Thermodynamic simulations and isothermal solubility diagrams as tools for slag foaming control

Luz, A.P.; Ávila, Thiago A.; Bonadia, P.; Pandolfelli, V. C.

doi:10.1016/j.ceramint.2011.04.020

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…The software FactSage 6.4 was used for all calculations in this study. This software has been used in several studies of primary 16,17 and secondary 18,19 refining slag.…”

Section: Methodsmentioning

confidence: 99%

MgO Saturation Analisys of CaO-SiO2-FeO-MgO-Al2O3 Slag System

et al. 2017

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Electric arc furnace (EAF) slag has a range of functions, including improving energy efficiency through the "slag foaming" phenomenon. As such, the study of slag is important in EAFs. One of the factors that determine foaming quality and efficiency is the presence of solid particles. MgO saturation is highly significant since, in addition to ensuring the presence of solid particles, it also ensures chemical compatibility to minimize refractory consumption. The present study aims to examine MgO saturation, using the software FactSage v.6.4 for all calculations, in the CaO-SiO 2-FeO-MgO-Al 2 O 3 slag system and the influence of binary basicity, FeO and Al 2 O 3 content on this system. Ternary diagrams revealed the influence of Al 2 O 3 content on the liquid field and other phases present. Isothermal saturation diagrams (ISDs) were constructed, showing the same dual saturation points found in the ternary diagrams. The ISDs were validated by comparing the results of different heats in terms of the electrical energy consumption. The closer the heat is to the MgO saturation line, the less energy is consumed.

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“…The software FactSage 6.4 was used for all calculations in this study. This software has been used in several studies of primary 16,17 and secondary 18,19 refining slag.…”

Section: Methodsmentioning

confidence: 99%

MgO Saturation Analisys of CaO-SiO2-FeO-MgO-Al2O3 Slag System

et al. 2017

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“…All calculations were carried out under an atmospheric pressure, and the experimental atmosphere was air. The temperature was selected from 900 to 1600 °C, and the increment was 5 °C (Cheng et al 2013 ; Cao et al 2008 ; Bale et al 2002 ; Luz et al 2011a , b ).…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic simulation on mineralogical composition of CaO–SiO2–Al2O3–MgO quaternary slag system

Liu

Zhang

et al. 2016

SpringerPlus

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It is necessary to elucidate the crystallization thermodynamic of mineralogical phases during the cooling process of the molten BFS with different chemical composition, because the high-melting point mineral phase maybe crystallized during the fiber forming and thereafter cooling process. Thermodynamic calculation software FactSage6.4 and the hot remelting experiments were performed to explore the influence of basicity, Al2O3 content and MgO content on the crystallization of mineralogical components and their transformation. The results showed that the main mineralography of the CaO–SiO2–Al2O3–MgO quaternary slag system was melilite, and a certain amount of anorthite and calcium metasilicate. The crystallographic temperature of melilite is increased with the increasing of basicity, MgO and Al2O3 content, which has a significant impact on the utilization performance of the mineral wool prepared with the hot blast furnace slag directly. With the increasing of basicity, there was a tendency that crystallographic amount of melilite increased to the summit and then declined, while the amount of anorthite and calcium metasilicate decreased consistently. Finally, these two mineralogical components could be replaced by magnesium rhodonite and spinel with the increasing of basicity. When the basicity and MgO content were 1.0 and 9 %, the crystallographic mass ratio of melilite and anorthite increased, while that of calcium silicate declined, and replaced by spinel finally with the increasing of Al2O3 content. When the basicity and Al2O3 content were 1.0 and 13 %, the crystallographic mass ratio of melilite increased, while that of anorthite and calcium silicate declined, and replaced by pyroxene and spinel with the increasing of MgO content. To decline fiberization temperature of the melt BFS, the basicity, MgO and Al2O3 content should be decreased during the modification process of chemical composition, because the crystallization temperature of the primary crystalline phase in the slag system without modification.

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“…Carbon, in form of graphite and/or anthracite, is charged in buckets during the melting or directly injected inside the slag for the foaming practice and the bath carburization. [ 22 ] By assuming an amount of 3–5 kg/t STEEL it implies a CO 2 emission of 11–19 kg CO2 /t STEEL . The subsequent steel bath decarburization required for achieving the chemical requirements is also responsible of 17–55 kg CO2 /t STEEL under the assumption of an initial carbon concentration of 0.5–1.5%wt.…”

Section: Introductionmentioning

confidence: 99%

Future Scenarios for Reducing Emissions and Consumption in the Italian Steelmaking Industry

Mapelli

Dall'Osto

Mombelli

et al. 2022

steel research int.

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The amount of CO2 emissions, water and electricity consumption, and soil exploitation of the main steel production routes (integrated cycle, scrap recycling, and direct reduction) are analyzed applying three possible future scenarios: use of carbon capture and storage (CCS); use of green hydrogen in substitution of natural gas; use of biomethane. Using actual process data and theoretical assumptions, the emissions and consumptions of the whole steel production cycle (from the iron ore extraction to the final steel product) are computed, taking into account also the auxiliary sources of emissions (i.e., limestone calcination and gas compression). The assessment results have highlighted the huge energy requirements and soil exploitation related to the application of green hydrogen in the steelmaking cycle, despite its low CO2 emissions. On the contrary, the use of biomethane appears more attractive if combined with carbon capture and storage systems. Overall, the results of the assessment provide a starting point for understanding the current level of sustainability of steel production and allow the identification of the most promising and plausible scenario for the steel industry of the future and the possible criticalities of each.

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Thermodynamic simulations and isothermal solubility diagrams as tools for slag foaming control

Cited by 12 publications

References 10 publications

MgO Saturation Analisys of CaO-SiO2-FeO-MgO-Al2O3 Slag System

MgO Saturation Analisys of CaO-SiO2-FeO-MgO-Al2O3 Slag System

Thermodynamic simulation on mineralogical composition of CaO–SiO2–Al2O3–MgO quaternary slag system

Future Scenarios for Reducing Emissions and Consumption in the Italian Steelmaking Industry

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