Separation and dissolution of Al2O3 inclusions at slag/metal interfaces

Lee, S.H.; Tse, Chi‐Shing; Yi, Keewook; Misra, P.; Chevrier, V. F.; Orrling, C.; Sridhar, Seetharaman; Cramb, A. W.

doi:10.1016/s0022-3093(01)00327-1

Cited by 79 publications

(72 citation statements)

References 8 publications

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“…This difference in scale could have a significant bearing on the kinetics of dissolution of a solid oxide in a slag, and casts some doubt on whether observations and data measured for macrosystems can be applied to microsystems. 16 Recently, a new technique, the high temperature laser scanning confocal microscope (LSCM), [17][18][19][20][21] has become available, which offers possibilities of analysing the dissolution behaviour of inclusions in a slag directly. Studies using the LSCM [17][18][19][20][21] have demonstrated that real time observations of the dissolution process in the bulk of a slag can be made, providing that the slag is transparent to the interrogation laser used in the instrument.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of oxide inclusion dissolution in CaO–SiO₂–Al₂O₃slag

Monaghan¹,

Chen²,

Sorbe³

2005

Ironmaking & Steelmaking

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The dissolution of alumina, spinel and zirconia inclusions in a liquid CaO-SiO 2 -Al 2 O 3 slag has been investigated using laser scanning confocal microscopy. Over the experimental temperature range 1477-1577uC it is found that alumina inclusions have a slower dissolution rate than that of spinel, and that zirconia inclusions form gas bubbles at the inclusion surface during dissolution. The results have been analysed assuming mass transfer control in the slag phase, and the slower rate of dissolution of the alumina inclusions is explained by the observation that they have a greater mass of aluminium oxide, the rate controlling species, than that of spinel.

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Section: Introductionmentioning

confidence: 99%

Comparative study of oxide inclusion dissolution in CaO–SiO₂–Al₂O₃slag

Monaghan¹,

Chen²,

Sorbe³

2005

Ironmaking & Steelmaking

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“…With confocal scanning laser microscopy (CSLM), unwetted inclusions are observed to move to each other, followed by collision and agglomeration. [13][14][15][16][17][18][19] The attractive force is considered to arise from the capillary force, which is due to the deformation of the melt surface around the inclusions. 16,20) In the bulk of liquid steel, however, studies of clustering of inclusions are still limited from the viewpoint of interfacial properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alumina Morphology on the Clustering of Alumina Inclusions in Molten Iron

et al. 2016

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Clustering of alumina inclusions during liquid processing of steel significantly influences its cleanliness and mechanical properties. We have therefore studied the effect of alumina inclusion morphology on their clustering behavior in molten iron. Alumina inclusions were extracted from iron samples taken at 1 min after Al addition. Dendritic, spherical, plate-like, faceted and clustered alumina inclusions were identified and their clustering degrees were measured. The clustering degree increases in the order of spherical, dendritic, plate-like and faceted inclusions. To explain this, attractive force between two alumina particles with different shape combinations, i.e., sphere-sphere (S-S), sphere-plane (S-P), plane-plane (P-P), was calculated based on the theory of spontaneous cavitation. The attractive force is influenced significantly by particle shape. S-S type has the smallest attractive force and the shortest acting length. P-P type has the largest attractive force and the longest acting length. This explains that spherical inclusions have the lowest clustering degree. The lower clustering degree of plate-like inclusions, compared with faceted inclusions, is due to that molten iron wets plate-like inclusions better.

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“…Research currently available focuses primarily on laboratory testing. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] As such, the applicability of this resource is not optimized in the manufacture of steel, reducing its potential cleanliness.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Inclusion Absorption by Slags during Secondary Refining of Steel

2014

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One of the functions of secondary refining in steelmaking is to remove non-metallic inclusions produced through deoxidation of the steel bath during the process. Removal of these inclusions occurs in three fundamental stages: flotation, separation and dissolution of the inclusions in supernatant slag. Given that dissolution is subject to the action of slag, this study aims to clarify the inclusion absorption capacity of industrial slags and factors that influence slag properties in absorbing inclusions, as well as the impact of each factor on the cleanliness of the steels analyzed. To that end, the results of industrial steel and slag samples collected during the different stages of secondary refining were analyzed. The amount and chemical composition of the inclusions was determined by SEM/EDS (scanning electron microscopy coupled with energy-dispersive spectroscopy). The chemical composition of slag samples was measured by XRF (X-ray fluorescence) and subsequently submitted to thermodynamic simulations using FactSage 6.4 software. Calculations were made with the SlagViscosityPredictor, which uses FactSage 6.2 software. This made it possible to establish the chemical composition and proportion of the solid phase in the slags and inclusions, as well as the effective viscosity of the slags. The efficiency of absorption inclusion by the industrial slags was found to be greater in the presence of high thermodynamic driving force between slags and inclusions, low slag effective viscosity and when inclusions were not liquid.

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Separation and dissolution of Al2O3 inclusions at slag/metal interfaces

Cited by 79 publications

References 8 publications

Comparative study of oxide inclusion dissolution in CaO–SiO₂–Al₂O₃slag

Comparative study of oxide inclusion dissolution in CaO–SiO₂–Al₂O₃slag

Effect of Alumina Morphology on the Clustering of Alumina Inclusions in Molten Iron

Efficiency of Inclusion Absorption by Slags during Secondary Refining of Steel

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Separation and dissolution of Al2O3 inclusions at slag/metal interfaces

Cited by 79 publications

References 8 publications

Comparative study of oxide inclusion dissolution in CaO–SiO2–Al2O3slag

Comparative study of oxide inclusion dissolution in CaO–SiO2–Al2O3slag

Effect of Alumina Morphology on the Clustering of Alumina Inclusions in Molten Iron

Efficiency of Inclusion Absorption by Slags during Secondary Refining of Steel

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Comparative study of oxide inclusion dissolution in CaO–SiO₂–Al₂O₃slag

Comparative study of oxide inclusion dissolution in CaO–SiO₂–Al₂O₃slag