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Aluminium oxide

 
Synonyms:

Aluminium oxide, (Di) aluminium (III) oxide, Aluminium (III) oxide, Calcined Alumina, Calcinata alumina, Kalcinirana glinica

 
CAS No: 1344-28-1
EINECS No: 215-691-6
Chemical formula: Al2O3
 
The main applications for calcined aluminas include: refractories, glass and enamel, mechanical, electric and electronic ceramic. Feedstock for the manufacture of aluminium metal and various aluminium oxide based materials e.g. tabular alumina, fused alumina, bubble alumina, sintered alumina, Spinel, Mullite, calcium aluminate cement, beta-alumina, zirconia alumina. Manufacture of ceramics, tiles, porcelain, hotel-ware, refractories, abrasives, polishing and cleaning compounds, wear parts, brake linings, electrical insulating materials, spark plugs, fillers, toothpaste, cosmetics. Media for sand blasting and heat treatment.

The diversity of applications for calcined aluminas can be explained by the surprising range of properties that can be obtained depending on their quality. These include their purity, refractoriness, sinterability, chemical inertness in both oxidizing and reducing environments and in both acidic and basic environments, hardness, wear and abrasion resistance, mechanical resistance in heat, dimensional stability, high thermal conductivity, transparency, electric resistivity, low dielectric loss and high permittivity, ionic conductivity of beta alumina.
 
Calcined alumina

Aluminas with intermediate to relatively high specific surface areas (BET 3- 75m²/g) with alpha alumina contents varying between 20% and 95%.These are produced by controlled rotary calcination of aluminium trihydroxide.
 
Ground calcined alumina

These aluminas are ground in continuous ball-mills or air-jet mills to median particle sizes (d50) 3, 4, 5 or 6 µm.
 
Hard calcined alumina

These aluminas have low specific surface area (BET < 1m²/g) and are almost entirely alpha alumina. Standard soda content is 3000-4000 ppm and intermediate soda content is 2000-3000 ppm. Hard calcined aluminas are produced in rotary kilns.
 
Low soda alumina
This alumina has very low soda content: between 300 and 500ppm. Carefully controlling calcination using the proprietary Reynolds process also allows a wide range of primary crystal size to be offered.

 

Superground low soda alumina

These low soda aluminas are ball-milled to their primary crystal size, which ranges from 0.4 to 2.5 µm. Soda contents are between 300 and 500ppm.
 
Electrocorund

Electrocorundum is a white purified synthetic crystalline alumina powder. It is distinguished by its high hardness and cutting ability.
 
Packaging: Sacks of 25 kg.

 





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