Study of clinker dopped with P and S compounds

Reusing Desulfurization Slag in Cement Clinker Production and the Influence on the Formation of Clinker Phases

“…The results suggest that the variations of β-Ca2SiO4 and γ-Ca2SiO4 are highly associated with the formation of Ca3SiO5, and the temperature range between 1300 and 1350 °C seems to be the crucial stage in the clinkerization process. 20 30 40 50 60 70 In Figure 5b, the variation of the crystalline phases in the clinker C1 between 1200 and 1400 • C broadly resembles that in the clinker C0. From 1200 to 1300 • C, the diffraction intensity of β-Ca 2 SiO 4 decreased while that of γ-Ca 2 SiO 4 increased.…”

“…The results show that the De-S slag has a significant effect on the formation of Ca3SiO5. Some previous studies [20,32] found that the CaO and Ca2SiO4 that remain in clinkers often increase simultaneously as Ca3SiO5 decreases, because Ca2SiO4 is stabilized by some elements, thus inhibiting the combination with CaO to form Ca3SiO5. However, there was little Ca2SiO4 observed in the XRPD patterns of the clinkers in this study.…”

“…The results show that the De-S slag has a significant effect on the formation of Ca 3 SiO 5 . Some previous studies [20,32] Table 3 lists the results of the fusibility tests for the cement raw mixes. For the raw mixes C0 and C1, there were no ST points recorded up to 1400 °C.…”

“…Moreover, the stabilization of a clinker phase may occur when foreign ions are incorporated into the crystal structure. Kolovos et al [20] studied the clinkers doped with phosphorous and sulfur compounds, and reported that the melt phase began to form at relatively low temperatures. The viscosity of the melt phase was also reduced when sulfur was present in the clinkerization process.…”

Reusing pretreated desulfurization slag to improve clinkerization and clinker grindability for energy conservation in cement manufacture

“…Several researchers have found that CaS and CaF 2 , which are present in DS, are beneficial to clinkerization during the sintering process (Odler and Abdul-Maula, 1980;Taylor, 1997;Altun, 1999;Kolovos et al, 2001;Kolovos et al, 2004). Kolovos et al (2004) reported that CaS improved the reactivity of the raw mix and that belite formation was shifted to a relatively low temperature. Odler and Abdul-Maula (1980) found that CaF 2 accelerated the rate of cement clinker formation, and the temperature range at which alite formed in the presence of CaF 2 was extended to lower values.…”