Effect of ferrite phase on the formation and coexistence of 3CaO·3Al2O3·CaSO4 and 3CaO·SiO2 minerals

Abstract

The effect of ferrite on the formation and coexistence of 3CaO·3Al2O3·CaSO4 (C4A3$) and 3CaO·SiO2 (C3S) was investigated in this paper. The results indicate that 20 % content of ferrite phase with the composition of C2A0.5F0.5 can facilitate the coexistence of C4A3$ and C3S solid solutions at 1350°C. There are other trace elements that incorporate into clinker minerals and form solid solutions. In addition, the dark and polygonal C4A3$ solid solution is not dissolved in liquid phase at 1350°C. It can promote the burnability of the raw mixes and provide a favorable condition for the formation of C3S. However, it has an adverse effect on the coexistence of two clinker minerals with the changing of ferrite compositions. This will provide the important basis for the preparation of the calcium sulphoaluminate cement clinker containing C3S.