Study on Oxide Inclusion Dissolution in Secondary Steelmaking Slags using High Temperature Confocal Scanning Laser Microscopy

Michelic, Susanne Katharina; Goriupp, Jürgen; Feichtinger, Stefan; Kang, Youn‐Bae; Bernhard, Christian; Schenk, Johannes

doi:10.1002/srin.201500102

Cited by 56 publications

(43 citation statements)

References 38 publications

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“…The shrinking core model and the diffusion into a stagnant fluid model have both been applied to determine the dissolution mechanism of inclusions in steelmaking slags . Their development and applications can be found elsewhere .…”

Section: Resultsmentioning

confidence: 99%

“…Steelmaking slags mainly contain CaO, Al 2 O 3 , SiO 2 , MgO, FeO, MnO, and CaF 2 . Because the CSLM technique precludes using slags containing transition oxides such as FeO and CrO x , slag composition usually consists of CaO, SiO 2 , Al 2 O 3 , and MgO . In this work, slag composition is 20.0 ± 0.7 wt% Al 2 O 3 , 40.0 ± 0.4 wt% CaO, and 40.0 ± 0.5 wt% SiO 2 .…”

Section: Methodsmentioning

confidence: 99%

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Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Sharma

Dąbkowska

Dogan

2018

steel research int.

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The dissolution kinetics of micro‐particles (inclusions) in steelmaking slags is investigated using the high temperature confocal scanning laser microscope (HT ‐ CSLM). However, these studies focus on the limited type of inclusions such as Al2O3, SiO2, MgO, CaO, and MgAl2O4. To experimentally study the removability of various problematic inclusions that are not available in the market, optical floating zone and sintering techniques are presented here for the production of high purity micro‐particles. The syntheses of TiO2 and Al2TiO5 inclusions are employed to demonstrate the advantages and potential of both techniques. These inclusions are then dissolved in the steelmaking slags using CSLM at 1430 °C. In situ observation shows that there is gas evolution during the reaction between slag and Al2TiO5 particles prepared by both techniques. However, the gas evolution is more rapid during the dissolution of particles prepared by sintering and hinders in situ observations and measurements. The optical floating zone technique is capable of preparation of micro‐particles with high purity and less porosity. At 1430 °C, the Al2TiO5 particles do not dissolve at all, whereas TiO2 particles completely dissolve in 200 s.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Sharma

Dąbkowska

Dogan

2018

steel research int.

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“…In the previous investigations on ceramic particle dissolution in molten slags using CSLM, the obtained experimental data (particle radius r ( t ) at time t ) were often analyzed using the Shrinking Core Model (SCM) . Among a number of possible modes in the SCM, two modes were frequently considered:

\frac{r (t)}{r_{0}} = 1 - \frac{t}{t_{tot}}

where a chemical reaction at the interface between the particle and the slag controls the dissolution rate, or

\frac{r (t)}{r_{0}} = \sqrt{1 - \frac{t}{t_{tot}}}

where mass transport (diffusion) of the dissolving species in a thin boundary layer controls the dissolution rate.…”

Section: Prediction Of Total Dissolution Time For Alumina Inclusion Imentioning

confidence: 99%

“…Many previous investigations were carried out to determine the dissolution kinetics/mechanism of alumina in various slag systems . These investigations are summarized in Table .…”

Section: Introductionmentioning

confidence: 99%

“…The size of the alumina sample used in the dissolution experiment was also small (typically in a few hundred micrometers), which is not very different from actual inclusions found in liquid steel shortly after deoxidation. Therefore, the CSLM technique has been widely used to measure the dissolution kinetics of not only alumina 11,13,[15][16][17][18]21,23,25 but also magnesia, 16,17,21,22 spinel, 17 silica, 26 calcium aluminate, 27 SiC, 28 etc. This technique was first applied to the dissolution of alumina inclusion by Sridhar and Cramb, 11 a small crucible containing a slag is heated in a gold-coated image furnace by a halogen lamp.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution kinetics of alumina in molten CaO–Al₂O₃–Fe_tO–MgO–SiO₂ oxide representing the RH slag in steelmaking process

et al. 2019

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In order to effectively remove alumina inclusions suspending in ultra‐low C steel during RH process, the dissolution kinetics of alumina in molten CaO–Al2O3–FetO–MgO–SiO2 oxide was investigated. A crucible dissolution technique was used where the alumina crucible was allowed to dissolve in the slag of various conditions ((% CaO)/(% Al2O3), (% FetO), temperature). The obtained data were interpreted using a kinetic mass transport equation to obtain the mass transport coefficient (km) in each condition. Increasing (% CaO)/(% Al2O3), (% FetO), and temperature increased the dissolution rate as well as the km provided that the slag composition is not close to its saturation composition by alumina. In order to simulate the dissolution of alumina inclusion in the RH slag, which cannot be measured by a confocal scanning laser microscopy (CSLM) at present due to the opaqueness of the slag, the modified invariant interface approximation was employed. Along with the obtained km, the viscosity of slag, and a reference experiment using the CSLM, the dissolution kinetics of alumina inclusion in the FetO‐containing RH slag was predicted. The time required for the dissolution of alumina inclusions from liquid steel to RH slag was discussed.

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Effect of Magnesium Addition on Behavior of Collision and Agglomeration between Solid Inclusion Particles on H13 Steel Melts

Wang

et al. 2016

steel research int.

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on H13 molten steel surfaces is observed in situ through a confocal scanning laser microscope (CSLM) equipped with a gold image furnace, and the attractive force between these solid inclusions is calculated by using Newton's second law. Results and analysis show that the attractive force between alumina particles in H13 steel without magnesium is stronger than that between MgO Á Al 2 O 3 particles in H13 steel containing magnesium, and the action radius of attractive force between alumina particles is larger than that between MgO Á Al 2 O 3 particles. MgO Á Al 2 O 3 particles have a much weaker tendency to collide, agglomerate, grow, and form clusters than alumina particles in H13 steel. Therefore, the collision, agglomeration and growth of inclusions, as well as the formation of clusters in H13 steel can be effectively impeded by the adding of magnesium.

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Study on Oxide Inclusion Dissolution in Secondary Steelmaking Slags using High Temperature Confocal Scanning Laser Microscopy

Cited by 56 publications

References 38 publications

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Dissolution kinetics of alumina in molten CaO–Al₂O₃–Fe_tO–MgO–SiO₂ oxide representing the RH slag in steelmaking process

Effect of Magnesium Addition on Behavior of Collision and Agglomeration between Solid Inclusion Particles on H13 Steel Melts

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Study on Oxide Inclusion Dissolution in Secondary Steelmaking Slags using High Temperature Confocal Scanning Laser Microscopy

Cited by 56 publications

References 38 publications

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Dissolution kinetics of alumina in molten CaO–Al2O3–FetO–MgO–SiO2 oxide representing the RH slag in steelmaking process

Effect of Magnesium Addition on Behavior of Collision and Agglomeration between Solid Inclusion Particles on H13 Steel Melts

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Dissolution kinetics of alumina in molten CaO–Al₂O₃–Fe_tO–MgO–SiO₂ oxide representing the RH slag in steelmaking process