Dissolution of the Clinker Minerals in the Clinker Melt

Abstract

Viscosity of the melt assumed to exist at the time of portland cement clinker formation was measured in the temperature range 1350°-1550°C, and the mechanism and kinetics of dissolution of CaO and 2CaO⋅SiO2 into the melt were investigated.1. The viscosity of the melt increases with the addition of 3CaO⋅SiO2 and 2CaO⋅SiO2 but decreases with the addition of CaO. The relationship between the viscosity and reciprocal absolute temperature can not be regarded as linear, over a wide temperature range. This fact may be resulted from the structural change of melt.2. Dissolution process is considered to be controlled mainly by diffusion in the melt, though a number of small particles are observed in the diffused zone.3. It is confirmed that the diffusion coefficient calculated from the rate of reaction which is assumed to be controlled by diffusion in the melt coincides approximately with the values obtained by other methods.