Abstract: Calcium aluminate clinker containing different contents of F in CaOAl2O3SiO2 system was obtained with analytically pure reagents as raw materials. The selfdisintegrating property， sintering and leaching properties of the clinker were studied by XRF， XRD and SEMEDS methods. The results indicate that β2CaO·SiO2 converts into γ2CaO·SiO2 normally when clinker contains F， which has little effect on the selfdisintegrating property of clinker. But F has significant effects on the phase composition of calcium aluminates. F promotes the formation of 2CaO·Al2O3·SiO2 and 11CaO·7Al2O3·CaF2 while reduces the formation of 12CaO·7Al2O3 and CaO·Al2O3. The Al2O3 leaching rate reduces with 2CaO·Al2O3·SiO2 entering into clinker. The Al2O3 leaching rate of clinker decreases from 9501% to about 70% when the F addition increases from 0 to 20%. The content of F should be less than 05% in the clinker.

Key words: CaOAl2O3SiO2 system, F, phase composition, Al2O3 leaching, calcium aluminate