized cost
🔹 High Alumina Balls (92% – 95%)
- Grinding ceramic glazes, engobes, white bodies, Zircon Silicat, Sand and mineral process.
- Products requiring high whiteness and purity
- Advanced and high-performance materials
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