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Title:
REFINING METHOD FOR CONVERTER
Document Type and Number:
Japanese Patent JP2014224309
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a refining method for a converter which can reduce the dust generation rate while keeping high decarbonization oxygen efficiency, in decarbonization refining of molten iron by top-blowing an oxidative gas.SOLUTION: In removing carbon in molten iron, through oxidation, by blowing an oxidative gas onto the surface of molten iron in a converter from a top-blowing lance arranged, at its tip, with a Laval nozzle or a straight nozzle with an outlet diameter D(mm) and a throat diameter D(mm) meeting a condition D≥D, a top-blowing lance is used which includes a Laval nozzle or a straight nozzle having four holes arranged around the central axis of the top-blowing lance and each having the central axis with an inclination angle to the central axis of the top-blowing lance being 18-22°.

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Inventors:
TAKAHASHI YUKIO
KIKUCHI NAOKI
UCHIDA YUICHI
INOUE TADAHIRO
ISOGAWA TORU
MIKI YUJI
Application Number:
JP2014065170A
Publication Date:
December 04, 2014
Filing Date:
March 27, 2014
Export Citation:
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Assignee:
JFE STEEL CORP
International Classes:
C21C5/46; C21C5/35
Domestic Patent References:
JPH1180825A1999-03-26
JPS5861213A1983-04-12
JPH09209021A1997-08-12
JP2008274315A2008-11-13
JPH10219332A1998-08-18
Attorney, Agent or Firm:
Patent business corporation Ginza horse chestnut patent firm



 
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