The effect of Cr2O3 and P2O5 additions on the phase transformations during the formation of calcium sulfoaluminate C4A3(S)over-bar

The study describes the influence of chromium and phosphorus additions on the phase transformations during the formation of the calcium sulfoaluminate Ca4Al6SO16 from CaCO3-Al2O3-CaSO4 mixtures. The temperatures of decarbonation reaction were measured by means of differential thermal analysis. The enthalpy variations at different heating temperatures were determined by isothermal calorimetry. The results show that the Cr2O3 and P2O5 additions lower the onset temperature of decarbonation. The energy requirement at high temperature of the doped mixtures is less, compared to that of mixtures without dopants. The formation of solid solutions is followed by Xray diffraction. The higher concentrations of additives hinder the formation of the C(4)A(3)(S) over bar phase. (C) 2005 Elsevier Ltd. All rights reserved.