公开(公告)号：US20240085110A1

公开(公告)日：2024-03-14

申请号：US18263538

申请日：2022-01-27

Applicant: JFE STEEL CORPORATION

Inventor： Koichi TSUTSUMI ,  Yoshihiro MIWA ,  Shohei NAGASHIMA ,  Goro OKUYAMA ,  Katsutoshi ENDO ,  Shunichi KAWANAMI

IPC: F27B3/28 ,  C21B11/10 ,  F27B3/18 ,  F27D21/02

CPC classification number: F27B3/28 ,  C21B11/10 ,  F27B3/18 ,  F27D21/02 ,  F27D2021/026

Abstract: To ensure stable supply of a cold iron source to a melting chamber, a method of producing molten iron uses an electric furnace that includes: a preheating chamber; a melting chamber; an extruder located in the preheating chamber; and a video device configured to observe an inside of the melting chamber, and comprises: an extrusion process of supplying a cold iron source preheated in the preheating chamber to the melting chamber by the extruder; and a melting process of melting the cold iron source supplied to the melting chamber by arc heat to obtain molten iron, wherein in the extrusion process, a moving amount of the extruder and/or a time interval for moving the extruder is controlled based on visual information obtained from the video device.