The main component of diatomite as the carrier is SiO2. For example, the active component of industrial vanadium catalyst is V2O5, the cocatalyst is alkali metal sulfate, and the carrier is refined diatomite. The results show that SiO2 has a stabilizing effect on the active components, and it increases with the increase of K2O or Na2O content. The activity of the catalyst is also related to the dispersion of the support and pore structure. After treating diatomite with acid, the oxide impurity content decreases, SiO2 content increases, specific surface area and pore volume also increase, so the carrier effect of refined diatomite is better than that of natural diatomite.
Diatomite is generally formed from the remains of silicates after the death of single-celled algae, collectively called diatoms, and is essentially hydrated amorphous SiO2. Diatoms can live in both fresh and salt water. There are many kinds of diatoms, which can be generally divided into the “middle mind” diatoms and the “feather striata” diatoms. In 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 SiO2 content often exceeds 70%. Single diatoms are colorless and transparent, and the color of diatomite depends on clay minerals and organic matter, etc., and the composition of diatoms from different mineral sources is different.
Diatomite is a fossil diatomite deposit formed after an accumulation period of about 10,000 to 20,000 years after the death of single-celled plants called diatoms. Diatoms are among the first protozoa to appear on Earth, living in seawater and lakes. It is this diatom, which provides oxygen to the earth through photosynthesis, that is responsible for the birth of humans and animals and plants.
This kind of diatomite is formed by the deposition of the remains of single-celled aquatic plant diatomite. The unique property of diatomite is that it can absorb the free silicon in the water to form its skeleton. When its life is over, it can deposit and form a diatomite deposit 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.
Post time: May-05-2022