Diatomaceous earth

Diatomite is composed of amorphous SiO2 and contains a small amount of Fe2O3, CaO, MgO, Al2O3 and organic impurities. Diatomite is usually light yellow or light gray, soft, porous and light. It is commonly used in industry as insulation material, filter material, filler, grinding material, sodium silicate raw material, decolorizing agent and diatomite filter aid, catalyst carrier, etc.The special porous structure of natural diatomite can be observed under microscope, and this microporous structure is the reason of the characteristic physical and chemical properties of diatomite.The main component of diatomite as a carrier is SiO2. For example, the active component of industrial vanadium catalyst is V2O5, the co-catalyst is alkali metal sulfate, and the carrier is refined diatomite. The results showed that SiO2 had a stabilizing effect on the active component, and it was strengthened with the increase of K2O or Na2O content. The activity of the catalyst is also related to the dispersion and pore structure of the support. After diatomite is treated with acid, the content of oxide impurity decreases, the content of SiO2 increases, the specific surface area and pore volume also increase, so the carrier effect of refined diatomite is better than that of natural diatomite.Diatomite is usually formed from the dead silicate remains of single-celled algae known collectively as diatoms, which are essentially amorphous SiO2 containing water. Diatoms can live in both fresh and salt water, and there are many species. They can be generally divided into the "Diatoms of the Order" and the "Diatoms of the Order". Within each order, there are many "genera", which are quite complex.The main component of natural diatomite is SiO2. The high-quality diatomite is white, and the content of SiO2 often exceeds 70%. Monomer diatoms are colorless and transparent. The color of diatomite depends on clay minerals and organic matter, etc. The composition of diatomite from different mineral sources is different.Diatomite is a kind of fossil diatomite deposit formed after the death of single-celled plants called diatoms during the accumulation period of about 10 to 20 thousand years. Diatoms are among the first protists to appear on Earth. They live in sea or lake water.This kind of diatomite is formed by the remains of single-celled aquatic plant diatoms. The unique property of this kind of diatomite is that it can absorb free silicon in water to form its skeleton. When the skeleton is deposited after the end of its life, the diatomite deposit can be formed under certain geological conditions. It has some unique properties, such as porosity, low concentration, the larger specific surface area, relative incompressibility and chemical stability, through to the original soil crushing, sorting, calcination, such as air flow classification, to complex processing process to change its particle size distribution and surface properties, is suitable for coating of paint additives, and other industrial requirements.