Influence of Cr2O3 on the viscosity and crystallization behavior of glass ceramics based on blast furnace slag

Deng, Lei; Jia, Ruidong; Fei, Yun; Zhang, Xuefeng; Li, Hao; Zhou, Mingxing; Jia, Xiaolin; Ren, Da; Li, Baowei

doi:10.1016/j.matchemphys.2019.122212

Cited by 58 publications

(24 citation statements)

References 32 publications

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“…Here, the superscripts 0, 1, 2, and 3 are the number of bridging oxygen (BO) per

{SiO}_{4}^{4 ‐}

tetrahedron. [ 63–66 ] The degree of polymerization of the silicate melt was characterized by the amount of nonbridging oxygen per tetrahedron ( n (NBO/Si)) in the melt, evaluated according to Equation (3).

n (NBO / Si) = \sum x_{n} (4 - n)

…”

Section: Resultsmentioning

confidence: 99%

Evolution of Viscosity and Structure Property of Vanadium Slag during Iron‐Extracting Reduction Process

Zhang

Chen

Wang

et al. 2020

steel research int.

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Photovoltaic cutting waste (PCW) is a promising prereductant to enrich vanadium and to extract iron present in vanadium slag. To understand the kinetic conditions during the reduction and separation of Fe from vanadium slag when using PCW as a reductant, the evolution of the viscosity with decreasing FeO contents is measured. The composition and structure of the melt are analyzed using X‐ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. The results show that the slag comprises a solid–liquid mixture system during the entire prereduction at 1873 K. At this temperature, as the FeO/SiO2 mass ratio decreases from 2.18 to 0.30, the solid–liquid ratio of the slag decreases from 21.5% to 1.9%, and the viscosity of the slag increases from 0.12 to 0.47 Pa s, indicating that the silicate structure of the melt significantly affects the slag viscosity, while the effect of the spinel phase is limited. The transition of the dominant silicate structure from FeO to SiO2 results in a significant decrease in the amount of the simple unit Q0 as well as the occurrence of the more complex structural unit Q3, suggesting a significant enhancement of the degree of polymerization in the vanadium slag.

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“…Here, the superscripts 0, 1, 2, and 3 are the number of bridging oxygen (BO) per

{SiO}_{4}^{4 ‐}

n (NBO / Si) = \sum x_{n} (4 - n)

…”

Section: Resultsmentioning

confidence: 99%

Evolution of Viscosity and Structure Property of Vanadium Slag during Iron‐Extracting Reduction Process

Zhang

Chen

Wang

et al. 2020

steel research int.

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show abstract

“…decomposed into stretching vibration of silicon-oxygen tetrahedron with different degree of polymerization by Gaussian function, whose symbol is Q n , where n is the number of bridging oxygen (O b ) in the silicon-oxygen tetrahedron (n = 0, 1, 2, 3, 4, 5) [19,28]. Figure 5 was the Gaussian deconvolution diagram of the infrared vibration absorption peak at the range of 800 to 1200 cm -1 of the glass, and Table 5 was the peak position and relative area of Q n .…”

Section: Ftir Analysismentioning

confidence: 99%

STRUCTURE AND PROPERTIES OF GLASS-CERAMICS FROM BLAST FURNACE SLAG WITH DIFFERENT A l₂O₃/S iO₂ RATIO

Li¹

2021

Ceramics - Silikaty

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Different Al 2 O 3 /SiO 2 glass-ceramics were prepared from blast furnace slag by sintering method. The structure and properties of glasses or glass-ceramics were investigated by DSC, XRD, SEM, FTIR, 27 Al MAS NMR. The DSC results showed that with the increase of Al 2 O 3 /SiO 2 , the glass transition temperature (T g ) first decreased and then increased, reached the minimum when Al 2 O 3 /SiO 2 was 0.34. The volume density, bending strength and microhardness of glass-ceramics also showed the same variation rule. Structural analysis showed that when the Al 2 O 3 /SiO 2 increased from 0.19 to 0.34, Q 2 gradually transformed into Q 1 and Q 3 ; when the Al 2 O 3 /SiO 2 continued to increase from 0.34 to 0.39, Q 1 and Q 3 decreased while Q 2 increased. The variation of [AlO 4 ] and [AlO 6 ] made the glass network structure the loosest when Al 2 O 3 /SiO 2 was 0.34. Gehlenite was the main crystalline phase in glass-ceramics, and with the increase of Al 2 O 3 /SiO 2 , the precipitation of gehlenite increased, while the precipitation of diopside and hyalophane decreased.

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“…The vibration absorption peak in the range of 800-1200 cm − 1 can be decomposed into stretching vibration of silicon-oxygen tetrahedron with different degree of polymerization by Gaussian function (Fig. 5), whose symbol is Q n , where n is the number of bridging oxygen (O b ) in the silicon-oxygen tetrahedron (n = 0,1,2,3,4,5) [19,28]. Figure 5 was the Gaussian deconvolution diagram of the infrared vibration absorption peak at the range of 800-1200 cm − 1 of the series A glasses, and table 3 was the speci c peak values of each Q n .…”

Section: Ftir Analysismentioning

confidence: 99%

Effect of Al2O3/SiO2 on the structure and properties of blast furnace slag glass-ceramics

Zhang

et al. 2020

Preprint

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Different Al2O3/SiO2 glass-ceramics were prepared from blast furnace slag by traditional sintering method. The structure and properties of glasses or glass-ceramics were investigated by DSC, XRD, SEM, FTIR, 27Al MAS NMR. The DSC results showed that with the increase of Al2O3/SiO2, the glass transition temperature (Tg) first increased and then decreased, reached the minimum when Al2O3/SiO2 was 0.34. The volume density, bending strength and microhardness of glass-ceramics also showed the same variation rule. The FTIR and 27Al MAS NMR spectra results revealed this phenomenon. When Al2O3/SiO2 was 0.19, a large amount of Si4+ was added to the glass network to make the structure dense. With Al2O3/SiO2 increased from 0.24 to 0.34, the amount of [AlO6] in the glass increased while [AlO4] decreased, and the degree of network polymerization of the glass decreased; as Al2O3/SiO2 further increased from 0.34 to 0.39, [AlO4] increased and [AlO6] decreased in the glass, and the degree of network polymerization of the glass increased. The XRD results showed that the crystal phase of the glass-ceramics was composed of gehlenite, diopside and hyalophane. Moreover, with the increase of Al2O3/SiO2, the gehlenite content in the glass-ceramics increased, while the content of diopside and hyalophane decreased.

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Influence of Cr2O3 on the viscosity and crystallization behavior of glass ceramics based on blast furnace slag

Cited by 58 publications

References 32 publications

Evolution of Viscosity and Structure Property of Vanadium Slag during Iron‐Extracting Reduction Process

Evolution of Viscosity and Structure Property of Vanadium Slag during Iron‐Extracting Reduction Process

STRUCTURE AND PROPERTIES OF GLASS-CERAMICS FROM BLAST FURNACE SLAG WITH DIFFERENT A l₂O₃/S iO₂ RATIO

Effect of Al2O3/SiO2 on the structure and properties of blast furnace slag glass-ceramics

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