Formation kinetics and transition mechanism of CaO·SiO2 in low-calcium system during high-temperature sintering

来源期刊:中南大学学报(英文版)2020年第11期

论文作者:潘晓林 崔维学 张灿 于海燕

文章页码:3269 - 3277

Key words:calcium silicate compounds; formation kinetics; crystal structure; microstructure; sinter process

Abstract: The crystal structure, formation kinetics and micro-morphology of CaO·SiO2 during high-temperature sintering process were studied in low-calcium system by XRD, FT-IR, Raman and SEM-EDS methods. When the molar ratio of CaCO3 to SiO2 is 1.0, β-2CaO·SiO2 forms firstly during the heating process, and then CaO·SiO2 is generated by the transformation reaction of pre-formed 2CaO·SiO2 with SiO2. 3CaO·SiO2 and 3CaO·2SiO2 do not form either in the heating or sintering process. Rising the sintering temperature and prolonging the holding time promote the phase transition of 2CaO·SiO2 to CaO·SiO2, resulting in the sintered products a small blue shift and broadening in Raman spectra. The content of CS can reach 97.4% when sintered at 1400 °C for 1 h. The formation kinetics of CaO·SiO2 follows the second-order chemical reaction model, and the corresponding apparent activation energy and pre-exponential factor are 505.82 kJ/mol and 2.16×1014 s-1 respectively.

Cite this article as: PAN Xiao-lin, CUI Wei-xue, ZHANG Can, YU Hai-yan. Formation kinetics and transition mechanism of CaO·SiO2 in low-calcium system during high-temperature sintering [J]. Journal of Central South University, 2020, 27(11): 3269-3277. DOI: https://doi.org/10.1007/s11771-020-4545-1.

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