Basic oxygen furnace slag: Review of current and potential uses

Naidu, Tamlyn Sasha; Sheridan, Craig; Dyk, Lizelle Doreen van

doi:10.1016/j.mineng.2020.106234

Cited by 100 publications

(30 citation statements)

References 150 publications

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“…The basicity (CaO/SiO 2 ratio) and free lime content of these industrial slag samples were 3.41 and 3.33 mass%, respectively . The concentrations of slag components (e.g., CaO, SiO 2 , Al 2 O 3 , MgO, MnO, P 2 O 5 , S, and total Fe) were similar to those reported for typical BOF slags (Juckes, 2003;Naidu et al, 2020;Nippon Slag Association, 2020). The sample surface was polished using 600, 1,200, and 2,400-grit abrasive papers and finished using 1-μm diamond slurry; then, the samples were placed for 5 min in a box furnace pre-heated at 1,000°C in air and successively extracted and blown with argon gas for quenching to room temperature.…”

Section: Methodssupporting

confidence: 81%

Effect of Reheating and Quenching on the Cathodoluminescence Intensity of Free Lime in Steelmaking Slag

2021

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Section: Methodssupporting

confidence: 81%

Effect of Reheating and Quenching on the Cathodoluminescence Intensity of Free Lime in Steelmaking Slag

2021

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“…Around 70% of the world's steel production depends directly on the blast furnace process (integral route), as the availability of scrap limits electric arc furnace production to 30% of global demand [25]. In 2008 between 230 and 280 million tonnes of BOF slag were produced globally [26] and current slag generation is estimated to be between 200 and 250 kg per tonne of steel produced [27]. The environmental impacts of this large amount of slag generated and accumulated has prompted scientists and engineers to work on novel solutions based on more eco-friendly industrial concepts [28,29].…”

Section: Introductionmentioning

confidence: 99%

Application of Steel Slag for Degraded Land Remediation

Díaz-Piloñeta

Fernández

Terrados-Cristos

et al. 2022

Land

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Land degradation, and especially acidification, are global issues that need to be addressed. A common practice to correct this problem is the use of lime or chemical fertilisers that involve the extraction of raw materials. This study proposes a more sustainable alternative using Basic Oxygen Furnace (BOF) slag. BOF slag is the main waste from the steel industry that is usually accumulated in landfills, which also implies environmental impacts. In this study, a series of laboratory tests have been carried out to analyse the feasibility of using BOF slag for the reclamation of degraded land. For soil acidification, BOF slag will be analysed as a liming agent. On the other hand, the benefits slag can provide as a nutrient source will be tested. As an added value, pre-treated and untreated slag will be compared. The results of these short-time experiments show how BOF slag could be a sustainable alternative as liming agent and amendment. Its use increased the levels of some micro and macronutrients available for plant growth and improved soil quality. It could, therefore, be a sustainable management practice that makes an important contribution to the circular economy.

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“…A significant amount of basic oxygen furnace (BOF) slag is generated in the converter steelmaking process. 1 The BOF slag is a kind of multi-component solid waste, the main mineralogical phases of which are dicalcium silicate (Ca 2 SiO 4 ), tricalcium silicate (Ca 3 SiO 5 ), phosphoruscontaining solid solution (nCa 2 SiO 4 -Ca 3 (PO 4 ) 2 ), RO phase (R = Mg 2+ , Mn 2+ , Fe 2+ , Ca 2+ ), dicalcium ferrite (2CaO⋅Fe 2 O 3 ), and merwinite (3CaO⋅MgO⋅2SiO 2 ), etc. 2,3 The massive accumulation of BOF slag causes serious environmental pollution, such as farmland alkalization, dust pollution, and the leaching of heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Dissolution behavior of silica in molten CaO–SiO₂–Fe₂O₃–MgO–MnO slag

et al. 2022

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The modification of basic oxygen furnace (BOF) slag by adding silica can improve the properties of BOF slag for applications in the cement industry. The rapid dissolution of silica is essential to hot slag modification. In this work, the dissolution behavior of silica in the molten CaO–SiO2–Fe2O3–MgO–MnO system as synthetic BOF slag was investigated by using the traditional rotating cylinder technique. Effects of rotation speed, temperature, immersion time, and slag basicity on the silica dissolution were studied. Scanning electron microscopy equipped with energy dispersive spectrometer (SEM‐EDS) and FactSage simulations were employed to reveal the dissolution mechanism. It was found that the dissolution of the silica rod was affected by both the thermodynamic driving force and the slag viscosity. The silica dissolution rate in molten CaO–SiO2–Fe2O3–MgO–MnO slag increased with increasing the rotation speed and temperature, but first increased and then decreased when decreasing the slag basicity from 2.5 to 1.5. A linear correlation between the logarithm of the dissolution rate and the logarithm of cylinder periphery velocity with a slope of 0.44 was observed, indicating the mass transfer within the boundary layer as the dissolution rate determining step. A direct dissolution way was found during the dissolution of silica in molten CaO–SiO2–Fe2O3–MgO–MnO slag.

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Basic oxygen furnace slag: Review of current and potential uses

Cited by 100 publications

References 150 publications

Effect of Reheating and Quenching on the Cathodoluminescence Intensity of Free Lime in Steelmaking Slag

Effect of Reheating and Quenching on the Cathodoluminescence Intensity of Free Lime in Steelmaking Slag

Application of Steel Slag for Degraded Land Remediation

Dissolution behavior of silica in molten CaO–SiO₂–Fe₂O₃–MgO–MnO slag

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Basic oxygen furnace slag: Review of current and potential uses

Cited by 100 publications

References 150 publications

Effect of Reheating and Quenching on the Cathodoluminescence Intensity of Free Lime in Steelmaking Slag

Effect of Reheating and Quenching on the Cathodoluminescence Intensity of Free Lime in Steelmaking Slag

Application of Steel Slag for Degraded Land Remediation

Dissolution behavior of silica in molten CaO–SiO2–Fe2O3–MgO–MnO slag

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Dissolution behavior of silica in molten CaO–SiO₂–Fe₂O₃–MgO–MnO slag