Arc Fused Alumina
Corundum crystals melted in 2000℃ electric arc furnace provide the bottom layer guarantee for the life of refractory materials and grinding efficiency
Product Essence
This is not ordinary alumina powder, but single crystal corundum that is melted and recrystallized from bauxite at ≥2000℃. Its characteristics are derived from:
Crystal growth
Slow cooling to form 10-400μm complete α-Al₂O₃ crystals
Natural impurity removal
Fe/Si and other impurities float and separate during smelting (purity 95-99.5%)
Fractometry control
Multi-angular particles are produced after crushing (enhanced grinding/bonding performance)
Technical Parameters
Typical composition:
- Brown corundum: Al₂O₃ 94-97% | TiO₂ 1.5-3.5% (toughening) 丨SiO₂ 1-2%
- White corundum: Al₂O₃ 99.2%↑ | Na₂O ≤0.3% (sodium control to prevent explosion)
Physical properties:
- Mohs hardness: 9.2 (second only to diamond)
-Bulk density: 1.7-1.9 g/cm³ (affects the rheology of castables)
- Magnetics: <0.02% (key indicator for precision polishing)
Why choose electrofusion instead of sintering?
Product Comparison
Comparison between electrofusion and sintering
| Comparison items | Fused alumina | Sintered alumina |
| Crystal structure | Complete single crystal | Polycrystalline aggregate |
| Thermal shock stability | 1700℃↔room temperature 15 times without cracking | Usually <10 cycles |
| Grinding tool life | Grinding wheel durability ↑35% | Easy to passivate and fall off |
Application scenarios
Scenario 1: Batching section of a refractory material plant
"When your ladle castable needs to resist 1600℃ molten steel erosion:
Add 8-15% 3-5mm fused brown corundum aggregate
Corrosion resistance is 2.3 times higher than sintered corundum
Reference to a steel company case: Ladle life from 85 times to 122 times
Scene 2: Abrasive products production workshop
"When processing high nickel alloys (such as Inconel 718):
Use F80 white corundum grinding wheel
Reduced adhesion by 70% compared with silicon carbide abrasives
Measured data: Surface Ra value dropped from 1.2μm to 0.6μm
Production and quality control (real details)
Raw material traceability
Bauxite: Henan Sanmenxia Grade A mine (Al₂O₃≥85%, low potassium and sodium)
Smelting process
36 hours melting process → 72 hours natural cooling → jaw crusher + roller crusher
Particle size control
Raw material → coarse crushing → magnetic separation and iron removal → screening and grading → air flow shaping
FAQ
If you are:
Designing a high-temperature kiln lining solution
Looking for a cost-effective aggregate to replace zirconium corundum
Solving the problem of carbide grinding and sand sticking
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