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Calcined α-alumina physical and chemical indicators
classification | Product type | Chemical Composition % | effective density g/cm3 ≥ | grain size 1 (median particle diameter ) D50,μm | ||||
Al2O3 ≥ | SiO2 ≤ | Fe2O3 ≤ | Na2O ≤ | Calcined ≤ | ||||
Mid Na type | AC-30 | 99.0 | 0.10 | 0.04 | 0.3 | 0.20 | 3.93 | 4±1 |
AC-30A | 99.0 | 0.10 | 0.04 | 0.3 | 0.20 | 3.93 | 2.5±1 | |
ACG-2A | 98.5 | 0.20 | 0.04 | 0.3 | 0.25 | 1∼3 | ||
Note: 1) Grain size determination - Grinding 24 minutes (dry grinding), the ball material ratio 10:1, using laser particle size analyzer (MS2000) ,measureing median diameter (D50). normally it needs ultrasound for 1 minute and then to be measured.
A means activity (Activated), suitable for production of grinding media.
M means a smaller microcrystalline product than grain size
Activated alumina