RATE OF FORMATION OF C3S IN THE SYSTEM CAO-SIO2-AL2O3-FE2O3-MGO WITH ADDITION OF CAF2

The influence of CaF2 on the kinetics of the reaction C+C2S → C3S in five-component diffusion sandwiches (CaOSiO2Al2O3Fe2O3MgO) was determined in the temperature interval 1350°C to 1500°C. With the addition of 0.5% CaF2 to the reacting system the rate of reaction increased by a factor of 2.4 at a reaction temperature of 1350°C, and a factor of 1.2 at 1500°C. Addition of 1% CaF2 raised the reaction rate 2.8 times at 1350°C and 1.7 times at 1500°C. The effect of CaF2 on the rate of C3S formation may be attributed to the fact that the C3S primary field is much wider in the CSCaF2 system than in the CSAF system. © 1979.