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Patent Searching and Data


Title:
CONVERTER PROCESS RECYCLING DECARBURIZED SLAG
Document Type and Number:
Japanese Patent JP3333339
Kind Code:
B2
Abstract:

PURPOSE: To suppress sudden boiling of molten iron at next charge by scattering/solidifying while blowing top blowing gas to remaining slag under specific condition after the molten steel produced through dephosphorizing/decarburizing of molten iron in a converter is tapped.
CONSTITUTION: A molten iron 4 is poured into a converter 1 without discharging the slag 6 produced at the preceding charge, an oxygen 7 is supplied from a top lance 2 at about 1200-1450°C, and the slag produced through dephosphorization refining is discharged. Successively, after decarburizing is executed with supplying an oxygen 7 from the top blowing lance 2, a molten steel produced is tapped. Further, in such a state that a slag 6 remains in furnace, a gas 8 of one or more kinds of N, Ar, etc., is blown at a flow rate of 80-250Nm3/Hr.ton so that the ratio (Ls/Lso) between a dent depth (Ls) formed to the slag due to top blown gas and slag thickness (Lso) is turned to 2-15. By this method, scattering of the slag 6 to furnace wall and erosion of furnace bottom refractory is efficiently prevented in short time.


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WO/2016/162016CONVERTER
Inventors:
Kitamura, Shinya
Ogawa, Yuji
Imoto, Takeo
Application Number:
JP674495A
Publication Date:
October 15, 2002
Filing Date:
January 19, 1995
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C21C5/32; (IPC1-7): C21C5/32
Attorney, Agent or Firm:
矢葺 知之 (外1名)