Active aluminum oxide desiccant is a porous material with adsorption properties and catalytic activity, characterized by high dispersion and a large specific surface area. It is suitable for drying various gases and liquids, serving as an adsorbent, desiccant, catalyst, and support in many reaction processes in petroleum, fertilizers, and chemical industries. This product is scientifically formulated and catalytically refined from high-purity aluminum oxide. It has high compressive strength, a long service life, and can be regenerated for repeated use. The principle of defluorination is that fluoride ions are adsorbed on the surface of the adsorbent to form insoluble fluorides, while SO42– on the adsorbent can exchange with other anions such as F- and HCO3ˉ in water. The adsorbent can be placed in a filter bed, typically with a thickness of 700 to 1000 mm and a particle size of 0.5 to 2.5 mm, with a filtration speed of 1.5 to 2.5 m/n. The support layer is made of pebbles, with a thickness of 400 to 700 mm, and the pH of the raw water is adjusted to 5.5 to 6.5 using acid. By using small particle activated aluminum oxide, which has a large specific surface area, the defluorination effect can be improved, thereby reducing the cost of water production. When the defluorination capacity of the activated aluminum oxide adsorbent does not meet the standards, an aluminum solution can be prepared at a concentration of 1% to 2%, passed through a filter column at a flow rate of 0.6 m/n for 6 to 8 minutes to regenerate it, and then reused. This method has a strong defluorination capacity and is an excellent technology for removing fluorides and various inorganic ions. Typically, activated aluminum oxide is produced by calcining aluminum hydroxide at 400°C to 600°C or by burning general aluminum oxide with alkaline metal ions to form white granular porous adsorbents at 400°C to 500°C. //// Adsorption Function of Activated Aluminum Oxide Desiccant Activated aluminum oxide desiccant is a multi-microporous spherical material with strong adsorption capabilities, a large specific surface area, high compressive strength, a long service life, and the ability to be reused through regeneration. This product is a white, spherical porous material that is non-toxic, odorless, does not pulverize, and is insoluble in water. It is widely used in the petroleum and chemical industries, textile, metallurgy, and other sectors for instrument air drying and pressure swing adsorption air separation devices, achieving dew points of -41 degrees Celsius and above. It can also be used for deep drying of liquid and gas phases in steel, petroleum cracking gas, ethylene, and propylene. Activated aluminum oxide, also known as reactive alumina, has the English name Activated Alumina or Reactive alumina; activated alumin(i)um oxide. When used in catalysts, aluminum oxide is specifically referred to as "activated aluminum oxide." It is a porous, highly dispersed solid material with a large surface area, and its microporous surface possesses the characteristics required for catalytic activity, such as adsorption capacity, surface activity, and excellent thermal stability, making it widely used as a catalyst and catalyst support in chemical reactions. Spherical activated aluminum oxide pressure swing oil adsorbent is a white spherical porous particle with uniform particle size, smooth surface, high mechanical strength, and strong moisture absorption. After absorbing water, it does not expand or crack and maintains its original state; it is non-toxic, odorless, and insoluble in water. Activated aluminum oxide is an efficient desiccant for deep drying of trace water, making it very suitable for non-thermal regeneration devices. //// Main Factors Affecting the Adsorption Performance of Activated Aluminum Oxide: (1) Particle Size: The smaller the particle size, the higher the adsorption capacity, but smaller particle sizes lead to lower particle strength, which affects their service life. (2) Raw Water pH Value: When the pH value exceeds 5, the lower the pH, the higher the adsorption capacity of activated 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 ions in raw water will reduce the adsorption capacity. (5) Chloride Ions and Anionic Radicals. (6) The Influence of Arsenic: Activated aluminum oxide has an adsorption effect on arsenic in water; the accumulation of arsenic on activated aluminum oxide reduces the adsorption capacity for fluoride ions and makes it difficult to elute arsenic ions during regeneration.