Dissolution of alumina in stainless steelmaking slags

Mantha, D.; Görnerup, Mårten; Lahiri, A.

doi:10.1002/srin.200100080

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Figure 8 shows the equilibrium relations of Al-O in a type 430 stainless steel melt for two different temperatures of 1 923 and 1 773 K at AOD tapping and tundish (T/D), respectively. If the ladle is lined with alumina, the top slag after AOD tapping would be readily saturated with Al 2 O 3 , 10) and hence the steel melt would pick up a significant amount of Al from the slag. The oxygen content in stainless steel melt at AOD tapping is controlled by Si, and the level is about 65 ppm at 1 923 K.…”

Section: Mechanism Of Inclusion Formationmentioning

confidence: 99%

A Thermodynamic Study on the Inclusion Formation in Ferritic Stainless Steel Melt

et al. 2004

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A type 430 stainless steel melt containing different Al levels was equilibrated with an AOD type slag saturated with Al 2 O 3 or MgO to clarify the formation mechanism of slag-type inclusions containing MgO · Al 2 O 3 spinel. The Al-O deoxidation equilibrium in the stainless steel melt was examined as a function of melt temperature to check the validity of available thermodynamic data, and to estimate the secondary deoxidation by Al picked up from the ladle slag. During the temperature drop from AOD to tundish, a small amount of entrapped AOD slag particles in molten steel can easily change their composition to a level where the MgO · Al 2 O 3 spinel can crystallize. The refractory material, MgO or Al 2 O 3 for a ladle, is one of critical factors to affect the Al level in the melt, and hence the formation of MgO · Al 2 O 3 spinel inclusions in the final products.KEY WORDS: stainless steel; inclusion; MgO · Al 2 O 3 spinel; secondary deoxidation; AOD slag. Fig. 1. SEM image and EDS analysis of a slag-type inclusion in stainless steel.

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Section: Mechanism Of Inclusion Formationmentioning

confidence: 99%

A Thermodynamic Study on the Inclusion Formation in Ferritic Stainless Steel Melt

et al. 2004

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Dissolution of alumina particles in CaO-Al₂O₃-SiO₂-MgO slags

Valdez¹,

Prapakorn²,

Cramb³

et al. 2002

Ironmaking & Steelmaking

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studies involved rotating rods 7 , 8 or cylinders 9 -1 1 immersed in various slags and the rate limiting steps have been found The dissolution behaviour of alumina particles in to vary depending on the system (e.g. diVusion in the liquid CaO-Al 2 O 3 -SiO 2 -MgO slags was studied by slag, 9 boundary layer diVusion, 1 1 solid state diVusion across confocal scanning laser microscopy. Three different a reaction layer 7 , 8 ). Lee and Zhang 5 reviewed various methods slag systems were investigated to evaluate the of investigating slag-refractory erosion and summarised effect of changing the MgO content in a high silica the mechanisms for slag-refractory corrosion. tundish slag, and the effect of decreasing the silica To date, relatively few studies have investigated the discontent when dissolving the particles in a ladle slag.solution of oxide inclusion particles in slags, a situation A particle of 80 mm diameter dissolved in 50 s in a characterised by much smaller volumetric ratios between simulated ladle slag but needed 100 s to dissolve in the solid and liquid phases than with solid cylinders and a high silica slag at the same temperature. When rods in slag baths. Recent studies by Zhang et al. 6 reported the silica content was decreased, a decrease in the the dissolution of fused (12 mm diameter) and tubular Al 2 O 3 alumina particle dissolution time was noted. During particles in a synthetic silicate slag. The formation of surface dissolution of alumina particles in a slag containing layers, and their morphology and thickness, was found to MgO, the alumina particle reacts with the slag to in uence the dissolution process. form an MgAlO 4 layer. No reaction layer wasThis present paper presents results on the dissolution observed during the dissolution of alumina particles kinetics of Al 2 O 3 particles in three slags obtained by direct in slags that did not contain MgO. This work observation of the dissolution process in the confocal scanning suggests that the dissolution time of large alumina laser microscope (CSLM). The slags are representative of particles is significant, increasing with particle size ladle and tundish slags. and with decreased temperature. I&S/1629At the time the work was carried out, the authors were in the Center

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Dissolution of alumina in stainless steelmaking slags

Cited by 2 publications

References 9 publications

A Thermodynamic Study on the Inclusion Formation in Ferritic Stainless Steel Melt

A Thermodynamic Study on the Inclusion Formation in Ferritic Stainless Steel Melt

Dissolution of alumina particles in CaO-Al₂O₃-SiO₂-MgO slags

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Dissolution of alumina in stainless steelmaking slags

Cited by 2 publications

References 9 publications

A Thermodynamic Study on the Inclusion Formation in Ferritic Stainless Steel Melt

A Thermodynamic Study on the Inclusion Formation in Ferritic Stainless Steel Melt

Dissolution of alumina particles in CaO-Al2O3-SiO2-MgO slags

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Dissolution of alumina particles in CaO-Al₂O₃-SiO₂-MgO slags