Abstract
CaO-Al2O3-SiO2 glass-ceramics was prepared from phosphogypsum and studied by differential thermal analysis (DTA) and X-ray diffraction (XRD). CaSO4 in phosphogypsum decomposed into CaS and then it reacted with CaSO4 forming CaO and SO2 when the most energy-efficient reaction by Factsage calculated. SiO2, AlPO4, CaSiO3 (wollastonite-1A) and CaSiO3 (calcium silicate) were identified as the main phases in the glass-ceramics prepared from phosphogypsum.
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