Title:
METHOD FOR REFINING HOT PIG IRON IN CONVERTER
Document Type and Number:
Japanese Patent JP2015092018
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To efficiently remove phosphorous in hot pig iron when a CaO based flux is blown to the ignition point of the hot pig iron bath face in a converter via a top-blow lance, and the hot pig iron is subjected to dephosphorization refining or decarbonization refining.SOLUTION: Regarding the method for refining hot pig iron, when an oxygen gas is blown to hot pig iron in a converter from a top-blown lance, also, a CaO based flux is blown to the impact face in the bath face of the hot pig iron of the oxygen gas from the top-blown lance, and the hot pig iron in the converter is subjected to dephosphorization refining or decarburization refining, the blowing of the CaO based flux from the top-blown lance is performed over the whole period or a part of period from the start of the blowing of an oxygen gas to the point of time at which the 40 vol% oxygen gas of the estimated acid feed amount is fed, and is further performed over the whole period or a part of period from the point of time at which 70 vol% oxygen gas of the estimated acid feed amount is fed to the completion of refining, and in a period at which an oxygen gas below 70 vol% of the estimated acid feed amount is fed after the point of time at which an oxygen gas of 40 vol% of the estimated acid feed amount is fed, the blowing of the CaO based flux from the top-blown lance is stopped.
Inventors:
NORITAKE TAKAFUMI
ASAHINA TAKESHI
OSHIMA KENJI
ASAHINA TAKESHI
OSHIMA KENJI
Application Number:
JP2014198026A
Publication Date:
May 14, 2015
Filing Date:
September 29, 2014
Export Citation:
Assignee:
JFE STEEL CORP
International Classes:
C21C5/35; C21C1/02
Domestic Patent References:
| JP2010121158A | 2010-06-03 | |||
| JPS5861211A | 1983-04-12 | |||
| JPS63192814A | 1988-08-10 | |||
| JP2002256320A | 2002-09-11 | |||
| JP2010095786A | 2010-04-30 | |||
| JPS58207315A | 1983-12-02 | |||
| JP2010121158A | 2010-06-03 | |||
| JPS5861211A | 1983-04-12 | |||
| JPS63192814A | 1988-08-10 | |||
| JP2002256320A | 2002-09-11 | |||
| JP2010095786A | 2010-04-30 |
Foreign References:
| US4488903A | 1984-12-18 | |||
| US4488903A | 1984-12-18 |
Attorney, Agent or Firm:
Shigeru Inoue
Kazuhiro Mori
Kazuhiro Mori
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