Dissolution Behavior of Alumina-Based Inclusions in CaF2-Al2O3-CaO-MgO-SiO2 Slag Used for the Electroslag Metallurgy Process

Dong, Yanwu; Yu, Ang

doi:10.3390/met6110273

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…These studies showed that the reaction temperature and slag composition were the dominant factors influencing the dissolution speed of inclusions, while the size and surface roughness of the oxide material could have negative effects on the experimental results. 18,19 Another experimental method for studying inclusion dissolution is applying a high-temperature confocal microscope to observe the dissolution process belonging to a single spherical ball. The dissolution models of an inclusion ball in slag are usually established based on the unreacted shrinking core model.…”

Section: Introductionmentioning

confidence: 99%

“…In these experiments, a solid oxide bar was usually immersed in molten slag and rotated at different speeds, and then the dissolution speed of inclusions in the molten slag was analyzed by comparing the change in the size of the bar before and after the rotating process. These studies showed that the reaction temperature and slag composition were the dominant factors influencing the dissolution speed of inclusions, while the size and surface roughness of the oxide material could have negative effects on the experimental results 18,19 …”

Section: Introductionmentioning

confidence: 99%

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Dissolution mechanism of alumina inclusions into CaO–SiO ₂ –Al ₂ O ₃ –Fe _t O–MgO slag via a converter tapping process

Song

Yan

2022

Int J Applied Ceramic Tech

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Reducing the amount of inclusions during the steelmaking process as much as possible and much earlier plays a vital role in improving the quality of steel products. To reveal the dissolution mechanism of inclusions in slag during the converter tapping process, some comparison experiments were conducted by adding isolated spherical alumina balls as inclusions in CaO–SiO2–Al2O3–FetO–MgO slag, and FetO content up to 10% was contained in slag. The results showed that the dissolution rate of alumina balls in the slag was mainly affected by the diffusion of Al2O3, and the diffusion coefficients of Al2O3 were 4.2 × 10–11, 7.5 × 10–11, and 1.5 × 10–10 m2/s at 1500℃, 1550℃, and 1600℃, respectively. In addition, the upgraded diffusion‐distance‐controlled dissolution model (DDD‐Model), in which FetO content was introduced and applied in the study. The results illustrated that the Al2O3 inclusion apparent dissolution rate was improved by a high FetO content, increasing CaO/SiO2 and raising the temperature as soon as possible at the early stage of the converter tapping process. It is not necessary to increase the FetO content in the slag to enhance the dissolution rate of the Al2O3 inclusion at the last tapping stage. The predicted complete dissolution time of spherical Al2O3 inclusions with 1000 µm in diameter based on the upgraded DDD‐Model was approximately 1796 s during the actual converter tapping process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dissolution mechanism of alumina inclusions into CaO–SiO ₂ –Al ₂ O ₃ –Fe _t O–MgO slag via a converter tapping process

Song

Yan

2022

Int J Applied Ceramic Tech

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“…Chou et al [15] investigated the dissolution of Al 2 O 3 inclusions in the CaO-Al 2 O 3 -CaF 2 system using the rotating cylinder method. Dong et al [16] investigated the dissolution of Al 2 O 3 inclusions in CaF 2 -Al 2 O 3 -CaO-MgO-SiO 2 ESR slag using optical microscopy (OM) and scanning electron microscopy (SEM) analysis of quenched slag. Sridhar's research did not find the formation of intermediate compounds at the alumina/slag interface and found that the dissolution process of alumina is controlled by diffusion [14].…”

Section: Introductionmentioning

confidence: 99%

Dissolution Behavior of Al2O3 Inclusions in CaO-Al2O3 Based Slag Representing Aluminothermic Reduction Slag

Guanyong

Zhang

et al. 2020

Crystals

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In the preparation of CuCr alloy using the self-propagating high-temperature synthesis (SHS)-metallurgy method, the dissolution of alumina in molten slag has an important influence in two key steps: aluminum thermal reduction and slag refining. In the present work, the dissolution behavior of Al2O3 into molten SHS-metallurgical slags was investigated by employing the rotating cylinder method and static dissolution method. It is concluded that the increase of MgO, CaF2, CaO, and Na3AlF6 contents can increase the dissolution rate of alumina in SHS-metallurgical slag, and the order of influence is from strong to weak. Both temperature and rotating speed can increase the dissolution rate, and the rate-limiting step is the diffusion of alumina in the boundary layer, with the solid alumina first reacting with lime to form two intermediate phases, CaO·2Al2O3 and CaO·6Al2O3, and finally dissolving into the slag in the form of an aluminum polymer.

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“…Inclusions are similarly removed through the tundish or using mold flux during casting process, where a quick inclusion dissolution also prevents the early crystallization within the slag that might result in the sticker breakouts. 10,11 Particle dissolution phenomenon in the slags has been traditionally studied using dip-test technique, [12][13][14] whereby a macro oxide bulk material is immersed into a molten slag for a period of time. The dipped oxide material can be static or rotated in the molten slag.…”

Section: Introductionmentioning

confidence: 99%

A phase‐field model for the study of isothermal dissolution behavior of alumina particles into molten silicates

Xuan¹,

2019

J Am Ceram Soc

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Particle dissolution process refers to the dissolving of one liquid or solid phase into another solvent phase. This process is of vital importance in the engineering material science, and chemical engineering, etc. Here, we develop a phase‐field model with diffusion‐controlled processes at interfaces for isothermal dissolution of alumina inclusion particles in molten silicates, referred as “slag,” with comprehensive compositions applied in process metallurgy. The interfacial energy between solid inclusion particle and molten silicate can vary with different temperatures and chemical compositions. This model is validated using experimental data of high‐temperature confocal laser scanning microscopy (HT‐CLSM) technique. Moreover, the developed model is applicable to predict the dissolution behavior of solid particle in a realistic size scale. The possibility of the model application is illustrated with studies of different physical parameters that affect particle dissolution behavior. The phase‐field simulations show that inclusion morphology influences both the dissolution profile and time, and the influence decreases with the increased temperature. Increasing same amount of Al2O3 component in slag, the increased degrees of the alumina dissolution time in silicates with different V‐ratio values, a ratio between the mass percent of CaO and that of SiO2, are almost the same. If the V‐ratio of slag is relatively small, an increased MgO component in the silicate will significantly decrease the particle dissolution time. On the contrary, the change in MgO component in the silicate will have a minor effect if the value of V‐ratio is quite large. In order to rapidly dissolve the inclusion, basicity index (BI) of molten silicate should be larger than 1.4. A balance between BI and MgO component in slag is suggested to be considered to design or optimize molten silicate (slag) for its application in the refining process of steel manufacturing.

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Dissolution Behavior of Alumina-Based Inclusions in CaF2-Al2O3-CaO-MgO-SiO2 Slag Used for the Electroslag Metallurgy Process

Cited by 10 publications

References 18 publications

Dissolution mechanism of alumina inclusions into CaO–SiO ₂ –Al ₂ O ₃ –Fe _t O–MgO slag via a converter tapping process

Dissolution mechanism of alumina inclusions into CaO–SiO ₂ –Al ₂ O ₃ –Fe _t O–MgO slag via a converter tapping process

Dissolution Behavior of Al2O3 Inclusions in CaO-Al2O3 Based Slag Representing Aluminothermic Reduction Slag

A phase‐field model for the study of isothermal dissolution behavior of alumina particles into molten silicates

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Dissolution Behavior of Alumina-Based Inclusions in CaF2-Al2O3-CaO-MgO-SiO2 Slag Used for the Electroslag Metallurgy Process

Cited by 10 publications

References 18 publications

Dissolution mechanism of alumina inclusions into CaO–SiO 2 –Al 2 O 3 –Fe t O–MgO slag via a converter tapping process

Dissolution mechanism of alumina inclusions into CaO–SiO 2 –Al 2 O 3 –Fe t O–MgO slag via a converter tapping process

Dissolution Behavior of Al2O3 Inclusions in CaO-Al2O3 Based Slag Representing Aluminothermic Reduction Slag

A phase‐field model for the study of isothermal dissolution behavior of alumina particles into molten silicates

Contact Info

Product

Resources

About

Dissolution mechanism of alumina inclusions into CaO–SiO ₂ –Al ₂ O ₃ –Fe _t O–MgO slag via a converter tapping process

Dissolution mechanism of alumina inclusions into CaO–SiO ₂ –Al ₂ O ₃ –Fe _t O–MgO slag via a converter tapping process