Process flow for preparing nano-scale silica from diatomite

Diatomaceous earth is composed of amorphous SiO2 and contains a small amount of impurities such as Fe2O3, Al2O3 and organic matter. Usually light yellow or light gray, soft and porous. Industrially, nano-silica can be prepared from diatomaceous earth according to the following process.

Calcination is firing at high temperature, the function is to burn off the crystal water and organic matter of diatomite, and has the effect of purification. Calcined diatomite can remove organic impurities in diatomite.