Abstract
This investigation aims at gaining in-depth knowledge for the cement clinker production by utilizing phosphogypsum (PG) and oil shale (OS) as raw materials. The raw mixtures (Raw Mix I and Raw Mix II) were burnt in a muffle furnace and then analyzed by X-ray diffraction (XRD) to observe the phases obtained. While fluorellestadite (Ca 10(SiO 4) 3(SO 4) 3F 2) and akermanite (Ca 2MgSi 2O 7) phases were observed with the Raw Mix I composed of 51.43% PG, 16.59% OS, 8.23% stone coal (SC) and 23.75% kaolinite clay (KC) in N 2 atmosphere at the temperature range of 1200–1300°C, the mineralogical phase belite (β-C 2S) of Portland cement (PC) was formed even at 1200°C by using the raw mixtures (Raw Mix II) composed of 35.84% PG, 11.56% OS, 5.73% SC, 16.55% C and 30.32% CaO. The intensity and the amount of belite peaks were increased with increasing burning temperature.
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