Method of producing molten iron using electric furnace including video device

Patent metadata

Field	Value
Publication number	US-12566029-B2
Application number	US-202218263538-A
Country	US
Kind code	B2
Filing date	Jan 27, 2022
Priority date	Feb 10, 2021
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

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.

First claim

The invention claimed is:

1 . A method of producing molten iron using an electric furnace that includes a preheating chamber, and a melting chamber,
wherein the electric furnace further includes an extruder located in the preheating chamber, and a video device configured to observe an inside of the melting chamber, and the method comprises: an extrusion process, performed in the preheating chamber, of supplying a cold iron source preheated in the preheating chamber to the melting chamber by the extruder; and a melting process, performed in the melting chamber, of melting the cold iron source supplied to the melting chamber by arc heat to obtain molten iron, wherein in the extrusion process, one or both of a moving amount of the extruder and a time interval for moving the extruder are controlled based on visual information obtained from the video device, and wherein in the extrusion process, further, one or both of increasing the moving amount and reducing the time interval are performed in the case where an extrusion pressure of the extruder is 40 MPa or less.

2 . The method of producing molten iron according to claim 1 , wherein in the extrusion process, one or both of increasing the moving amount and reducing the time interval are performed in the case where the visual information obtained from the video device indicates that the cold iron source is not supplied from the preheating chamber to the melting chamber.

Assignees

• Jfe Steel Corp

Inventors

• Tsutsumi Koichi
• Miwa Yoshihiro
• Nagashima Shohei
• Okuyama Goro
• Endo Katsutoshi
• Kawanami Shunichi

Classifications

• C21B13/12

  in electric furnaces · CPC title

• C21C5/527

  Charging of the electric furnace · CPC title

• F27D2021/026

  using a video installation · CPC title

• F27D21/02

  Observation or illuminating devices · CPC title

• F27B3/18

  Arrangements of devices for charging · CPC title