Method for producing foamed slag on high-chromium melts in an electric furnace

a technology of high-chromium steel melts and foamed slag, which is applied in the direction of electric furnaces, furnaces, metal processing, etc., can solve the problems of time delay in reaction and foaming reaction, and achieve the effect of reducing the chromium increasing and reducing the chromium oxide content of the slag

Inactive Publication Date: 2013-01-03
SMS DEMAG AG
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  • Application Information

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Benefits of technology

[0017]Furthermore, a slag thinner, preferably CaF2, can be additionally pressed into or bound with the mixture. This counteracts the tendency of chromium-containing slags to become increasingly viscous with increasing chromium oxide content.
[0018]It is also advisable to press a reducing agent, such as s

Problems solved by technology

Furthermore, the pellets should have a density or a degree of compaction that causes them to disintegrate uniformly and slowly, so that the foaming reaction occurs uni

Method used

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  • Method for producing foamed slag on high-chromium melts in an electric furnace
  • Method for producing foamed slag on high-chromium melts in an electric furnace

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Embodiment Construction

[0024]The electric arc furnace 1 shown in FIG. 1 comprises a furnace shell 2 with a refractory wall 3 and a furnace roof 4. After the furnace has been charged with scrap and alloying components, three electrodes (in the present case) 5a-c are lowered into the interior of the furnace. The solid material is melted down by the electric arcs that are produced. A slag layer 7 is formed and floats on the melt. To initiate a foaming reaction of the slag 7 between the electrodes 5a-c and the refractory furnace wall 3, slag-foaming material is introduced into the interior of the furnace as preforms 8, namely, in the form of pellets. The pellets are preferably charged through the furnace roof 4, specifically, through the fifth roof hole 9, and / or the sidewalls 10. Injection systems with injection lines or gravity feed systems 11 that extend through the sidewalls 10 of the furnace are provided for this purpose. Instead of injection lines, it is also possible to use injection lances.

[0025]Alter...

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Abstract

The invention relates to a method for producing foamed slag on high-chromium steel melts in an electric furnace, whereby a mixture consisting of a metal oxide and carbon is introduced into the furnace, the metal oxide in the slag is reduced by the carbon, and the gases created in the slag form bubbles which thus foam up the slag. In order to be able to control the gas formation and thus the foaming process, the mixture consisting of a metal oxide and carbon and optionally an iron carrier is introduced as preforms, such as pellets, which are compressed and/or provided with a binding agent. The gas formation can be controlled in terms of location, type and time, by adjusting the characteristics of the pellets, especially the density and/or compression characteristics thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a Continuation of U.S. patent application Ser. No. 10 / 557,190, filed Nov. 18, 2005, which is a 371 of International application PCT / EP2004 / 004312, filed Apr. 23, 2004, which claims priority of DE 103 23 505.1, filed May 24, 2003, the priority of these applications is hereby claimed and these applications are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The invention concerns a method for producing foamed slag on high-chromium steel melts in an electric arc furnace, wherein a mixture of a metal oxide and carbon is introduced into the furnace, the metal oxide is reduced by the carbon in the slag, and the resulting gases bring about the foaming of the slag by bubble formation.[0003]In the operation of electric arc furnaces, the charge, i.e., mainly scrap, and alloys are melted by the electric arcs of the electrodes, which extend downward into the furnace shell. The slag fulfils not only its pri...

Claims

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Application Information

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IPC IPC(8): C21C5/54C21C5/52C21C7/00
CPCC21C5/5264C21C5/54C21C2300/02C21C7/0087C21C7/0037Y02P10/20C21C5/52C21C7/00
Inventor ROSE, LUTZREICHEL, JOHANN
Owner SMS DEMAG AG
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