diatomite

Diatomite is a kind of light porous siliceous biosedimentary rock formed from diatom silicate remains.

chemical composition

The chemical composition of diatomite is mainly amorphous SiO2, which exists in the form of SiO2 · nH2O. SiO2 usually accounts for more than 80%, up to 94%. It contains a small amount of Al2O3, Fe2O3, Cao, MgO, K2O, Na2O, P2O5 and organic matter, and some metal impurities such as Cr and ba. The composition and content of diatomite ores in different regions are different.

physical property

The color of diatomite is white, gray, light gray, light grayish brown, light yellow, etc; Density 1.9~2.3g/cm3; Bulk density 0.34~0.65g/cm3; Melting point 1650 ℃ ~1750 ℃; Specific surface area 19~65cm2/g; Pore volume: 0.45~0.98cm3/g; The water absorption is 2~4 times of its own volume. High chemical stability, insoluble in hydrochloric acid and easily soluble in alkali. It has many excellent properties, such as relative incompressibility, softness, sound insulation, wear resistance, heat resistance and so on.

Development and Application

Because of its unique physical and chemical properties, diatomite has been widely used as filter aid, functional filler, catalyst carrier, pesticide and fertilizer carrier, thermal insulation material, adsorbent and bleaching material.