| Product Name: | Alumina Grinding Ball Alumina Grinding Media Ball |
|---|---|
| Material: | Alumina Ceramic |
| Size: | 3-70 mm |
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Alumina ceramic grinding balls are ultra-dense, high-purity spheres engineered from ≥92% aluminum oxide (Al2O3). Designed for abrasive and corrosive environments, they deliver superior grinding efficiency, near-zero contamination, and exceptional wear resistance in size reduction, dispersion, and mechanical alloying processes. Ideal for sensitive chemical applications where metal leaching or silica contamination is unacceptable.
Key Advantages:
*Chemical Inertness: Resists acids (H2SO4, HCl), alkalis (NaOH, KOH), and solvents.
*Extreme Hardness: Mohs 9 hardness for aggressive grinding without fracturing.
*Low Contamination: ≤1 ppm metal ion leaching (critical for batteries/pharma).
*Thermal Stability: Operates from -196°C to +1,550°C (cryogenic to kiln temperatures).
| Parameter | Specification Range |
|---|---|
| Alumina Content (Al2O3) | 92%, 95%, 99% (Customizable) |
| Density | 3.65-3.90 g/cm³ |
| Hardness (Mohs Scale) | 9 |
| Compressive Strength | ≥2,500 MPa |
| Wear Rate | ≤0.1-0.2% (per 100 hrs, silica slurry) |
| Size Range | Ø3-60 mm (Common: 3/6/13/20/25/30 mm) |
| Size Tolerance | ±1 mm (Precision-classified) |
| Roundness/Sphericity | >95% |
| Surface Roughness (Ra) | ≤0.2 µm (Mirror-polished option) |
| Water Absorption | ≤0.2% (Fully sintered) |
| Crush Resistance | ≥1,000 cycles (1 m drop test) |
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Item
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high alumina ceramic grinding ball
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middle alumina ceramic grinding ball
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micro crystal middle alumina
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carborundum middle alumina
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Al2O3(%)
|
92% Al2O3
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95% Al2O3
|
65-75% Al2O3
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60-70% Al2O3
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SiO2(%)
|
3.81
|
3
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20-15
|
|
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Fe2O3(%)
|
0.06
|
0.05
|
0.41
|
<0.5
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TiO2(%)
|
0.02
|
0.04
|
1.7
|
1.8
|
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Other
|
2.53
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1.9
|
5
|
10
|
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Bulk density kg/m3
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3.65
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3.68
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2.93-3.0
|
2.90-3.0
|
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Water absorption
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max 0.01
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max 0.005
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max 0.01
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max 0.05
|
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Moh's hardness
|
9
|
9
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min 8
|
min 8
|
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Compressium strength
|
2000
|
2100
|
1000
|
1000
|
|
Abrasion
|
0.01
|
0.0084
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0.02
|
0.03
|
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Color
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white
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white
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yellow/white
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brown
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Raw material
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calcined alumina
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calcined alumina
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refined bauxite powder
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bauxite powder
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Forming method
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Isostatic pressing
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Isostatic pressing
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impact briquetting
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handmade
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*Consistent Quality: Laser-sorted for size/sphericity uniformity.
*Tailored Solutions: Custom sizes (3-60 mm) and Al2O3 grades (92-99%).
*Technical Support: Grinding efficiency audits and mill optimization guidance.
*Global Logistics: FOB/CIF pricing with hazardous material certification.
| Application | Recommended Ball Size | Mill Speed (RPM) | Filling Ratio |
|---|---|---|---|
| Nano-Grinding (<1 µm) | 3-6 mm | 300-500 | 30-40% |
| Fine Grinding (1-20 µm) | 13-20 mm | 200-400 | 40-50% |
| Coarse Grinding (>20 µm) | 25-40 mm | 100-300 | 50-65% |
Critical Notes:
*Use with alumina/rubber-lined mills - avoid mixed media (e.g., steel).
*For wet grinding: Max. slurry density ≤80% solids.
*Clean with NaOH solution to remove residues.
Primary Applications in Chemical Industry:
*Catalyst Processing: Crushing & homogenizing catalyst pellets (e.g., FCC, hydroprocessing).
*Fine Chemical Synthesis: Grinding dyes, pigments, and specialty polymers.
*Battery Material Production: Nano-grinding Li-ion cathode/anode powders (LFP, NMC).
*Mineral & Fertilizer Processing: Size reduction of phosphate, potassium salts, and quartz.
*Pharmaceuticals: Contamination-free milling of APIs and excipients.
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