Inorganic silica gel is a highly active adsorption material, which is usually prepared by reaction of sodium silicate with sulfuric acid and a series of post-treatment processes such as aging and acid bubbles. Silica gel belongs to amorphous substance and its chemical formula is mSiO 2.nH 2. It is insoluble in water and famenb.89ix.comqiexiaoyou.89ix.comjiareguant.89ix.comkongzhiqiz.89ix.comguolvmian.89ix.comfeibiaom
en.89ix.comany solvents, non-toxic and tasteless, stable in chemical properties, and does not react with any substance except strong alkali and hydrofluoric acid. Different types of silica gels have different microporous structures because of their different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many characteristics that other similar materials are difficult to replace: high adsorption performance, good thermal stability, chemical stability, high mechanical strength, household use as desiccant, humidity regulator, deodorant, industrial use as oil hydrocarbon decolorizer, catalyst carrier, pressure swing adsorbent, etc. Beer stabilizer, paint thickener, toothpaste friction agent, extinction agent, etc.硅胶根据其孔径的大小分为：大孔硅胶、粗孔硅胶、B型硅胶、细孔硅胶。由于孔隙结构的不同，因此它们的吸附性能 各有特点。粗孔硅胶在相对湿度高的情况下有较高的吸附量，细孔硅胶则在相对湿度较低的情况下吸咐量高于粗孔硅胶，而B型硅胶由于孔结构介于粗、细孔之间，其吸附量也介于粗、细孔之间。
Silica gel can be divided into macroporous silica gel, coarse porous silica gel, B type silica gel and fine porous silica gel according to its pore size. Because of the different pore structure, their adsorption properties have their own characteristics. Coarse-porous silica gel has higher adsorption capacity in the case of high relative humidity, while fine-porous silica gel has higher adsorption capacity in the case of low relative humidity than coarse-porous silica gel, while B-type silica gel has the adsorption capacity between coarse and fine pore due to its pore structure.
According to its use, inorganic silica gel can also be divided into beer silica gel, pressure swing adsorption silica gel, medical silica gel, discolored silica gel, silica gel desiccant, silica gel opener, toothpaste silica gel and so on.