Effect of FeO and Al2O3 on the MgO Solubility in CaO–SiO2–FeO–Al2O3–MgO Slag System at 1823 K

Kim, Young Jae; Min, Dong Joon

doi:10.1002/srin.201200025

Cited by 19 publications

(8 citation statements)

References 28 publications

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“…Table 2 shows that the higher the Al 2 O 3 content, the greater the basicity (from 2.15 at 0% to 2.78 at 8% Al 2 O 3 ) and lower the FeO content needed for dual saturation. This indicates the flux effect of alumina, as demonstrated by Kim et al 26 .…”

Section: Effect Of Alsupporting

confidence: 67%

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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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Section: Effect Of Alsupporting

confidence: 67%

“…It is known that higher binary basicity slags, require lower MgO content for saturation 16 and that the FeO content significantly influences MgO saturation 26 . This can be seen in figure 2, which shows MgO saturation levels for different FeO contents for binary basicities ranging from 1.5 to 3.0.…”

Section: Effects Of Binary Basicity and Feo Contentmentioning

confidence: 99%

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

et al. 2017

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“…Thus, as the recovery of metal increases from the slag, the thermophysical properties of the slag could change and affect the process parameters. According to Kim and Min,69 as the FeO is substituted with Al 2 O 3 in the CaO-SiO 2 -FeO-Al 2 O 3 -MgO EAF slag system at 1823 K and fixed basicity of unity, the MgO solubility for the slag system increases, but beyond a certain X Al 2 O 3 X Al 2 O 3 þ X FeO À Á , the primary structure of the slag changes from a magnesio-wustite to a spinel structure. This change in structure could increase the breakpoint of the slag and thus significantly decrease the fluidity of the slag making operations difficult.…”

Section: Improvements In Slag Compositional Control and Lower Feomentioning

confidence: 99%

Review of Innovative Energy Savings Technology for the Electric Arc Furnace

Lee

Sohn

2014

JOM

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A review of the energy innovations for the electric arc furnace (EAF) steelmaking route is discussed. Preheating of scrap using vertical and horizontal shafts that have been commercially successful in lowering the energy consumption to as much as 90 kWh/t reaching almost the operational limit to heating input scrap materials into the EAF is discussed. Bucket-type and twin-shell preheaters have also shown to be effective in lowering the overall power consumption by 60 kWh/t, but these have been less effective than the vertical shaft-type preheaters. Beyond the scrap preheating technologies, the utilization of waste heat of the slags from the laboratory scale to the pilot scale has shown possible implementation of a granulation and subsequent heat exchange with forced air for energy recovery from the hot slags. Novel techniques to increase metal recovery have shown that laboratory-scale testing of localized Fe concentration into the primary spinel crystals was possible allowing the separation of an Fe-rich crystal from an Fe-depleted amorphous phase. A possible future process for converting the thermal energy of the CO/ CO 2 off-gases from the EAF into chemical energy was introduced.

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“…In order to investigate the effect of time on MgO solubility, the MgO solubility of the 32.8MgF2-67.2LiF system was measured while varying the experimental time. As shown in Figure 3, equilibrium can be achieved in the MgO and 32.8MgF2-67.2LiF system in less than 2 h. In addition, equilibrium was achieved in the 46.5MgF2-46.5CaF2-7LiF system [22] in less than 3 h at temperatures lower than 1273 K. Ito and Morita [27], who studied MgO solubility in the molten MgCl2 and CaCl2 systems, also reported an equilibrium time of less than 2 h. Considering that equilibrium between solid MgO and oxide systems takes more than 8 h [28], the equilibrium time of 2 h for molten fluoride obtained in this study is significantly short. The effects of temperature on MgO solubility in the molten fluoride system can be seen in Figure 4.…”

Section: Determination Of the Saturated Mgo Concentration In Molten Fmentioning

confidence: 94%

Applicability of the Electrochemical Oxygen Sensor for In-Situ Evaluation of MgO Solubility in the MgF2–LiF Molten Salt Electrolysis System

Kim

Yoo

Kang

2020

Metals

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The measurement and evaluation of MgO solubility in the molten fluoride system is of significant importance in the recently proposed magnesium electrolysis reduction process. In the present study, an in-situ quantitative method of evaluating the concentration of dissolved MgO in molten fluoride is proposed. The MgO solubility in the 32.8MgF2–67.2LiF system was measured at 1083 and 1123 K using a combustion analyzer. MgO saturation was achieved in under 2 h, and higher solubilities were observed as the temperature increased. Thermodynamic assessment was carried out in order to ascertain the applicability of the electrochemical oxygen sensor, which indicated that the logarithm of oxygen concentration in molten fluoride has a linear relationship with the measured electromotive force (EMF) potential. The EMF potential of the controlled MgO concentration was measured, and a straight calibration line was obtained, describing the relationship between the measured EMF and the logarithm of MgO concentration. From the obtained calibration line, MgO concentration in the 0.4 wt% MgO was calculated. The calculated value was 0.44 wt% that was in excellent accordance with the controlled MgO concentration of 0.4 wt%, verifying the practical applicability of electrochemical oxygen for the in-situ monitoring and evaluation of MgO solubility in the electrolysis magnesium reduction process.

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Effect of FeO and Al₂O₃ on the MgO Solubility in CaO–SiO₂–FeO–Al₂O₃–MgO Slag System at 1823 K

Cited by 19 publications

References 28 publications

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

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

Review of Innovative Energy Savings Technology for the Electric Arc Furnace

Applicability of the Electrochemical Oxygen Sensor for In-Situ Evaluation of MgO Solubility in the MgF2–LiF Molten Salt Electrolysis System

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