Method of operating electric arc furnace

Patent metadata

Field	Value
Publication number	US-10001324-B2
Application number	US-201514930793-A
Country	US
Kind code	B2
Filing date	Nov 3, 2015
Priority date	Nov 5, 2014
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A method of operating an electric arc furnace containing a furnace shell having a tapping hole, a plurality of electrodes, and a rotating apparatus that rotates the furnace shell around a vertical axis relative to the electrodes, the method contains a charging step of opening an opening-and-closing door of a scrap bucket containing a metal material and falling the metal material into the furnace shell in which the furnace shell is rotated by the rotating apparatus until a direction of a line connecting a center of the furnace shell to a center of the tapping hole intersects an extension direction of a seam at a closing side of the opening-and-closing door, the opening-and-closing door is opened in this positional relationship to charge the metal material.

First claim

What is claimed is:

1. A method of operating an electric arc furnace,
wherein the electric arc furnace comprises:
(a) a furnace shell that includes a cylindrical circumferential wall portion, a furnace bottom portion and a tapping hole;
(b) a furnace roof that has a plurality of electrodes provided so as to face downwards; and
(c) a rotating apparatus that rotates the furnace shell around a vertical axis relative to the electrodes,
wherein the method comprises:
a charging step of, above the furnace shell, opening an opening-and-closing door on a bottom portion of a scrap bucket, which contains a metal material, to form an opening, and falling the metal material into the furnace shell via the opening, and
a melting step of melting the metal material, and
wherein the furnace shell is rotated by the rotating apparatus until achieving a positional relationship in which a direction of a line connecting a center of the furnace shell to a center of the tapping hole intersects an extension direction of a seam at a closing side of the opening-and-closing door of the scrap bucket, then the opening-and-closing door of the scrap bucket is opened in this positional relationship, and the metal material is charged.

2. The method of operating an electric arc furnace according to claim 1 ,
wherein the furnace shell further comprises a slag door provided on the line connecting the center of the furnace shell to the center of the tapping hole.

3. The method of operating an electric arc furnace according to claim 2 , further comprising:
a rotating step of rotating the furnace shell during the melting step after the charging step.

4. The method of operating an electric arc furnace according to claim 1 , further comprising:
a rotating step of rotating the furnace shell during the melting step after the charging step.

Assignees

• Daido Steel Co Ltd

Inventors

• Tomita Noriyuki
• Tanaka Yoshikazu

Classifications

• F27B3/12

  Working chambers or casings; Supports therefor · CPC title

• F27B3/085

  Arc furnaces · CPC title

• F27B2005/143

  Heating rods disposed in the chamber · CPC title

• F27D2099/0098

  Means for moving the furnace · CPC title

• F27B3/183

  Charging of arc furnaces vertically through the roof, e.g. in three points · CPC title