Silicon dioxide sol was synthesized by silicon in the presence of alkali catalyst. SiO2 nanoparticles (size in 8-15 nm) aqueous dispersion was prepared by using
When raw materials were preheated to 1000-1300 ℃ by electricity and microwave was inputted for 1 min 5 s-4 mins, then alunminate clinkers were obtained. The f-