Electric furnace

Patent metadata

Field	Value
Publication number	US-11898797-B2
Application number	US-201716468615-A
Country	US
Kind code	B2
Filing date	Nov 10, 2017
Priority date	Dec 16, 2016
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

The present invention provides an electric furnace including: a furnace body that includes an electrode; and a slag holding furnace that is configured to hold molten slag in a molten state and is capable of pouring the molten slag into the furnace body when tilted, in which the furnace body includes a cylindrical furnace wall, a furnace cover that is provided at an upper end of the furnace wall, a furnace bottom that is provided at a lower end of the furnace wall and includes a deep bottom portion and a shallow bottom portion as a region having a height of 150 mm to 500 mm from a deepest point of the deep bottom portion, and a slag pouring port that is provided at the furnace cover and through which the molten slag is poured from the slag holding furnace, the slag pouring port overlaps the shallow bottom portion in a plan view, and the area ratio of the shallow bottom portion to the furnace bottom in a plan view is 5% to 40%.

First claim

What is claimed is:

1. An electric furnace comprising:
a furnace body that includes an upper electrode and a furnace bottom electrode vertically facing each other at the center of the furnace body; and
a slag holding furnace that is configured to hold molten slag in a molten state and is capable of pouring the molten slag into the furnace body when tilted,
wherein the furnace body includes
a furnace wall,
a main body portion having an annular cross-sectional shape perpendicular to a height direction,
a projected portion that is configured to project radially outward from the main body portion,
a shallow bottom portion provided at a lower end of the projected portion,
a furnace cover that is provided at an upper end of the furnace wall,
a furnace bottom that is provided at a lower end of the furnace wall and includes a deep bottom portion and the shallow bottom portion as a region having a height of 150 mm to 500 mm from a deepest point of the deep bottom portion,
a slag pouring port that is provided at the furnace cover and at an upper end of the projected portion, and through which the molten slag is poured from the slag holding furnace,
the slag pouring port overlapping the shallow bottom portion in a plan view,
an area ratio of the shallow bottom portion to the furnace bottom portion in a plan view is 5% to 40%,
a reducing material feeding port provided at the furnace cover above the deep bottom portion or the furnace wall above the deep bottom portion, and through which a reducing material is added into the electric furnace, and
a raw material supply device connecting to the reducing material feeding port.

Assignees

• Nippon Steel Corp

Inventors

• Harada Toshiya
• Arai Takashi

Classifications

• F27B3/105 Primary

  Slag chamber · CPC title

• F27B3/04

  of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces · CPC title

• F27B3/06

  with movable working chambers or hearths, e.g. tiltable {, oscillating or describing a composed movement} · CPC title

• F27B3/065

  tiltable · CPC title

• F27B3/08 Primary

  heated electrically, with or without any other source of heat · CPC title