Abstract
The Co2O3-doping effect on the formation of 3CaO·3Al2O3·CaSO4 from CaCO3-Al2O3-CaSO4·2H2O mixtures was investigated by means of SO2 emission behavior, chemical analysis, X-ray diffraction, differential thermal analysis and scanning electron microscopy. The experimental results show that Co2O3 addition increases the reactivity of the CaCO3-Al2O3-CaSO4·2H2O system significantly, by reducing SO2 emissions in combustion and f-CaO contents in the clinkers, promoting the nucleation and growth of 3CaO· 3Al2O3·CaSO4, and intensifying the formation of 3CaO·3Al2O3·CaSO4. Moreover, Co2O3 addition lowers the formation temperature of 3CaO·3Al2O3·CaSO4 by 18 °C, and similarly increases the thermal stability of it at a wider temperature range.
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