Reduction processing apparatus for steel-making slag and reduction processing system for steel-making slag

Patent metadata

Field	Value
Publication number	US-9238846-B2
Application number	US-201314353961-A
Country	US
Kind code	B2
Filing date	Jun 27, 2013
Priority date	Jun 27, 2012
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

This reduction processing apparatus for a steel-making slag that continuously performs reduction processing to a hot steel-making slag by using an electric furnace includes: a slag-supplying container that charges the hot steel-making slag into the electric furnace; an electrode that is provided at the electric furnace and heats a molten slag layer on a molten iron produced by reducing the hot steel-making slag; an auxiliary-raw-material supplying unit that supplies an auxiliary-raw-material including a reducing agent to the molten slag layer; and a tilting unit that tilts the slag-supplying container and adjusts a charging amount of the hot steel-making slag to the electric furnace.

First claim

The invention claimed is:

1. A reduction processing apparatus for a steel-making slag that continuously performs reduction processing to a hot steel-making slag by using an electric furnace, the apparatus comprising:
a slag-supplying container configured to charge the hot steel-making slag having fluidity into the electric furnace the hot-steel making slag having a rate of solid phase of not more than 30% if a temperature of the hot steel-making slag is 1400° C.;
an electrode that is provided at the electric furnace and heats a molten slag layer on a molten iron produced by reducing the hot steel-making slag together with the molten iron;
an auxiliary-raw-material supplying unit that supplies an auxiliary-raw-material including a reducing agent to the molten slag layer; and
a tilting unit that tilts the slag-supplying container with a tilting axis being a center, and adjusts a charging amount of the hot steel-making slag to the electric furnace,
wherein the electric furnace is a closed and fixed electric furnace.

2. The reduction processing apparatus for a steel-making slag according to claim 1 , wherein the closed and fixed electric furnace is a direct-current electric furnace.

3. The reduction processing apparatus for a steel-making slag according to claim 1 , wherein the auxiliary-raw-material supplying unit is an auxiliary-raw-material supplying tube which is provided in the electrode.

4. The reduction processing apparatus for a steel-making slag according to claim 1 , wherein the slag-supplying container is provided with an exhausting portion that discharges exhaust gas from the electric furnace.

5. A reduction processing system for a steel-making slag by using the reduction processing apparatus according to claim 1 , the system comprising:
a measuring unit that measures electric power supplied to the electrode;
a calculation unit that calculates an amount of the hot steel-making slag to be reduced based on the measured electric power, and then calculates a predetermined amount of reducing agent based on the calculated amount of the hot steel-making slag to be reduced; and
a control unit that controls a tilting angle of the slag-supplying container by actuating the tilting unit such that an amount of the hot steel-making slag charged into the electric furnace follows the amount of the hot steel-making slag to be reduced, and controls an amount of the auxiliary-raw-material supplied from the auxiliary-raw-material supplying unit so as to supply the predetermined amount of the reducing agent.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Harada Toshiya
• Arai Takashi
• FUKUMURA Hiroki

Classifications

• C21C7/0087 Primary

  Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal · CPC title

• C21C5/527

  Charging of the electric furnace · CPC title

• C04B5/06

  Ingredients, other than water, added to the molten slag {or to the granulating medium or before remelting}; Treatment with gases or gas generating compounds, e.g. to obtain porous slag · CPC title

• F27B3/183

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

• F27D15/00

  Handling or treating discharged material; Supports or receiving chambers therefor · CPC title