Activated Alumina I. Basic information of activated alumina, also known as activated alumina. In the alumina catalyst is usually specifically referred to as "activated alumina", which is a porous, high dispersion of solid materials, a large surface area, the microporous surface catalysis of the required features, such as adsorption, surface activity, good thermal stability, so widely used as chemical catalysts and catalyst supports. Spherical activated alumina sorbent transformer oil is white spherical porous particles, activated alumina uniform size, smooth surface, high mechanical strength, moisture absorption, no swelling maintain the status quo does not crack after absorbing water, non-toxic, odorless, insoluble water, ethanol. Activated alumina is an efficient desiccant drying water depth trace. Very suitable for non-thermal regeneration device. Activated Alumina Appearance: white spherical porous activated alumina particles, uniform size, smooth surface, high mechanical strength, moisture absorption, no swelling maintain the status quo does not crack after absorbing water, non-toxic, odorless, insoluble in water, ethanol, Fluoride has a strong adsorption, mainly for high fluoride areas of fluoride in drinking water. Second, the People's Republic of China Ministry of Chemical Industry Standard Standard: HG / T 3927-2007 parameter / name hydrogen peroxide special traits alumina activated alumina desiccant activated alumina fluoride removal agent traits crystalline γ-Al2O3 x-ρ Al2O3 Size (mm) 7-14 mesh Φ3-5, Φ4-6, Φ5-7 Φ3-5, Φ4-6, Φ5-7, Φ8-10 Φ1.5-2, Φ4-3, Φ4-6, Φ5-7 white spherical appearance White spherical white spherical Bulk density (g/cm3) 0.68-0.75 0.68-0.89 ≥ 0.75 Strength (N / tablets)> 50> 13050-80 surface area (m2 / g) 200-260 280-360 280-360 pore volume (cm3 / g) 0.40-0.46 0.38-0.40 0.40 macropores (> 750A) 0.14 absorption (%)> 50 static adsorption capacity (RH%) 18 fluoride (mgF / g Al2O3) ≥ 1.2 Third, the use of activated alumina activity aluminum fluoride can be used as drinking water fluoride removal agent (fluoride removal capacity), benzene production of cyclic alkanes defluorination agent, transformer oil regeneration deacidification agent, used as oxygen industry, textile industry, the electronics industry gas drying, air drying and automated instrumentation in the fertilizer industry as a desiccant, cleaning agents (dew point up to -40 degrees), the dew point of the air separation industry, PSA may, petrochemical drying up to -55 degrees. Is a water-efficient desiccant drying trace depth. Very suitable for non-thermal regeneration device. Fourth, the main factors affecting the adsorption properties of activated alumina: ⑴ particle size: the smaller the particle size, the higher the adsorption capacity, but the smaller the particle size, the lower the particle strength, affecting their life. ⑵ raw water PH value: When the value is greater than 5 PH, PH value is lower, the higher the adsorption capacity of activated alumina. ⑶ initial raw water fluoride concentration: the higher the initial fluoride concentration, greater adsorption capacity. ⑶ raw water alkalinity: raw water high bicarbonate concentration, adsorption capacity will be reduced. ⑷ chloride ions and sulfate ions. Effect ⑸ arsenic: arsenic activated alumina has a water adsorption of arsenic accumulated on the activated alumina causes the decrease in the adsorption capacity of fluoride ions, and that the reproduction is difficult eluted arsenic ions.