Cenospheres is able to float on the surface of fly ash hollow ball, pale, thin wall hollow, very light weight, bulk density 720kg/m3(heavy), 418kg/ma (light), particle size of about 0.1mm, closed and smooth surface, thermal conductivity is small. Refractoriness 1610 is the excellent insulation refractory cast able used in the production of light and oil drilling. The chemical composition of cenospheres of silicon dioxide and aluminum oxide-based, with fine particles, hollow, light weight, high strength ,wear resistance, high temperature, thermal insulation, fire-retardant insulation and other functions has been widely used one of refractory materials.