MOLTEN STEEL DENITRIFICATION METHOD, SIMULTANEOUS DENITRIFICATION AND DESULFURIZATION TREATMENT METHOD, AND STEEL PRODUCTION METHOD
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United States of America Patent
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Issued Date -
Aug 8, 2024
app pub date -
May 12, 2022
filing date -
Jun 11, 2021
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A method wherein a denitrification treatment allows an extremely low nitrogen concentration range to be stably and quickly reached, so denitrification and/or desulfurization of molten steel can be efficiently performed. Wherein CaO-and-Al2O3-containing slag is formed on top of molten steel charged in a vessel and an oxygen-containing gas is blown from above, while the slag and the molten steel are brought into contact with each other to remove nitrogen in the molten steel. An Al concentration in the steel is kept at or higher than a value determined by Formula (1) according to a stirring power density, and the gas is blown so a ratio between a thickness Ls0 of the slag and a depth Ls of a depression in the slag resulting from blowing of the gas meets Ls/Ls0≥1:
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