I. Differences in Production Processes
The biggest difference between calcined alumina and activated alumina lies primarily in their calcination temperatures.
Calcinated alumina is produced by calcining aluminum hydroxide at temperatures ranging from 1000℃ to 1700℃, resulting in a stable α-Al₂O₃ crystal structure. This structure is highly stable, has high hardness, and excellent wear resistance.
Activated alumina, on the other hand, is calcined at lower temperatures, from 400℃ to 600℃, forming a γ-Al₂O₃ crystal phase structure while retaining a large number of micropores. Therefore, it possesses a very high specific surface area and adsorption capacity.
In short:
· High-temperature calcination → Calcined alumina → Dense structural material
· Low-temperature calcination → Activated alumina → Porous adsorption material
II. Differences in Structure and Performance
Due to their different crystal phases, the two types of alumina have significantly different physical properties.
Characteristics of Calcined Alumina:
·α-crystal phase structure
·High hardness
·Good wear resistance
·High melting point
·Good chemical stability
·Almost no adsorption capacity
·Primarily used as a structural material or filler
Characteristics of Activated Alumina:
·γ-crystal phase structure
·Porous structure
·Large specific surface area
·Strong adsorption capacity
·Can adsorb moisture, fluorine, arsenic, chlorine, sulfides, etc.
·Renewable and reusable
·Primarily used as an adsorbent and desiccant
In summary: Calcined alumina is mainly used in the materials industry, while activated alumina is mainly used in the adsorption and drying industries.
III. Differences in Application Areas
Main Applications of Calcined Alumina:
Ceramics Industry
Refractory Materials
Polishing and Grinding Materials
Electronic Ceramics
Insulating Materials
Fillers
Coatings
Thermal Conductive Materials
Main Applications of Activated Alumina:
Air Drying
Gas Drying
Water Treatment Defluorination
Arsenic Removal
Dechlorinating Agent
PSA Oxygen Production
Catalyst Support
Air Separation Equipment Desiccant
Petrochemical Gas Purification
Therefore, when selecting a product, you must first determine whether your application is for structural materials or adsorption purification.
Zibo Xiangrun Environmental Engineering Co., Ltd. possesses stable production processes and extensive industry application experience in calcined alumina products. Using high-quality aluminum hydroxide as raw material, the company strictly controls the calcination temperature and time to ensure its products exhibit high α-Al₂O₃ content, stable crystal phase, and excellent high-temperature resistance. These characteristics make the products suitable for various industries, including ceramics, refractory materials, polishing and grinding, electronic ceramics, and fillers. Our calcined alumina products boast advantages such as high purity, high hardness, good wear resistance, and strong batch stability. We can provide various particle size specifications and customized solutions to meet different customer application needs, helping customers improve product performance, reduce production costs, and maintain stable production.
If you have any questions or needs regarding calcined alumina, please contact Zibo Xiangrun Environmental Engineering Co., Ltd. – a professional alumina manufacturer.
