TOP-BLOWING LANCE FOR CONVERTER, METHOD FOR ADDING AUXILIARY RAW MATERIAL, AND METHOD FOR REFINING OF MOLTEN IRON
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United States of America Patent
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Issued Date -
Mar 7, 2024
app pub date -
Dec 2, 2021
filing date -
Feb 1, 2021
priority date (Note) -
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Abstract
A method that, regarding a process of refining molten iron, can increase the thermal margin and the amount of cold iron source to be used. A burner having jetting holes for jetting a fuel and a combustion supporting gas is provided at a leading end part of one lance that top-blows an oxidizing gas to molten iron contained in a converter-type vessel, or at a leading end part of another separate lance. A powdery auxiliary raw material or an auxiliary raw material processed into a powder form that is blown into the molten iron from the one lance or the other lance passes through a flame formed by the burner. This top-blowing lance for a converter is configured to secure a predetermined heating time and powder-fuel ratio. Also, a method for adding an auxiliary raw material and a method for refining of molten iron that use this top-blowing lance.
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