A Study of the Crystallization Properties of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Glass Phase in Sinter
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...
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MDPI AG
2022-05-01
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| Online Access: | https://www.mdpi.com/2075-4701/12/6/915 |
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| author | Rui-Feng Xin Xing-Min Guo |
| author_facet | Rui-Feng Xin Xing-Min Guo |
| author_sort | Rui-Feng Xin |
| collection | DOAJ |
| description | 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-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> system were characterized using X-ray diffraction, optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy and Raman spectroscopy. The effect of alkalinity (R) and Al<sub>2</sub>O<sub>3</sub> 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-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> glass. Decreasing basicity (R = 0.8–1.2, the mass ratio of CaO and SiO<sub>2</sub>) favors the crystallization of the glass phase, while increasing the content of Al<sub>2</sub>O<sub>3</sub> (9–12%) can inhibit the crystallization of the glass phase. In addition, the crystallization order of the 45mass%CaO-45mass%SiO<sub>2</sub>-10mass%Al<sub>2</sub>O<sub>3</sub> sample is CaSiO<sub>3</sub> → CaAl<sub>2</sub>O<sub>4</sub>. Raman spectroscopic analysis showed that increase of slag basicity promoted the aggregation degree (Q<sub>3</sub>/Q<sub>2</sub>), resulting in deterioration of the glass phase crystallization. and that the glass phase crystallization deteriorated as the aggregation degree increased. However, increasing the Al<sub>2</sub>O<sub>3</sub> content has little effect on the agglomeration degree but does promote the formation of SiO<sub>4</sub> tetrahedra (Q<sub>0</sub>), which results in the deterioration of glass-phase crystallization. |
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| last_indexed | 2024-03-09T23:04:22Z |
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| spelling | doaj.art-cceae01c06c44e3fb9714378f253afca2023-11-23T17:57:13ZengMDPI AGMetals2075-47012022-05-0112691510.3390/met12060915A Study of the Crystallization Properties of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Glass Phase in SinterRui-Feng Xin0Xing-Min Guo1State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083, ChinaThe 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-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> system were characterized using X-ray diffraction, optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy and Raman spectroscopy. The effect of alkalinity (R) and Al<sub>2</sub>O<sub>3</sub> 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-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> glass. Decreasing basicity (R = 0.8–1.2, the mass ratio of CaO and SiO<sub>2</sub>) favors the crystallization of the glass phase, while increasing the content of Al<sub>2</sub>O<sub>3</sub> (9–12%) can inhibit the crystallization of the glass phase. In addition, the crystallization order of the 45mass%CaO-45mass%SiO<sub>2</sub>-10mass%Al<sub>2</sub>O<sub>3</sub> sample is CaSiO<sub>3</sub> → CaAl<sub>2</sub>O<sub>4</sub>. Raman spectroscopic analysis showed that increase of slag basicity promoted the aggregation degree (Q<sub>3</sub>/Q<sub>2</sub>), resulting in deterioration of the glass phase crystallization. and that the glass phase crystallization deteriorated as the aggregation degree increased. However, increasing the Al<sub>2</sub>O<sub>3</sub> content has little effect on the agglomeration degree but does promote the formation of SiO<sub>4</sub> tetrahedra (Q<sub>0</sub>), which results in the deterioration of glass-phase crystallization.https://www.mdpi.com/2075-4701/12/6/915sinterCaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> slag systemglass phasecrystallizationRaman spectroscopy |
| spellingShingle | Rui-Feng Xin Xing-Min Guo A Study of the Crystallization Properties of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Glass Phase in Sinter Metals sinter CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> slag system glass phase crystallization Raman spectroscopy |
| title | A Study of the Crystallization Properties of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Glass Phase in Sinter |
| title_full | A Study of the Crystallization Properties of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Glass Phase in Sinter |
| title_fullStr | A Study of the Crystallization Properties of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Glass Phase in Sinter |
| title_full_unstemmed | A Study of the Crystallization Properties of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Glass Phase in Sinter |
| title_short | A Study of the Crystallization Properties of CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Glass Phase in Sinter |
| title_sort | study of the crystallization properties of cao sio sub 2 sub al sub 2 sub o sub 3 sub glass phase in sinter |
| topic | sinter CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> slag system glass phase crystallization Raman spectroscopy |
| url | https://www.mdpi.com/2075-4701/12/6/915 |
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