Method of operating electric arc furnace
AssigneeDaido Steel Co., Ltd.
InventorsNoriyuki Tomita, Yoshikazu Tanaka
Life of this patent
Estimating the term…
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.
Claims4
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.
Dependencies are inferred from the claim text.