In general, silica gel can be divided into organic silica gel and inorganic silica gel according to its nature and components.
Inorganic silica gel is a highly active adsorbent material and is usually prepared by the reaction of sodium silicate and sulfuric acid and a series of post-treatment processes such as aging and soaking. Silica is an amorphous material, its chemical formula is mSiO2. nH2O. It is insoluble in water and any solvent, non-toxic and odorless, chemically stable, and does not react with any substances except strong alkali and hydrofluoric acid. Various types of silica gel form different microporous structures due to their different manufacturing methods.
The chemical composition and physical structure of silica gel determine that it has many other similar materials that are difficult to replace: high adsorption performance, good thermal stability, chemical stability, and high mechanical strength. Because of its chemical nature, we also use it for many types of silicone products, such as silicone seals (what is silicone seals), silicone seals, and manufactured products.
According to the size of its pore size, silica gel is divided into: large pore silica gel, coarse pore silica gel, B-type silica gel, and fine-pored silica gel. Due to the different pore structures, their adsorption properties are unique. Rough-hole silica gel has a higher adsorption capacity in the case of high relative humidity, while fine-pored silica gel has higher adsorption capacity than coarse-pored silica in the case of relatively low relative humidity, and B-type silica gel is coarse and fine due to the pore structure. Between the pores, the amount of adsorption is also between coarse and fine pores.
Macroporous silica gel is generally used as a catalyst carrier, matting agent, toothpaste abrasive, and the like. Therefore, different varieties should be selected according to different uses.
The main component of silica gel is silica, chemically stable and does not burn. Silica gel is an amorphous silica. The dust content in the workshop should be controlled to be no more than 10 mg/m3. Exhaust air should be strengthened and masks should be worn during operation.
Silica gel has a strong adsorption capacity and can have a dry effect on human skin. Therefore, work clothes should be worn during operation. If silicone gets into your eyes, rinse with plenty of water and seek medical attention as soon as possible.
Blue silica gel contains a small amount of cobalt chloride and is toxic. It should be avoided in contact with food and inhalation. If a poisoning occurs, it should be immediately treated by a doctor.
In the course of use, the adsorption capacity of the silica gel is reduced due to the adsorption of water vapor or other organic substances in the medium, and it can be reused after regeneration.