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Change of Nitrogen Content in the Molten Steel during CaO Powder Blowing
Author(s) -
Numata Mitsuhiro,
Higuchi Yoshihiko,
Fukagawa Shin
Publication year - 2003
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200300157
Subject(s) - crucible (geodemography) , desorption , nitrogen , metallurgy , nitrogen gas , materials science , chemistry , die (integrated circuit) , analytical chemistry (journal) , chromatography , adsorption , organic chemistry , computational chemistry , nanotechnology
The rates of nitrogen desorption from molten steel were measured with the blow of CaO powder or argon gas onto the melts under reduced pressure. 15kg of electrolytic iron was melted in a MgO crucible by a high frequency induction furnace and the temperature of the melt was held at 1873 K. A mathematical model was developed with the consideration of the chemical reaction between sulphur in molten steel and CaO powder and the desorption of nitrogen at gas‐metal interface. The calculated results were in good agreement with the measured ones. The apparent rate constant of nitrogen desorption and the rate controlling step were examined.