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Briquette for producing a foamed slag effect in eaf technology in stainless steel production

a technology of foamed slag and briquette, which is applied in sustainable manufacturing/processing, electric furnaces, furnaces, etc., can solve the problems of unsatisfactory all-in-one, increase the bath weight, increase and improve the viscosity and basicity of slag. , the effect of increasing the bath weigh

Inactive Publication Date: 2014-12-04
SMS GRP GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes using foaming in EAF metallurgy to improve the thermal efficiency of the furnace, reduce the consumption of materials, and stabilize the process. The use of foam is made possible by the relative density of additives, which helps bring the gas production reaction to the slag / metal interface. The process also results in increased bath weight, the production of CO2 to support foaming, and increased viscosity and basicity of the slag. Overall, this patent provides technical solutions for better controlling foaming in EAF metallurgy.

Problems solved by technology

However, the situation is different when this is to be applied to foams on steels with high chromium content, since the significant uptake of chromium oxide by the slag causes problems.
To be sure, methods for foaming slag with high chromium content are known, but all of them are unsatisfactory.

Method used

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  • Briquette for producing a foamed slag effect in eaf technology in stainless steel production
  • Briquette for producing a foamed slag effect in eaf technology in stainless steel production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060]The composition of the briquette can be specified as follows:

Fe2O3, Fe3O410-70 in % C2-16 in %Ballast material14-78 in % CaCO30-10 in %CaO, CaF20-10 in %Al2O30-10 in %

[0061]The assumptions that follow are used to determine the relative density of the foam former, wherein Fe2O3,m, is to be understood as a mixture of Fe2O3 with graphite.[0062]The relative density of the Fe2O3,m is given by the formula:

PFe2o3m=PFe2o3·%Fe2o3100%+Pc·%c100%(8)

that of the foam former:

P=PFe2o3,m·%Fe2o3,m100%+PBalast·%Balast100%+PcaCO3·%CaCO3100%+PBinders%Binder100%(9)

wherein ballast means FeCr or scrap and nickel oxide

%Fe2O3,m+100%Balast+%CaCO3+%Binder=100%  (10)[0063]The CaCO3 content can be replaced by CaF2 contents, wherein in particular it can be assumed that % CaCO3=0 or CaF2=0.

[0064]The relative density of the foam former can be seen in Table 1 below.

TABLE 1Relative density of the pure monolithic foam former components used for determining the density of the materialFerriticComponentFeCrFe2O3CCa...

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Abstract

Briquette for producing a foamed slag on stainless steel melts in an electric arc furnace, made up of mixtures of individual or multiple substances of following basic components:O2 carrier Dust, sludge or slag with ≧10% FeO / Fe2O3,Dust, sludge or slag with ≧1% Cr2O3,Dust, sludge or slag with ≧1% MnO,Dust, sludge or slag with ≧1% NiO,Scale with ≧10% FeO / Fe2O3,Gas carrier Dust with ≧40% CaCO3,Density adjuster Dust with FeCr,Dust with Fe / low alloy fine scrap,Dust with Cr / ferritic fine scrap,Dust with Ni / austenitic fine scrap, grinding dust,Dust with Mn / ferritic or low alloy fine scrap,Reducing agent Carbon-containing substances ≧90% C,Dust or fine granulate of coke, coal or graphite,Binder Molasses, cement, Ca(OH)2, in each case ≦5% by weight.

Description

RELATED APPLICATIONS[0001]This application is a continuation-in-part of application Ser. No. 13 / 634,710 filed Oct. 12, 2012 and which is a National Stage Application based on a PCT application PCT / EP2011 / 050880 filed on Jan. 24, 2011 and claiming priority of German applications No. 10 2010 011 712.9 filed Mar. 17, 2010 and No. 10 2010 022 692.0 filed Jun. 4, 2010, all of the applications mentioned herein being incorporated by reference thereto.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a briquette for producing a foamed slag on stainless steel melts in an electric arc furnace, containing a mixture of metal oxides, limestone, carbon, and a binder which is placed in the furnace and arranged there such that the metal oxides are reduced and the limestone is thermally dissociated beneath the slag at the metal-slag interface and the gases formed in this process make the slag foam by forming bubbles.[0004]2. Description of the Prior Art[0005]In...

Claims

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Application Information

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IPC IPC(8): C10L5/36C21C7/00
CPCC10L5/361C21C5/54C21C2300/02C21C7/0087C21C5/005Y02P10/20
Inventor REICHEL, JOHANNROSE, LUTZ
Owner SMS GRP GMBH