Understanding the Structure and Structural Effects on the Properties of Blast Furnace Slag (BFS)

Sajid, Muhammad; Bai, Chenguang; Aamir, Muhammad; You, Zhixiong; Yan, Zhiming; Lv, Xuewei

doi:10.2355/isijinternational.isijint-2018-453

Cited by 51 publications

(23 citation statements)

References 79 publications

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“…It can be seen that the structure of the glass was connected by a three-dimensional network of [SiO 4 ] tetrahedrons (red) and [AlO 4 ] tetrahedrons (yellow). Ca (dark blue), Mg (light blue), and Na (green) filled in the gaps of the network structure [38,39]. As Al 2 O 3 was replaced by RO, the [AlO 4 ] tetrahedrons content in the glass decreased, and the structure of network was gradually filled with Mg and Ca.…”

Section: Local Structure Of the Glassmentioning

confidence: 99%

EFFECT OF Al₂O₃-RO RATIO ON THE STRUCTURE AND PROPERTIES OF ALKALINE EARTH ALUMINOSILICATE GLASS BASED ON THE MOLECULAR DYNAMICS SIMULATION

Yang¹

2022

Ceramics - Silikaty

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The molecular dynamics (MD) simulation method was used to study the influence of the Al 2 O 3 -RO (R = Ca, Mg) ratio on the structure and properties of CaO-MgO-Al 2 O 3 -SiO 2 -Na 2 O glass at high temperatures. The micro-structure characteristics, degree of network polymerisation (DNP), and high-temperature viscosity of the glass melts were analysed. The results showed that the coordination number of Si 4+ and Al 3+ remained about 4 in the process of replacing Al 2 O 3 with RO. The silicon-oxygen and aluminium-oxygen tetrahedron content showed a decreasing trend with a decrease in the Al 2 O 3 content, the bridging oxygen content decreased, and the degree of the network polymerisation of the glass decreased from 3.33 to 2.79. The decrease in the Al 2 O 3 content also caused a rapid decrease in the glass fibre-forming temperature from 1637.66 K to 1552.87 K. According to the molecular dynamics calculation, the linear relationship between the DNP and fibre-forming temperature was obtained.

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Section: Local Structure Of the Glassmentioning

confidence: 99%

EFFECT OF Al₂O₃-RO RATIO ON THE STRUCTURE AND PROPERTIES OF ALKALINE EARTH ALUMINOSILICATE GLASS BASED ON THE MOLECULAR DYNAMICS SIMULATION

Yang¹

2022

Ceramics - Silikaty

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“…The second parameter, i.e., the viscosity, depends on the structural parameters of the slag, such as the degree of polymerization of the slag as well as cation effects, including charge compensation and differences in cation sizes. [56] Mills and Sridhar [49] modeled the structural dependency of slags to the viscosity by utilizing the corrected optical basicity. Further development of the correlation between the viscosity and optical basicity was introduced by Ray and Pal.…”

Section: E the Corrected Optical Basicity And The Apparent Rate Consmentioning

confidence: 99%

The Quantitative Effect of Blast Furnace Slag Composition and Temperature on the Kinetics of Potassium Evaporation

Andersson

Ahmed

Ökvist

et al. 2020

Metall Mater Trans B

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Increased in-plant recycling and lower quality raw material in terms of alkali content drive the alkali load in the blast furnace (BF) to higher levels. Excessive load of alkalis, primarily potassium, has several negative effects on the BF operation, which necessitates means to control the removal of potassium from the BF. One method to improve the removal is by increasing the potassium retention in the slag, which is controlled by the evaporation kinetics of potassium. Although several authors have studied factors affecting the evaporation rate, none of these studies have quantitatively investigated the effect of these parameters and attempted to relate these effects to slags from the industry. In the present work, a full-factorial design of experiments with three factors (B2 basicity, MgO content, and temperature) was performed, studying the evaporation of potassium from synthetic BF slag. The results suggested that multiple linear regression is suitable to describe the evaporation kinetics of potassium within the boundaries of the design of experiments. However, extrapolating to industrial slags of different compositions and additional slag components is best performed utilizing the corrected optical basicity. The corrected optical basicity showed a linear relation to the evaporation kinetics of potassium, which was related to the correlation between diffusivity and corrected optical basicity.

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“…The chemical composition of slag varies depending on the composition of iron ore, fluxing stone, and impurity of the coke fed into the furnace (Özbay et al, 2016; Sajid et al, 2019). Normally, owing to its lower density, molten slag floats on top of molten iron liquid in the furnace upon combining lime, silica, alumina, and magnesia and could be identified as a CaO−SiO 2 −Al 2 O 3 −MgO system.…”

Section: Introductionmentioning

confidence: 99%

EDS Microanalysis of Unhydrated Blast Furnace Slag Grains in Field Concrete with Different Service Life

Zhang

Saravanakumar²,

Çopuroğlu³

2022

Microscopy and Microanalysis

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Because the essential quality metrics of blast furnace slag are based on its oxide composition, the determination of chemical compositions of unhydrated slag grains in an aged concrete could be useful for understanding its past performance and in predicting the remaining service life of existing slag-bearing concrete. In this research, the authors explored the feasibility of using standard-based energy-dispersive X-ray spectroscopy (EDS) microanalysis, in tandem with electron imaging, as a tool for quantitative measurement of the chemical composition of blast furnace slag grains in cement/concrete. In the experimental study, seven concrete samples representing various service life durations were collected in the Netherlands. The microanalysis results of the samples revealed that the change in slag chemistry is insignificant for samples B (1985) to F (2006); however, elevated CaO and SiO2 contents are found in slag used for sample G (2015), opposite to that of Al2O3 and MgO. After discussing compositional characterization, the paper discusses favorable microanalysis protocols for acceptable elemental quantification accuracy. It was concluded that quantitative EDS microanalysis is a strong tool to characterize the chemical composition of unhydrated slag used in field concrete, which could potentially contribute to understanding the correlations between composition and long-term performance in slag concrete structures.

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Understanding the Structure and Structural Effects on the Properties of Blast Furnace Slag (BFS)

Cited by 51 publications

References 79 publications

EFFECT OF Al₂O₃-RO RATIO ON THE STRUCTURE AND PROPERTIES OF ALKALINE EARTH ALUMINOSILICATE GLASS BASED ON THE MOLECULAR DYNAMICS SIMULATION

EFFECT OF Al₂O₃-RO RATIO ON THE STRUCTURE AND PROPERTIES OF ALKALINE EARTH ALUMINOSILICATE GLASS BASED ON THE MOLECULAR DYNAMICS SIMULATION

The Quantitative Effect of Blast Furnace Slag Composition and Temperature on the Kinetics of Potassium Evaporation

EDS Microanalysis of Unhydrated Blast Furnace Slag Grains in Field Concrete with Different Service Life

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