Diatomite is a kind of siliceous rock, mainly distributed in China, the United States, Japan, Denmark, France, Romania and other countries. It is a biogenic siliceous sedimentary rock, which is mainly composed of the remains of ancient diatoms. [China's Diatomite reserves are 320 million tons, with prospective reserves of more than 2 billion tons, mainly concentrated in East China and Northeast China, of which Jilin, Zhejiang, Yunnan, Shandong, Sichuan, etc. are large-scale and have more reserves.

Diatomite can be used as functional filler, mainly used in coatings, plastics, rubber, medicine, papermaking, abrasives, precision castings and microporous ceramics. Diatomite as filler of paint coating can improve the stability, elasticity and dispersion of products, and improve the strength, wear resistance and acid resistance of products. As a functional filler, diatomite can also play a role in extinction. If diatomite is added to the silicone rubber, the oil resistance and heat resistance of the rubber can be enhanced, and the processability can be improved.

Using diatomite as filler to produce paperboard can save 20% pulp, not only reduce the production cost, but also improve the cleanliness and strength of paperboard. The high-quality diatomite is added to the automobile brake lining and asbestos friction plate for mechanical industry. It is easy to combine with resin and other materials. It has a special combination with rubber oil. It has both filling and reinforcing effects, and can overcome the thermal degradation performance of the product and enhance the adaptability of the product. Diatomite itself has a large number of micropores, so it is a good filler for the preparation of microporous ceramic membrane tubes. Some people have successfully developed diatomite microporous ceramic membrane tubes with high-quality selected diatomite as filler.