Preparation of CaO-Al2O3-SiO2 system glass from molten blast furnace slag

Quaternary glasses with the composition 50SiO2-25TiO2-5La2O3-(20-x) Na2O-xY2O3 where : (0 ≤ ≥ 10) were synthesized using the melt-quench technique. XRD examined the nature of prepared glasses. UV-spectroscopic of investigated glass system studied at room temperature. Both optical bandgap and refractive index of the present glass have been increased. The polarizability and basicity were determined. Thermal parameter values increased as Y2O3 increased. Under controlling heat, the glass-ceramic were prepared and confirmed using XRD. Glass-ceramics are examined using SEM to evaluate a microstructure. Ultrasonic velocities and elastic-moduli of glass-ceramic samples are increased because of the increase in internal energy. The role of Y2O3 modifier in the glass system is clearly demonstrated. Y2O3 also works as an excellent nucleating agent that can induce crystallizations, supporting in the creation of the sub-phase of glass-ceramics.

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“…Figure 12b illustrations the micrographically (G6). It is indicated that uniform distributions in the glass composition [50].…”

Section: Xrd and Sem Analysis For Consistent Ceramic-glassmentioning

confidence: 99%

Optical Properties of SiO2 – TiO2 – La2O3 – Na2O – Y2O3 Glasses and A Novel Process of Preparing the Parent Glass-Ceramics

El‐Rehim

Wahab

Halaka

et al. 2021

Silicon

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“…As with nearly two decades of the rapid development of solid nuclear magnetic technology, especially for MAS NMR, which has been applied to the field of silicate building materials, researchers have conducted a large number of preliminary studies on the structure of vitreous in slag [27,28]. Significant advances include the coordination states of elements in a series of geopolymers (dominated by slag, fly ash, metakaolin, and so forth) and the possible bridging patterns of these ligands [29,30]; the role of ligands and metal cations in the formation of amorphous phase networks [31,32]; the structural variational characteristics of slag during hydration; and of gel-like hydration products [33,34]. Researches generally take industrial slag as the samples by which several inevitable effects come out.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Formation of Amorphous Networks on the Structure and Hydration Characteristics of Granulated Blast Furnace Slag

et al. 2020

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The slag obtained in the process of pig iron smelting has been widely used, but the variational hydration activity always is a significant factor affecting its quality. In this experiment, the laboratory simulated slag was prepared by adjusting the chemical composition and cooling method. The experiment primary characterized the structure and hydration process with different types of slag by using MAS NMR, XRD, compressive strength, ICP, SEM, and hydration heat, then obtained the influence of the composition of the network former S/A (the mass ratio of SiO2 and Al2O3 in chemical composition) and amorphous phase content on its structure and hydration activity. The result shows that lowering the S/A value can reduce the degree of vitreous polymerization in the slag; reducing the S/A value of the slag can make the slag hydration time advance, and consequently, the cumulative exotherm increases, the liquid phase Ca/Si and Al/Si ionic ratio increases, and the hydration product changes from C–S–H gel to C–A–S–H gel, which ultimately leads to an increase in compressive strength. In the high S/A value slag, the formation of the trace crystal phase of gehlenite is beneficial to reduce the degree of polymerization of the amorphous.

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“…1,2 Comparing with stockpiling, the direct utilization of molten BF slag has attracted the attention of many scholars and institutions due to its environmental friendly and commercial prospect. [3][4][5] The preparation of glass ceramics from blast furnace slag has a large commercially added value, and is recognized as an efficient way among the different methods of recycling molten BF slag. [4][5][6] And to guarantee the excellent properties of glass ceramics, other chemicals like SiO 2 , Al 2 O 3 , and alkali metal oxides were usually added into the slag melt.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] The preparation of glass ceramics from blast furnace slag has a large commercially added value, and is recognized as an efficient way among the different methods of recycling molten BF slag. [4][5][6] And to guarantee the excellent properties of glass ceramics, other chemicals like SiO 2 , Al 2 O 3 , and alkali metal oxides were usually added into the slag melt. [7][8][9] Recently, there have been major advances in the preparation of glass ceramics using modified molten BF slag.…”

Section: Introductionmentioning

confidence: 99%

Structure, viscosity, and crystallization of glass melt from molten blast furnace slag

Zhang

Xiao

et al. 2020

Int J of Appl Glass Sci

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Molten blast furnace slag (BF slag) was modified using liquid‐liquid mixing method for glass ceramics preparation, and the structure and viscosity of glass melt after modification were investigated. The BF slag proportion increased from 52.72 wt. % to 67.05 wt. %, and CaO/(SiO2 + Al2O3) also varied from 0.33 to 0.47. The structure of BF slag melt after modification was investigated using 29Si and 27Al MAS NMR spectra. With increasing CaO/(SiO2 + Al2O3), the amount of Q1 remarkably increased while that of Q2 decreased significantly. Specifically, when CaO/(SiO2 + Al2O3) was more than 0.38, Q3 disappeared in glass melt. The viscosity of glass melt with CaO/(SiO2 + Al2O3) of 0.47 exhibited a steep change at 1169°C, which was mainly caused by the sufficient crystallization of gehlenite confirmed by DTA cooling analysis, XRD, and FE‐SEM‐EDS analysis.

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Preparation of CaO-Al2O3-SiO2 system glass from molten blast furnace slag

Cited by 12 publications

References 15 publications

Optical Properties of SiO2 – TiO2 – La2O3 – Na2O – Y2O3 Glasses and A Novel Process of Preparing the Parent Glass-Ceramics

Optical Properties of SiO2 – TiO2 – La2O3 – Na2O – Y2O3 Glasses and A Novel Process of Preparing the Parent Glass-Ceramics

Effect of the Formation of Amorphous Networks on the Structure and Hydration Characteristics of Granulated Blast Furnace Slag

Structure, viscosity, and crystallization of glass melt from molten blast furnace slag

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