A Review on Stabilization of Ladle Furnace Slag-Powdering Issue

Dash, Abinash; Chanda, Prasenjit; Tripathy, P. K.; Kumar, Nikhil

doi:10.1007/s40831-022-00597-7

Cited by 9 publications

(2 citation statements)

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“…Recently published reviews on steel slags covered detailed analyses of the chemical and mineralogical properties of slags as well as a broad spectrum of potential applications in construction materials [2][3][4][5][6][7][8][9][10], wastewater treatment [4], and carbon dioxide sequestration [5]. Other reviews focused on properties [1,11] and characteristics of different types of steel slag. These reviews considered the application of BOF, EAF, Linz-Donawitz (LD), ground granulated blast furnace (GGBF), and LF slag, emphasizing the reuse of BOF and EAF slags.…”

Section: Introductionmentioning

confidence: 99%

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Ladle Furnace Slag: Synthesis, Properties, and Applications

Jacob

2023

ChemBioEng Reviews

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Ladle slag is a byproduct formed during the ladle refining stage of steel making. It is a dusty material that has been considered industrial waste. Technical advancements towards a sustainable industry led to the development of different applications for ladle slag. Depending on the processing methods during the steel slag production and the weathering of the slag post‐production, the elemental composition of the steel slag largely varies. Owing to this, its characteristics cannot be generalized and specific applications depending on the sources are developed. It is generally used in construction materials, soil rejuvenation, and CO2 capture. This paper reviews the production process, the mineralogical and morphological properties, stabilization techniques, and the applications of ladle furnace (LF) slag. One of the prime focuses of waste remediation and sustainable industry is to find meaningful ways to turn waste into products. In this respect, a comprehensive review of the properties of LF slag and its current application will help provide a framework for the development of future sustainability goals. With increased slag usage, the ladle refining process of steelmaking can be turned into a more carbon‐neutral process.

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Section: Introductionmentioning

confidence: 99%

“…Varanasi et al [13] studied the recycling of LF slag as a flux in steel making. Dash et al [11] reviewed the powdering problem in LF slag and methods for stabilization.…”

Section: Introductionmentioning

confidence: 99%

Ladle Furnace Slag: Synthesis, Properties, and Applications

Jacob

2023

ChemBioEng Reviews

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Chemical Range of Stability for Self-Dusting Ladle Furnace Slags and Destabilizing Effect of Sulfur

Mombelli,

Dall’Osto,

Fumagalli

et al. 2023

J. Sustain. Metall.

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Ladle furnace slags are characterized by volumetric expansions associated with the transition of dicalcium silicate (C2S) from β to γ phase, which generates fine dust during cooling, causing handling and storage issues that further reduce their recycling opportunities. The present work focuses on the effect of slag basicity on dusting and the role of sulfur on slag stability. Seven synthetic ladle slag precursors were made by mixing lime, magnesia, quartz and alumina in different proportions to match effective industrial compositions, increasing the binary basicity and keeping the ternary and quaternary indexes unchanged. Samples were heated to 1500 °C for 15 min and monitored during air cooling (< 5 °C/s) through thermocouples and camera to characterize the behavior, temperature, and time interval of dusting. The cooled samples were characterized chemically, mineralogically and morphologically. Starting from the chemistry of a self-stabilized slag, five additional slag precursors, characterized by increasing amounts of S, were created and analyzed using the same procedures. Experimental evidence showed the presence of three different dusting behaviors (stable, partial and complete) and stabilization of the slag once an optical basicity of 0.748 or higher was reached. In addition, mayenite was identified as the main phase capable of suppressing the β to γ transition by exerting hydrostatic pressure on C2S. Finally, although S can stabilize the β phase when dissolved in it, after saturation it precipitates as CaS, which can react with mayenite, locally decreasing the optical basicity and allowing dusting. Graphical Abstract

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