Silica refers to a class of all natural minerals containing SiO2, which is a kind of mineral with the largest amount of reserves in nature. In the rock-forming minerals composed of crust, the content of silica is more than 50%. They exist in the form of microsilica-containing minerals, or combined with other oxides to form various silicate minerals. The purest silica-containing minerals in the natural world are crystals because of their low yields and the fact that they are very industrial. An important use, so the ceramic industry is widely used.