High-performance activated alumina can bring many benefits to the formulation of amorphous refractory materials, including increasing bulk density, flowability, strength, and secondary mullite formation, as well as reducing water addition and porosity. Additionally, activated alumina can also be used as a desiccant, with a high water absorption capacity, fast drying speed, and regenerability. Activated alumina balls themselves also have many characteristics:
In the petrochemical and fertilizer industries, they are widely used as catalysts and catalyst carriers. Activated alumina also has adsorption properties, making it suitable for use as a drying agent for gases and liquids, an adsorbent for gas purification, a fluoride removal agent for drinking water, and a color and odor eliminator for industrial wastewater.
Here are the physical properties of activated alumina balls:
1、Angle of Repose: The angle at which the material naturally piles up on a smooth surface. A larger angle of repose makes activated alumina more easily dissolved in electrolytes, while also reducing fly loss.
2、α-Al2O3 Content: Reflects the degree of calcination of activated alumina. The higher the degree of calcination, the more α-Al2O3 content there is. However, the hygroscopicity of activated alumina decreases with an increase in α-Al2O3 content. Therefore, aluminum oxide used for electrolysis requires a certain amount of α-Al2O3, but its solubility in the electrolyte is worse than that of γ-Al2O3.
3、Bulk Density: Refers to the weight of the material per unit volume in its natural state. Usually, activated alumina with lower bulk density is more conducive to dissolution in the electrolyte.
4、Particle Size: Refers to the degree of fineness or coarseness of activated alumina. The particle size of activated alumina must be appropriate, as excessively coarse particles dissolve slowly in the electrolyte and even precipitate, while excessively fine particles can easily result in fly loss.
5、Specific Surface Area: Refers to the total surface area of activated alumina's external and internal pore surfaces per unit weight. It is an important indicator of substance activity. Activated alumina with a larger specific surface area has better solubility and greater activity in the electrolyte, but it is also more hygroscopic.
6、Wear Coefficient: The percentage change in particle size distribution after activated alumina is subjected to controlled conditions in a fluidized bed. The wear coefficient reflects the physical strength of activated alumina.
