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Title:
DEPHOSPHORIZATION METHOD FOR MOLTEN IRON
Document Type and Number:
WIPO Patent Application WO/2019/172195
Kind Code:
A1
Abstract:
A dephosphorization method for molten iron according to an embodiment of the present invention comprises a step for measuring the amount of Si contained in an initial component of the molten iron, a step for injecting a first dephosphorization agent into the molten iron, and a step for subjecting the molten iron to dephosphorization blowing. During the dephosphorization blowing step a powdery second dephosphorization agent also is injected into the molten iron, and the injection of the second dephosphorization agent is started after the Si content in the molten iron has been brought to 0.10 mass% or less by the dephosphorization blowing and before the amount of oxygen blown into the molten iron reaches 3.0 Nm3/t.

Inventors:
KINOSHITA Satoshi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
TANABE Kentaro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
KAKIMOTO Shohei (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
KITANO Ryo (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2019/008447
Publication Date:
September 12, 2019
Filing Date:
March 04, 2019
Export Citation:
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Assignee:
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
C21C1/02; F27D3/18; C21C5/28
Attorney, Agent or Firm:
TANAI Sumio et al. (1-9-2, Marunouchi Chiyoda-k, Tokyo 20, 〒1006620, JP)
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