Active aluminum oxide desiccant is a porous material with adsorption properties and catalytic activity, characterized by high dispersion and large specific surface area. It is suitable for drying various gases and liquids and is used as an adsorbent, desiccant, catalyst, and carrier in many reaction processes in petroleum, fertilizers, and chemical industries. This product is made from high-purity aluminum oxide through scientific formulation and catalytic refinement. It has high compressive strength, a long service life, and can be reused multiple times through regeneration methods. The principle of defluorination is that fluorine is adsorbed on the surface of the adsorbent to form insoluble fluorides. At the same time, SO42– on the adsorbent can exchange with F- and HCO3ˉ and other anions in water. The adsorbent can be placed in a filter bed, generally with a thickness of 700~1000mm and a particle size of 0.5~2.5mm, with a filtration speed of 1.5~2.5m/n. The support layer uses gravel with a thickness of 400~700mm, and the raw water pH is adjusted to 5.5~6.5 using acid. Using small particle active aluminum oxide with a large specific surface area can improve defluorination effectiveness and reduce water production costs. When the defluorination capacity of the active aluminum oxide adsorbent does not meet standards, aluminum can be prepared into a 1%~2% solution, passed through a filter column at a flow rate of 0.6m/n for 6~8 minutes for regeneration, and then reused. This method has a strong defluorination capacity and is an excellent technology for removing fluoride and other inorganic ions. Typically, active aluminum oxide is produced by calcining aluminum hydroxide at 400℃~600℃ or by burning general aluminum oxide with alkaline metal ions at 400℃~500℃ to form white granular porous adsorbents. //// Adsorption Function of Active Aluminum Oxide Desiccant Active aluminum oxide desiccant is a multi-micro porous spherical substance with strong adsorption capabilities, large specific surface area, high compressive strength, and long service life, capable of being reused through regeneration. This product is a white, spherical, porous, non-toxic, odorless substance that does not powder or dissolve in water. It is widely used in the petroleum and chemical industries, textiles, metallurgy, and other industries for instrument air drying, in pressure swing adsorption air separation devices, with a dew point adsorption capacity reaching above -41 degrees. It can also be used for deep drying of liquid and gas phases in steel, petroleum cracking gas, ethylene, and propylene. Active aluminum oxide, also known as reactive alumina, is referred to in English as Activated Alumina or Reactive Alumina; activated aluminum oxide. The aluminum oxide used in catalysts is commonly referred to as "active aluminum oxide," which is a porous, highly dispersed solid material with a large surface area. Its microporous surface possesses the characteristics required for catalytic action, such as adsorption properties, surface activity, and excellent thermal stability, making it widely used as a catalyst and catalyst carrier in chemical reactions. The spherical active aluminum oxide pressure swing oil adsorbent consists of white spherical porous particles with uniform particle size, smooth surface, high mechanical strength, and strong moisture absorption. After absorbing water, it does not swell or crack, maintaining its original state. It is non-toxic, odorless, and insoluble in water. Active aluminum oxide is an efficient desiccant for deep drying of trace water. It is especially suitable for non-thermal regeneration devices. //// Main Factors Affecting the Adsorption Performance of Active Aluminum Oxide: (1) Particle Size: The smaller the particle size, the higher the adsorption capacity, but smaller particle sizes also result in lower particle strength, affecting their service life. (2) Raw Water pH Value: When the pH value is greater than 5, the lower the pH value, the higher the adsorption capacity of active aluminum oxide. (3) Initial Fluoride Concentration of Raw Water: The higher the initial fluoride concentration, the greater the adsorption capacity. (4) Alkalinity of Raw Water: A high concentration of bicarbonate in raw water will reduce the adsorption capacity. (5) Chloride Ions and Anions. (6) Influence of Arsenic: Active aluminum oxide has an adsorption effect on arsenic in water. The accumulation of arsenic on active aluminum oxide reduces the adsorption capacity for fluoride ions and makes the elution of arsenic ions during regeneration more difficult.