Silica gel has what basic commonly used knowledge! Inorganic silica gel is a kind of high activity adsorption material, which is transparent or milky white granular solid. With open porous structure, strong adsorption, can absorb a variety of substances. If absorbing water, hygroscopicity is about 40%. Blue silica gel - if cobalt chloride is added, it is blue when dry, and red after absorbing water. Blue silica gel contains a small amount of cobalt chloride, toxic, should avoid contact with food and inhalation in the mouth, such as poisoning incidents should immediately seek medical treatment.

Silica gel in the use of the process due to adsorption of water vapor or other organic substances in the medium, adsorption capacity decreased, can be reused through regeneration. After silica gel absorbs water, water can be removed by thermal desorption. There are many heating methods, such as electric furnace, flue waste heat heating and hot air drying. The temperature of desorption heating should be controlled at 120-180 ℃, while the temperature of blue glue indicator, color-changing silica gel and DL-type blue silica gel should be controlled at 100-120 ℃.