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Model experiments on mass transfer in ladle metallurgy
Author(s) -
Mietz Jürgen,
Schneider Stefan,
Oeters Franz
Publication year - 1991
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199101719
Subject(s) - ladle , mass transfer , nozzle , slag (welding) , residence time (fluid dynamics) , volumetric flow rate , metallurgy , water model , chemistry , steelmaking , flow (mathematics) , thermodynamics , materials science , mechanics , chromatography , engineering , physics , geotechnical engineering , computational chemistry , molecular dynamics
Model experiments on mass transfer in gas‐stirred ladles were carried out in reactors of different geometric dimensions. The model system consists of: water, cyclohexan as model slag, iodium as element to be extracted from water into slag phase, and compressed air as stirring gas. The experimental results show that when using an eccentric bottom nozzle, rate constants of mass transfer are always smaller than with centric gas injection. Centric stirring leads to comparatively larger increases of rate constants if a certain gas flow rate is exceeded. Both results can be explained by different emulsification conditions of slag phase. Theoretical calculations of residence times show that mainly the emulsification of small droplets taken along by the recirculation flow is responsible for accelerations of mass transfer in gas‐stirred ladles.