Title:
DEPHOSPHORIZATION TREATMENT METHOD FOR MOLTEN IRON IN CONVERTER
Document Type and Number:
Japanese Patent JP2015042780
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To carry out a dephosphorization reaction efficiently by controlling the basicity of slag present in a converter from the start to the completion of a dephosphorization treatment, in carrying out the dephosphorization treatment of molten iron by blowing a flux for dephosphorization, together with oxygen gas, onto molten iron in the converter from a top-blown lance.SOLUTION: A dephosphorization treatment method for molten iron in a converter comprises blowing oxygen gas onto molten iron 18 in a converter 2 from a top-blown lance and supplying a flux 20 for dephosphorization based on CaO to the molten iron in the converter to oxidize phosphorus in the molten iron by oxygen gas and capturing produced phosphorus oxides in the slag-formed flux for dephosphorization so as to remove phosphorus in molten iron. At least a part of the flux for dephosphorization is added to the bath surface of the molten iron in the converter by blowing from the top-blown lance, and the minimum value of the basicity, (mass%CaO)/(mass%SiO), of the slag in the converter from the start to the completion of the dephosphorization treatment is controlled to be 0.80 or higher and lower than 1.20.
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Inventors:
NEGISHI HIDEMITSU
KAWABATA RYO
UCHIDA YUICHI
ISHIGE TOSHIAKI
WATANABE ATSUSHI
KAWABATA RYO
UCHIDA YUICHI
ISHIGE TOSHIAKI
WATANABE ATSUSHI
Application Number:
JP2014151371A
Publication Date:
March 05, 2015
Filing Date:
July 25, 2014
Export Citation:
Assignee:
JFE STEEL CORP
International Classes:
C21C1/02; C21C5/35; C21C5/36
Domestic Patent References:
| JP2013136831A | 2013-07-11 | |||
| JP2007224388A | 2007-09-06 | |||
| JP2013064167A | 2013-04-11 | |||
| JP2012126946A | 2012-07-05 |
Attorney, Agent or Firm:
Shigeru Inoue
Woods Kazuhiro
Woods Kazuhiro