In Situ Observation of Calcium Aluminate Inclusions Dissolution into Steelmaking Slag

Miao, Keyan; Haas, Alyssa; Sharma, Mukesh; Mu, Wangzhong; Dogan, Neslihan

doi:10.1007/s11663-018-1303-y

Cited by 42 publications

(41 citation statements)

References 45 publications

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“…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: Methodsmentioning

confidence: 99%

“…The particle‐slag system was placed inside the furnace. The schematic diagram of the experimental setup inside the heating chamber is illustrated in Figure . A single TiO 2 or Al 2 TiO 5 particle was placed on the surface of the pre‐molten slag in a platinum crucible.…”

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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“…More detailed analysis of this model can be found elsewhere . The modified invariant interface approximation has been applied to describe silica dissolution in CaO–Al 2 O 3 –SiO 2 slag, alumina dissolution in CaO–Al 2 O 3 –MgO–SiO 2 slag …”

Section: Prediction Of Total Dissolution Time For Alumina Inclusion Imentioning

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%

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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“…One of its vital application refers to the steel cleanliness control, which is significantly influenced by the detachment behavior of non-metallic inclusion particles, referred as "inclusion" from herein. 15 More recently, a new technique, hightemperature confocal laser scanning microscope, referred as HT-CLSM hereafter, 10,11,[15][16][17][18][19] has become available to offer an in situ observation of microparticles in slag directly. Various experiments and simulation work [1][2][3][4][5][6][7][8][9] have been performed regarding the first two processes.…”

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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In Situ Observation of Calcium Aluminate Inclusions Dissolution into Steelmaking Slag

Cited by 42 publications

References 45 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

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

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In Situ Observation of Calcium Aluminate Inclusions Dissolution into Steelmaking Slag

Cited by 42 publications

References 45 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

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

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