Physical Modelling of Gas Injection in a Ladle
Palovaara, Tuomas; Visuri, Ville-Valtteri; Fabritius, Timo
Associazione Italiana di Metallurgia
Palovaara, T., Visuri, V-V. & Fabritius, T. (2018). Physical Modelling of Gas Injection in a Ladle. Paper presented at the 7th International Congress on Science and Technology of Steelmaking held in Venice Mestre, Italy, from 13 to 15 June 2018. Associazione Italiana di Metallurgia.
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© The Authors & Associazione Italiana di Metallurgia
https://rightsstatements.org/vocab/InC/1.0/
© The Authors & Associazione Italiana di Metallurgia
https://rightsstatements.org/vocab/InC/1.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202506124358
https://urn.fi/URN:NBN:fi:oulu-202506124358
Tiivistelmä
Abstract
Ladle metallurgy serves to make final adjustments to the composition and temperature of the metal bath before casting. The aim of this work was to study the effect of bottom-blowing on the mixing, formation of the open eye, and emulsification of slag during ladle treatments. For this purpose, a 1:5 scale physical model of a 150 t ladle was employed. Kinematic similarity was ensured by maintaining Froude similarity in the gas plume, while air, water, and rapeseed oil were used to represent argon, molten metal, and slag, respectively. The results indicate that increasing the gas flow rate reduced the average mixing time and increased the size of the open eye non-linearly. A new method to specify the size distribution of emulsified oil droplets was tested and it was found that the size distribution of oil droplets could be described well with a normal logarithmic distribution function. The measured evolution of the centreline velocity of the liquid phase suggests that the fluid flow behaviour is dominated by buoyancy forces.
Ladle metallurgy serves to make final adjustments to the composition and temperature of the metal bath before casting. The aim of this work was to study the effect of bottom-blowing on the mixing, formation of the open eye, and emulsification of slag during ladle treatments. For this purpose, a 1:5 scale physical model of a 150 t ladle was employed. Kinematic similarity was ensured by maintaining Froude similarity in the gas plume, while air, water, and rapeseed oil were used to represent argon, molten metal, and slag, respectively. The results indicate that increasing the gas flow rate reduced the average mixing time and increased the size of the open eye non-linearly. A new method to specify the size distribution of emulsified oil droplets was tested and it was found that the size distribution of oil droplets could be described well with a normal logarithmic distribution function. The measured evolution of the centreline velocity of the liquid phase suggests that the fluid flow behaviour is dominated by buoyancy forces.
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