| CAS No.: | 1344-28-1 |
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| Formula: | Al2O3 |
| EINECS: | 215-691-6 |
| Classification: | Alumina |
| Grade Standard: | Industrial Grade |
| Kind: | Amphoteric Oxide |
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| Customization: |
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If aluminium hydroxide is heated to a temperature in excess of 1100ºC, then it passes through the transition phases ,The final product, if a high enough temperature is used, is α-alumina. The manufacturing process is commercially undertaken in long rotary kilns. Mineralisers are frequently added to catalyse the reaction and bring down the temperature at which the α-alumina phase forms; fluoride salts are the most commonly used mineralisers.
These calcined products are used in a wide range of ceramic and refractory applications. The main impurity present is sodium oxide. Various grades are produced which differ in crystallite size, morphology and chemical impurities.
The calcined grades are often sub-divided into ordinary soda, medium soda (soda level 0.15-0.25% wt%) and low soda.
Many applications, particularly in the electrical/electronic areas, require a low level of soda to be present in the aluminum oxide. A low soda alumina is generally defined as with a soda content of <0.1% by weight. This can be manufactured by many different routes including acid washing, chlorine addition, boron addition, and utilisation of soda adsorbing compounds.
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