The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2016
Filed:
Jul. 19, 2012
Shizuhiko Ikeno, Fukuyama, JP;
Yozo Iwaki, Fukuyama, JP;
Naotaka Sasaki, Chiba, JP;
Takeshi Ishii, Fukuyama, JP;
Yuichi Uchida, Chiba, JP;
Masanori Nishikori, Fukuyama, JP;
Shizuhiko Ikeno, Fukuyama, JP;
Yozo Iwaki, Fukuyama, JP;
Naotaka Sasaki, Chiba, JP;
Takeshi Ishii, Fukuyama, JP;
Yuichi Uchida, Chiba, JP;
Masanori Nishikori, Fukuyama, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
In a molten iron refining method by charging molten iron and a cold iron source into a converter type refining vessel, supplying a material containing CaO with an oxygen source dissolving the cold iron source and conducting molten iron desiliconization, removing at least a part of the produced slag as an intermediate slag removal, and supplying a slag-forming agent and an oxygen source to the molten iron for dephosphorization, a silicon-containing material or a combination of it and carbonaceous material is added in the desiliconization then carried out under conditions such that the slag basicity (mass % CaO/mass % SiO) in the desiliconization completion is more than 0.5 but less than 1.5 and a molten iron temperature in the desiliconization completion is more than 1280° C. but less than 1350° C. and more than 30 mass % of the slag produced in the desiliconization is removed from the vessel in the intermediate slag removal.