scholarly journals Effect of partially reduced highly fluxed DRI pellets on impurities removal during steelmaking using a laboratory scale EAF

2021 ◽  
pp. 50-50
Author(s):  
R.K. Dishwar ◽  
O.P. Sinha
Keyword(s):  
Reaction Time ◽  
Comparative Study ◽  
Phosphorus Removal ◽  
Sulfur Removal ◽  
Electric Arc ◽  
Pig Iron ◽  
Arc Furnace ◽  
Direct Reduced Iron ◽  
Removal Of Impurities ◽  
Impurities Removal

The present work represents a comparative study on the impurities removal from pig iron melt by addition of partially reduced highly fluxed direct reduced iron (DRI) to make steel in a 2 kg capacity electric arc furnace (EAF). Three types of fluxed DRI (30, 50, 80% Reduction (%R) with similar basicity-8) were used to maintain different level of oxidizing potential on the bath for studying the kinetic behaviour of impurities removal from melt. Results showed that the rate of removal of impurities (i.e. C, Si, Mn, P, S etc.) was increased initially up to 5 minutes of reaction time then decreased afterwards. Phosphorus (~64%), sulfur (~16%) and carbon (~94%) were removed simultaneously up to 25 minutes of reaction time using 30%R fluxed DRI. Similarly, phosphorus (~33%), sulfur (~50%) and carbon (~62%) were removed simultaneously using 50%R fluxed DRI while highly reduced (80%R) flux DRI removed sulfur (~58%), carbon (~56%) with a small fraction of phosphorus (~18%) from pig iron. It was observed in all the cases that silicon (>99%) and manganese (>80%) were removed. From the present study, it can be concluded that ~30%R DRI is favorable for effective phosphorus removal whereas ~80%R is favorable for sulfur removal. The significant removal of impurities could be achieved by charging ~50%R fluxed DRI in the pig iron melt.

scholarly journals Effect of Direct Reduced Iron on Ferrous Oxide Capacity of Slag in Electric Arc Furnace.

2019 ◽  
Vol 108 (1) ◽  
pp. 64-76
Author(s):  
H. A. Abdelwahed ◽  
M. Shaheen ◽  
G. M. Megahed ◽  
E. Ahmed ◽  
M. Meraikib
Keyword(s):  
Electric Arc Furnace ◽  
Electric Arc ◽  
Ferrous Oxide ◽  
Arc Furnace ◽  
Direct Reduced Iron

Utilization of direct reduced iron in an electric arc furnace

1976 ◽  
Vol 15 (1) ◽  
pp. 41-47
Author(s):  
L.M. Kay ◽  
M. Rigaud ◽  
A.H. Marquis
Keyword(s):  
Electric Arc Furnace ◽  
Electric Arc ◽  
Arc Furnace ◽  
Direct Reduced Iron

scholarly journals Phosphorus Equilibrium Between Liquid Iron and CaO-SiO2-MgO-Al2O3-FeO-P2O5 Slags: EAF Slags, the Effect of Alumina and New Correlation

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 116 ◽  
Author(s):  
Andre N. Assis ◽  
Mohammed A. Tayeb ◽  
Seetharaman Sridhar ◽  
Richard J. Fruehan
Keyword(s):  
Iron Oxide ◽  
Partition Coefficient ◽  
Calcium Oxide ◽  
Liquid Iron ◽  
Slag Composition ◽  
Iron Ore ◽  
Electric Arc ◽  
Arc Furnace ◽  
Direct Reduced Iron ◽  
New Correlation

The increased use of electric arc furnace (EAF) steelmaking using up to 100% direct reduced iron (DRI) has prompted an interest in better control of phosphorus since iron ore and, consequently, DRI have higher phosphorus and silica compared to scrap. There is limited work reported on slag chemistries corresponding to that in the EAF when DRI is used. In the current research, phosphorus equilibria between molten Fe–P alloys and CaO-SiO2-Al2O3-P2O5-FeO-MgOsaturated slags were investigated. The results indicate that there is a significant decrease in the phosphorus partition coefficient (LP) as alumina in the slag increases. The observed effect of alumina on the phosphorus partition is probably caused by the decrease in the activities of iron oxide and calcium oxide. Finally, an equilibrium correlation for phosphorus partition as a function of slag composition and temperature has been developed. It includes the effect of alumina and silica and is suitable for both oxygen and electric steelmaking-type slags.

Role of Direct Reduced Iron Fines in Nitrogen Removal from Electric Arc Furnace Steel

2007 ◽  
Vol 78 (8) ◽  
pp. 588-594 ◽  
Author(s):  
J. Pal ◽  
S. Ghosh ◽  
M. C. Goswami ◽  
D. P. Singh ◽  
Manoj Kumar ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Arc Furnace ◽  
Direct Reduced Iron ◽  
Furnace Steel

Recycling of Electric Arc Furnace Dust by Adding to Hot Metal

2012 ◽  
Vol 727-728 ◽  
pp. 1740-1745
Author(s):  
Vicente de Paulo Ferreira Marques Sobrinho ◽  
José Roberto de Oliveira ◽  
Victor Bridi Telles ◽  
Felipe Fardin Grillo ◽  
Jorge Alberto Soares Tenório ◽  
...  
Keyword(s):  
Electric Arc Furnace ◽  
Particle Size Analysis ◽  
Electric Arc ◽  
Size Analysis ◽  
Pig Iron ◽  
Arc Furnace ◽  
Hot Metal ◽  
Experimental Conditions ◽  
Electric Arc Furnace Dust ◽  
Fusion Experiments

This research aims to study the process of incorporation of the metal iron contained in electric arc furnace dust (EAFD), by addition in hot metal at a temperature of 1,400 degrees Celsius altering experimental conditions such as how to add the EAFD (“as received” and in the form of briquettes), the percentage of EAFD to be added (10, 20 and 30% of initial weight of sample pig iron). The time of withdrawal of the sample of pig iron and slag (30 minutes after the addition of EAFD). Previously, the EAFD will be characterized using the following techniques: chemical analysis, particle size analysis, X-ray diffraction, scanning electron microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) microanalysis. After characterization, the electric arc furnace dust to be added to the bath of liquid iron, will be divided into 2 types: the first order of addition will be in the form "as received" from the plant and the second is through the agglomeration of EAFD in the form of briquettes. The achievement of fusion experiments in laboratory scale will take place in a vertical tubular furnace with temperature control. The fusion experiments to assess the incorporation of the metal iron will use graphite crucibles. A flow of inert gas (argon) will be maintained inside the furnace during the experiments. It is expected that the results obtained at the end of the research allow the evaluation of the iron metal incorporation of electric arc furnace dust in pig iron bath.

scholarly journals Process Improvements for Direct Reduced Iron Melting in the Electric Arc Furnace with Emphasis on Slag Operation

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 402
Author(s):  
Marcus Kirschen ◽  
Thomas Hay ◽  
Thomas Echterhof
Keyword(s):  
Steel Production ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Raw Material ◽  
Steel Scrap ◽  
Process Conditions ◽  
Arc Furnace ◽  
Process Improvements ◽  
Direct Reduced Iron ◽  
Arc Furnaces

Steelmaking based on direct reduced iron (DRI, and its compacted derivative hot briquetted iron, HBI) is an anticipated important global alternative to current steel production based on FeOx reduction in blast furnaces due to its lower specific CO2 emission. The majority of DRI is melted and refined in the electric arc furnace with different process conditions compared to the melting of steel scrap due to its raw material composition being rather different. We provide data and analysis of slag composition of DRI charges vs. steel scrap charges for 16 industrial electric arc furnaces (EAFs). Suggestions for optimized slag operation and resulting process improvements of DRI melting in the EAF are given. A dynamic mass and energy model of the DRI melting in the EAF is introduced to illustrate the implications of the adapted slag operation on the EAF process with DRI charges.

scholarly journals Use of Iron and Steel Slags in Concrete: State of the Art and Future Perspectives

2021 ◽  
Vol 13 (2) ◽  
pp. 556
Author(s):  
Alan Piemonti ◽  
Antonio Conforti ◽  
Luca Cominoli ◽  
Sabrina Sorlini ◽  
Antonella Luciano ◽  
...  
Keyword(s):  
State Of The Art ◽  
Physical And Mechanical Properties ◽  
Electric Arc ◽  
Point Of View ◽  
Pig Iron ◽  
Arc Furnace ◽  
Future Perspectives ◽  
Iron And Steel ◽  
Coarse Aggregates ◽  
Different Types

In the two last decades, world production of pig iron and steel has undergone a significant increase. In 2018, 1252.87 and 1806.46 million tons of pig iron and steel, respectively, were produced as compared to the 575.78 and 809.94 million tons of 2000. Consequently, the amount of the different types of slags deriving from these production processes has also increased considerably. In relation to the principles of sustainability and circular economy, the available literature suggests several possible reuses for these slags (bituminous conglomerates, hydraulic engineering, metallurgy, fertilizers, etc.). This paper aims to provide an overview of the iron and steel slags production and their reuse in concrete (for example as replacement of cement, fine or coarse aggregates). The characteristics of slags are analyzed in terms of chemical, physical, and mechanical properties. Mechanical and durability tests (both from material and structures point of view) carried out in the different studies and research are shown as well. Particular attention was devoted to electric arc furnace slags (EAF) since they are the most produced in Italy. Based on this deep literature review, the gaps that still require further studies have been identified and discussed.

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