Study on the Production of Ceramic Glass from Calcium-Silica Residue

Calcium-silica residue is the leaching residue of the lime sinter process which is used to extract alumina from low-grade bauxite or fly ash. The major phases of this residue are dicalcium silicate and calcium carbonate, and the minor phases are aluminates. A large amount of calcium-silica residue is produced because of the high material flow of lime sinter process and most of it is stockpiled. The main contents of the residue, CaO and SiO2, are the same as the main contents of ceramic glass. Therefore, the production of ceramic glass using calcium-silica residue as the main raw materials, B2O3 as fluxing agent and P2O5 as nucleation agent is reported on in this paper. XRD and DSC are used to analyze the property of the ceramic glass. The results show that the flexural strength and corrosion resistance of the ceramic glass obtained through a melting method are better.