Abstract
The ingredients and formation mechanism of calcium iron manganese phase were confirmed and analyzed to comprehend further the hydration activity of tri-component f-CaO in four type steel slags. BSE-EDS analysis indicates that the tri-component f-CaO in four type steel slags was a phase of CaO·aFeOx·bMnOy system and the mean values of nFe/nCa, nMn/nCa and (nFe + nMn)/nCa were focused on nearby 0.12, 0.08 and 0.2, respectively. According to the relevant element ratio, the simply simulated experiments of tri-component f-CaO were conducted that the CaO-FeO-MnO system finite solid solution and a new crystalline phase of Ca2Fe2O5 were formed. The formation mechanism of CaO-FeO-MnO system finite solid solution was described briefly. By means of SEM-EDS, the microstructure of synthetic tri-component f-CaO was observed, and the analyses of XRD/TG-DTA and thermodynamic theory were applied to the hydration activity. The results show that the hydration percentage of tri-component f-CaO was about 80% after autoclaved for 3 h, and more than two times that of after hydrated at ambient temperature for 36 h. The CaO-FeO-MnO system solid solution was one of the critical factors which causes the poor hydration activity of tri-component f-CaO. This theoretical investigation will lay a foundation for building materials and solid waste fields.
Published Version
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