Appearance of activated alumina: activated alumina is white spherical porous particles with uniform particle size, smooth surface, high mechanical strength, strong hygroscopicity, does not swell or crack after absorbing water, and remains intact, non-toxic, odorless, insoluble in water and ethanol, It has strong adsorption to fluorine and is mainly used to remove fluoride in drinking water in high-fluorine areas.
Activated alumina has selective adsorption capacity for gas, water vapor and some liquid moisture. After the adsorption is saturated, it can be revived by heating at about 175-315°C to remove water. Adsorption and resurrection can be performed multiple times. In addition to being used as a desiccant, it can also absorb the vapor of lubricating oil from polluted oxygen, hydrogen, carbon dioxide, natural gas, etc. It can also be used as catalyst and catalyst carrier and chromatography carrier.
Activated alumina under certain operating conditions and regeneration conditions, the product's drying depth is as high as the dew point temperature-70 degrees or less. 
Alumina is divided into calcined alumina and ordinary industrial alumina. Calcined alumina is an essential raw material for the production of antique bricks, while industrial alumina can be used to produce microcrystalline stones. In traditional glazes, alumina is often used for whitening. As antique tiles and microcrystalline stones are favored by the market, the amount of alumina is also increasing year by year.
Therefore, alumina ceramics emerged in the ceramic industry-alumina ceramics is a ceramic material with Al₂O₃ as the main raw material and corundum as the main crystal phase. Because of its high mechanical strength, high hardness, and high-frequency dielectric It has the advantages of low loss, high insulation resistance at high temperature, good chemical resistance and thermal conductivity, and other excellent comprehensive technical performance.