Kinetics of Al2O3 dissolution in CaO-MgO-SiO2-Al2O3 slags: In Situ observations and analysis

Sridhar, Srikanth; Cramb, A. W.

doi:10.1007/s11663-000-0059-2

Cited by 115 publications

(106 citation statements)

References 5 publications

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“…A Confocal Scanning Laser Microscope (CSLM) equipped with a gold image furnace 2) attached to video photography equipment was used for the direct observation of the dissolution process. In the past few years this has become a well accepted technique for studying inclusion behaviour, 2,9,12,13) capturing dissolution times and rates.…”

Section: Confocal Scanning Laser Microscopementioning

confidence: 99%

“…In the past few years this has become a well accepted technique for studying inclusion behaviour, 2,9,12,13) capturing dissolution times and rates. A full description of the technique and the microscope has been described previously [9][10][11] with only the key details listed here.…”

Section: Confocal Scanning Laser Microscopementioning

confidence: 99%

“…The processes whereby inclusions are removed during liquid steel refining include: (i) transportation of the inclusion to the interface, (ii) separation of the inclusion at the interface, (iii) removal of the inclusion from the interface to the liquid slag and (iv) dissolution of the inclusion in the liquid slag. 1,2) Smaller inclusions may rest near to the interface and thereby cause steric hindrance to continued separation as well as risking inclusion re-entrainment back into the metal. 2) In order to keep the number of such inclusions small, it is best if they dissolve rapidly in the slag.…”

Section: Introductionmentioning

confidence: 99%

“…1,2) Smaller inclusions may rest near to the interface and thereby cause steric hindrance to continued separation as well as risking inclusion re-entrainment back into the metal. 2) In order to keep the number of such inclusions small, it is best if they dissolve rapidly in the slag.…”

Section: Introductionmentioning

confidence: 99%

“…To ensure lubrication of the mould/strand gap, a relatively low viscosity needs to be maintained and has traditionally been achieved by fluoride and Na 2 7,8) or inclusion re-entrainment.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dissolution of ZrO2, Al2O3, MgO and MgAl2O4 Particles in a B2O3 Containing Commercial Fluoride-free Mould Slag

et al. 2004

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Non-metallic inclusions composed of ZrO 2 , Al 2 O 3 , MgO and MgAl 2 O 4 are associated with problems during the continuous casting of steels and so it is desirable that such particles dissolve completely if they appear in the slag. The dissolution behaviour of particles of these oxides in a fluorine-free slag containing 1.5 wt% B 2 O 3 , was studied in situ using Confocal Scanning Laser Microscopy (CSLM). The effects of particle type, initial size, and slag temperature were investigated. Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDS) was performed to chemically analyze quenched samples, in order to identify any surface reaction or diffusion layers formed. Analytical prediction models were compared to the experimental data to relate the kinetics to possible rate-limiting steps. Thermodynamic solubility limits for use in the model were determined using commercial CALPHAD based software. The dissolution rates of Al 2 O 3 , MgO and MgAl 2 O 4 were found to be comparable to one another whereas the dissolution rate of ZrO 2 , is four times slower. The surface reaction appears to be controlling the rate of dissolution, with the activation energy for ZrO 2 being 128.8 kJ/mol and for MgAl 2 O 4 being 77.8 kJ/mol. This implies that the removal of ZrO 2 particles by dissolution in this type of slag is not feasible for the typical residence times expected, and strategies that prevent the incorporation of these particles should be used.

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Section: Confocal Scanning Laser Microscopementioning

confidence: 99%

Section: Confocal Scanning Laser Microscopementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…To ensure lubrication of the mould/strand gap, a relatively low viscosity needs to be maintained and has traditionally been achieved by fluoride and Na 2 7,8) or inclusion re-entrainment.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dissolution of ZrO2, Al2O3, MgO and MgAl2O4 Particles in a B2O3 Containing Commercial Fluoride-free Mould Slag

et al. 2004

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Precipitation Behavior of Titanium Bearing Blast Furnace Slag

et al. 2016

Advances in Molten Slags, Fluxes, and Salts

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Diffusion‐limited dissolution of spherical particles: A critical evaluation and applications of approximate solutions

et al. 2017

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The analytical and numerical description of the effective dissolution kinetics of spherical particles into a solvent is often difficult in chemical and metallurgical engineering. The crucial first step is to identify the dissolution mechanisms, and subsequently, relevant kinetics parameters can be calculated. In this article, three frequently used approximations, i.e., the invariant‐field (IF) (Laplace), reverse‐growth (RG), and invariant‐size (IS) (stationary‐interface) approximations, are systematically discussed and compared with numerical simulation results. The relative errors of the dissolution curves and total dissolution time of the three approximations to the numerical simulations are calculated. The results reveal the appropriate application ranges of the approximations for given precision levels. With further experimental validation, this research provides a methodology to properly assess dissolution kinetics and adequately estimate effective diffusion coefficients and activation energy under the experimental uncertainties. © 2017 American Institute of Chemical Engineers AIChE J, 63: 2926–2934, 2017

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Kinetics of Al2O3 dissolution in CaO-MgO-SiO2-Al2O3 slags: In Situ observations and analysis

Abstract: transfer in the liquid, then the increased crystal growth rate Ishii: Iron Steel Inst.

Cited by 115 publications

References 5 publications

Dissolution of ZrO2, Al2O3, MgO and MgAl2O4 Particles in a B2O3 Containing Commercial Fluoride-free Mould Slag

Dissolution of ZrO2, Al2O3, MgO and MgAl2O4 Particles in a B2O3 Containing Commercial Fluoride-free Mould Slag

Precipitation Behavior of Titanium Bearing Blast Furnace Slag

Diffusion‐limited dissolution of spherical particles: A critical evaluation and applications of approximate solutions

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