Electric furnace

Patent metadata

Field	Value
Publication number	US-11473841-B2
Application number	US-201716465501-A
Country	US
Kind code	B2
Filing date	Nov 10, 2017
Priority date	Dec 16, 2016
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

The present invention provides an electric furnace including: a cylindrical furnace wall; a furnace cover that is provided at an upper end of the furnace wall; and 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, in which a slag pouring port into which molten slag or a solidified slag lump is capable of being poured from a slag transport container directly or through a tilting trough is provided, 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 cylindrical furnace wall;
a furnace cover that is provided at an upper end of the furnace wall; and
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,
wherein a slag pouting port into which molten slag or a solidified slag lump is capable of being poured from a slag transport container directly or through a tilting trough is provided,
the slag pouring port overlaps the shallow bottom portion in a plan view, and
an area ratio of the shallow bottom portion to the furnace bottom in a plan view is 5% to 40% and further comprising:
a tilting portion that is configured to tilt the electric furnace;
a slag hole that is provided at a position of the furnace wall higher than a maximum height of the shallow bottom portion and through which molten slag is discharged; and
a furnace bottom tap hole that is a bottom hole of an electric furnace projected portion immersed in molten iron during the tilting of the electric furnace and that is provided at a position confronting and aligned with the slag hole on an extended position of the deep bottom portion and through which the molten iron is discharged by tilting.

2. The electric furnace according to claim 1 , further comprising:
a reducing material feeding nozzle that is provided at the furnace cover or at both the furnace cover and the furnace wall and through which a reducing material is added into the electric furnace; and
an exhaust duct that is provided at the furnace cover.

3. The electric furnace according to claim 1 ,
wherein the slag pouring port is provided at the furnace cover and is covered with an openable slag pouring door.

4. The electric furnace according to claim 1 , wherein the furnace cover is movable between a first state and a second state, in the first state where the furnace cover is positioned at the upper end of the furnace wall, the inside of the electric furnace is closed, and in the second state where the furnace cover is positioned at a lateral side, the slag pouring port is exposed.

5. The electric furnace according to claim 2 , wherein the furnace cover is movable between a first state and a second state, in the first state where the furnace cover is positioned at the upper end of the furnace wall, the inside of the electric furnace is closed, and in the second state where the furnace cover is positioned at a lateral side, the slag pouring port is exposed.

6. The electric furnace according to claim 3 , wherein the furnace cover is movable between a first state and a second state, in the first state where the furnace cover is positioned at the upper end of the furnace wall, the inside of the electric furnace is closed, and in the second state where the furnace cover is positioned at a lateral side, the slag pouring port is exposed.

Assignees

• Nippon Steel Corp

Inventors

• Harada Toshiya

Classifications

• F27M2001/023

  Ferrites · CPC title

• F27D3/0026

  Introducing additives into the melt · CPC title

• F27D3/14

  Charging or discharging liquid or molten material · CPC title

• F27D1/1858

  Doors · CPC title

• C21C2200/00

  Recycling of waste material · CPC title