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Title:
METHOD FOR REFINING MOLTEN IRON
Document Type and Number:
WIPO Patent Application WO/2019/117200
Kind Code:
A1
Abstract:
The present invention addresses the problem of highly precisely adjusting the basicity of secondary blowing slag. This method for refining molten iron comprises: setting an intermediate deslagging amount of primary blowing slag to a target variable in advance when using a converter container to refine molten iron; performing a multiple-regression analysis in which information that includes at least one of the basicity of the primary blowing slag and the initial angle of slag discharge, and also includes a primary blowing slag amount, is used as an explanatory variable; charging the molten iron into the converter container and performing primary blowing; subsequently performing intermediate deslagging in which some of the slag after the primary blowing process is discharged to outside of the container, and then using the result of multiple-regression analysis to calculate the intermediate deslagging amount of primary blowing slag and an in-furnace residual amount of the primary blowing slag; and then, when adding lime-based flux to the slag and post-primary-blowing molten iron that remained in the container and performing secondary blowing, using the in-furnace residual amount of the primary blowing slag and a computed composition of the primary blowing slag to calculate the amount of lime-based flux to add in the secondary blowing process without extending a steelmaking time.

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Inventors:
SASAKI NAOTAKA (JP)
MORI MIKIHIRO (JP)
NEGISHI HIDEMITSU (JP)
KAWABATA RYO (JP)
Application Number:
PCT/JP2018/045692
Publication Date:
June 20, 2019
Filing Date:
December 12, 2018
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C21C5/28; C21C1/02; C21C1/04; C21C5/46
Foreign References:
JP2010126790A2010-06-10
JP2007077483A2007-03-29
JPH03158408A1991-07-08
JP2018119195A2018-08-02
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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