The crystal chemical formula of kaolinite is 2SiO2 · Al2O3 · 2H2O, and its theoretical chemical composition is 46.54% SiO2, 39.5% Al2O3, and 13.96% H2O. Kaolin minerals belong to 1:1 type layered silicates, with crystals mainly composed of silicon oxygen tetrahedra and aluminum hydroxide octahedra. The silicon oxygen tetrahedra are connected along a two-dimensional direction in a common vertex angle to form hexagonal grid layers, and the pointed oxygen that is not shared by each silicon oxygen tetrahedra faces one side; The 1:1 type unit layer is composed of the pointed oxygen of the common silicon oxygen tetrahedral layer shared by the silicon oxygen tetrahedral layer and the oxygen attracting octahedral layer