公开(公告)号：US20240241058A1

公开(公告)日：2024-07-18

申请号：US18560104

申请日：2022-03-10

Applicant: JFE STEEL CORPORATION

Inventor： Masao INOSE ,  Seiya SUGAWARA

IPC: G01N21/71 ,  C21C5/46

CPC classification number: G01N21/718 ,  C21C5/4673 ,  G01N2201/0697 ,  G01N2201/129

Abstract: Provided is a slag component analysis method capable of quickly and accurately measuring slag components generated during refining of molten iron. The method comprises: irradiating a surface of slag to be analyzed with a pulse laser a plurality of times to turn part of the slag into plasma; dispersing excitation light obtained from the slag turned into plasma and acquiring an emission spectrum of an element contained in the slag per one pulse laser irradiation or per a plurality of pulse laser irradiations; and deriving a target component concentration or component amount ratio from the acquired emission spectrum, wherein the slag to be analyzed is slag generated in a converter-type refining furnace, and in the process of turning part of the slag into plasma, the pulse laser is applied from a side of the converter-type refining furnace tilted to remove the slag generated in the converter-type refining furnace.

公开(公告)号：US20170247773A1

公开(公告)日：2017-08-31

申请号：US15592693

申请日：2017-05-11

Applicant: JFE STEEL CORPORATION

Inventor： Satoshi KINOSHIRO ,  Toshiyuki ITO ,  Ryo KAWABATA ,  Toshiro ISHIGE ,  Kyoko FUJIMOTO ,  Masao INOSE

IPC: C21C7/064 ,  G01N33/00 ,  C21C7/06 ,  G01N21/64 ,  C21C7/00 ,  C21C7/10

CPC classification number: C21C7/0645 ,  C21C1/02 ,  C21C7/0006 ,  C21C7/0037 ,  C21C7/0075 ,  C21C7/0087 ,  C21C7/06 ,  C21C7/064 ,  C21C7/10 ,  C21C2007/0093 ,  C21C2300/08 ,  F27D19/00 ,  F27D21/00 ,  G01N21/64 ,  G01N21/645 ,  G01N33/0042 ,  Y02A50/248

Abstract: A method for desulfurizing molten steel comprising taking a sample out from molten steel after tapping from a converter or during secondary refining and analyzing the sample rapidly with high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in an oxygen atmosphere having an oxygen purity of 99.5 vol % or more to convert S in the sample into SO2 and an analyzing step wherein SO2-containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify S concentration of the sample.