Diatomite is a kind of siliceous rock and a biogenic siliceous sedimentary rock. It is mainly composed of the remains of ancient diatoms. Its chemical composition is mainly SiO2, which can be expressed by SiO2 · nH2O, and its mineral composition is Opal and its variants. China's Diatomite reserves are 320 million tons and the prospective reserves are more than 2 billion tons. It is mainly concentrated in East China and Northeast China, of which Jilin, Zhejiang, Yunnan, Shandong, Sichuan and other provinces have large scale and large reserves.

Agricultural and pharmaceutical industry: wettable powder, dryland herbicide, paddy field herbicide and various biological pesticides. Advantages of diatomite: neutral pH value, non-toxic, good suspension performance, strong adsorption performance, light bulk weight, oil absorption rate of 115%, fineness of 325 mesh - 500 mesh, good mixing uniformity, no blockage of agricultural machinery pipeline, moisturizing in the soil, loosening the soil, prolonging the efficacy and fertilizer effect time, and promoting the growth of crops.