A preliminary treatment method of molten iron

Japanese Patent JP5950133

B2

A molten iron pre-treatment method for performing desiliconization and dephosphorization of molten iron using a single converter-type refining furnace by supplying an oxygen source to the molten iron in the converter-type refining furnace to desiliconize same, then discharging some of the slag present in the furnace while retaining the molten iron inside the furnace, and subsequently supplying a CaO solvent and an oxygen source into the converter-type refining furnace and tapping the dephosphorized molten iron from the converter-type refining furnace. By analyzing the concentration of at least one carbon atom-containing gaseous species in suctioned gas drawn using an exhaust gas treatment device of the converter-type refining furnace during the desiliconization and determining the desiliconization completion time point on the basis of said analysis value, the subsequent dephosphorization process can be performed at low cost while limiting decreases in molten iron temperature.

Ryo Kawabata
Kotaro Tanaka
Hidemitsu Negishi
Ishige Toshiro
Naoki Kikuchi
Yuichi Uchida
Yasushi Ogasawara
Naoki Sasaki
Yozo Iwaki
Norihiko Suzuki
Masaomi Senoo
Ido Hiroharu
Manabu Tano
Akira Ichikawa

JP2014262230A

July 13, 2016

December 25, 2014

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jfe Steel Corporation

C21C1/02; C21C1/04; C21C5/36; C21C5/46; F27D17/00

JP10152714A
JP2209411A
JP2008184648A

Ginza Marronnier Patent Office

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