Abstract
When high-sulfur coal is burnt with lime, the mineral phases of fly ash may be discussed within a SiO2−Al2O3−CaO−CaSO4 system. By obtaining the absent thermochemical property data of the key mineral 3CaO·3Al2O3·CaSO4, the quaternary system was studied thermodynamically. It has been concluded that 2CaO·SiO2 and 3CaO·3Al2O3·CaSO4 may become the dominant minerals of the fly ash if sufficient solid phase reactions can be ensured. Because 3CaO·3Al2O3·CaSO4 and 2CaO·SiO2 are both important cement minerals, there will be great potential to improve the ash characteristics in combustion of high-sulfur coal. This finding gives substantial support to our previous studies of cement clinker cogeneration in pulverized coal combustion boilers. The results will also be very helpful to study the sulfur fixation in high-temperature combustion for which the formation of 3CaO·3Al2O3·CaSO4 is critical. In addition, the knowledge of the mechanism for involved chemical reactions may benefit the production of sulfoaluminate cement as well as the modification of portland cement.
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