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Article

A Study of the Crystallization Properties of CaO-SiO2-Al2O3 Glass Phase in Sinter

State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083, China
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Academic Editor: Timo Fabritius
Metals 2022, 12(6), 915; https://doi.org/10.3390/met12060915
Received: 1 May 2022 / Revised: 21 May 2022 / Accepted: 24 May 2022 / Published: 26 May 2022
(This article belongs to the Special Issue Thermodynamics and Kinetics in Metallurgical Processes)
The glass phase is one of the binding phases in high-basicity sinter, which is mainly formed during a high-temperature cooling process while cannot crystallize in time. The phase still involves the “structure” information of the binding phase’s liquid phase in the sinter. In addition, the generation of glassy phases can seriously deteriorate the metallurgical properties of sintered ore. However, the formation mechanism and crystallization process of glass phases are still unclear. In this work, the glass phase and the crystallized samples of the CaO-SiO2-Al2O3 system were characterized using X-ray diffraction, optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy and Raman spectroscopy. The effect of alkalinity (R) and Al2O3 on crystallization and the relationship between crystallization and structure are discussed. The results showed that the chemical composition significantly influences the crystallization of the CaO-SiO2-Al2O3 glass. Decreasing basicity (R = 0.8–1.2, the mass ratio of CaO and SiO2) favors the crystallization of the glass phase, while increasing the content of Al2O3 (9–12%) can inhibit the crystallization of the glass phase. In addition, the crystallization order of the 45mass%CaO-45mass%SiO2-10mass%Al2O3 sample is CaSiO3 → CaAl2O4. Raman spectroscopic analysis showed that increase of slag basicity promoted the aggregation degree (Q3/Q2), resulting in deterioration of the glass phase crystallization. and that the glass phase crystallization deteriorated as the aggregation degree increased. However, increasing the Al2O3 content has little effect on the agglomeration degree but does promote the formation of SiO4 tetrahedra (Q0), which results in the deterioration of glass-phase crystallization. View Full-Text
Keywords: sinter; CaO-SiO2-Al2O3 slag system; glass phase; crystallization; Raman spectroscopy sinter; CaO-SiO2-Al2O3 slag system; glass phase; crystallization; Raman spectroscopy
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MDPI and ACS Style

Xin, R.-F.; Guo, X.-M. A Study of the Crystallization Properties of CaO-SiO2-Al2O3 Glass Phase in Sinter. Metals 2022, 12, 915. https://doi.org/10.3390/met12060915

AMA Style

Xin R-F, Guo X-M. A Study of the Crystallization Properties of CaO-SiO2-Al2O3 Glass Phase in Sinter. Metals. 2022; 12(6):915. https://doi.org/10.3390/met12060915

Chicago/Turabian Style

Xin, Rui-Feng, and Xing-Min Guo. 2022. "A Study of the Crystallization Properties of CaO-SiO2-Al2O3 Glass Phase in Sinter" Metals 12, no. 6: 915. https://doi.org/10.3390/met12060915

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