Activated alumina

What is Activated Alumina?

Activated alumina desiccant is a highly porous, granular substance made from aluminum oxide. The activation process involves heating aluminum hydroxide in a way that creates a network of interconnected pores, resulting in a large surface area and high adsorption capacity. Activated alumina desiccant is widely used in industries such as gas and air drying, natural gas dehydration, compressed air systems, and the drying of liquids. Additionally, activated alumina desiccant is non-toxic, chemically stable, and safe for use in food and pharmaceutical industries.

Activated Alumina

What is the method for producing raw materials for Activated Alumina?

The production of activated alumina desiccant involves a series of steps to create the highly porous and adsorptive material. Aluminum oxide (alumina) is the primary precursor used in this process. Initially, aluminum hydroxide is extracted from bauxite ore or other sources, and then subjected to a calcination process at elevated temperatures. This calcination removes water molecules and transforms aluminum hydroxide into aluminum oxide, which serves as the basis for activated alumina. Subsequently, the aluminum oxide is further processed through a controlled activation process, typically involving high-temperature treatments in the presence of steam or other gases. This process generates a network of pores and increases the surface area of the material, enhancing its moisture adsorption capabilities. The resulting activated alumina is then cooled, crushed, and sieved to achieve the desired particle size for various applications. The specific parameters of the calcination and activation steps influence the pore structure and surface area, ultimately determining the efficiency of the activated alumina desiccant in moisture adsorption and other adsorptive applications.
Activated Alumina

What are the characteristics of Activated Alumina?

  • High Adsorption Capacity: Due to its porous nature, activated alumina exhibits a high adsorption capacity for moisture, gases, and various impurities.

  • Selective Adsorption: Activated alumina can selectively adsorb certain molecules and substances while excluding others. This property allows it to target specific impurities or components in a mixture.

  • Regenerability: Activated alumina can be regenerated by heating to release the adsorbed moisture or impurities.

  • Chemical Compatibility: Activated alumina is chemically inert and can withstand exposure to a wide range of chemicals and gases without significant degradation.

  • Temperature Resistance: It can withstand high temperatures, making it suitable for applications involving heat or elevated temperatures.

  • Low Dust Generation: It generally produces low amounts of dust, which is beneficial for applications where dust contamination needs to be minimized.

  • Customizable Properties: The properties of activated alumina, such as pore size and surface area, can be tailored through manufacturing processes to suit specific applications.

What can Activated Alumina desiccant be used for?

Due to the strong affinity between activated alumina and water, it exhibits a high capability for drying moisture in gases. It can effectively dry over twenty types of gases, including acetylene, hydrogen, oxygen, air, nitrogen, and others.

Water Purification - Activated Alumina Desiccant
Gas Drying - Activated Alumina

Activated alumina is commonly used in liquid drying processes, particularly for removing moisture from various liquids. This procedure involves setting up a column or bed, followed by adsorption, regeneration, monitoring, and ultimately, reuse.

In the field of water purification, activated alumina mainly focusing on fluoride removal, color and odor elimination, and phosphate removal from water.

Liquid Drying - Activated Alumina Desiccant
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