Effect of Bath Environment and Charge Material on the Removal of Impurities from the Pig Iron Melt Using Laboratory Scale (2 kg) Electric Arc Furnace

2022 ◽  
Author(s):  
Raj Kumar Dishwar ◽  
Shavi Agrawal ◽  
Amit Kumar Singh ◽  
O. P. Sinha
Keyword(s):  
Charge Material ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Laboratory Scale ◽  
Pig Iron ◽  
Arc Furnace ◽  
Removal Of Impurities

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.

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 Minimizing Chromium Leaching from Low-Alloy Electric Arc Furnace (EAF) Slag by Adjusting the Basicity and Cooling Rate to Control Brownmillerite Formation

2019 ◽  
Vol 10 (1) ◽  
pp. 35
Author(s):  
Ida Strandkvist ◽  
Kjell Pålsson ◽  
Anton Andersson ◽  
Jenny Olofsson ◽  
Andreas Lennartsson ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Full Scale ◽  
Laboratory Scale ◽  
Scale Production ◽  
Arc Furnace ◽  
Cooling Process ◽  
Rate Of Cooling ◽  
Eaf Slag

Brownmillerite is connected to chromium leaching when present in steel slags. To prevent chromium leaching, brownmillerite in slag should be prevented. Two methods for decreasing brownmillerite content in low-alloy electric arc furnace (EAF) slag were investigated: decreasing the basicity and increasing the cooling rate. The methods were tried on both laboratory scale and in full-scale production. In the laboratory scale experiments, chromium leaching decreased as the basicity decreased until brownmillerite was no longer present, slower cooling resulted in increased chromium leaching, and faster cooling decreased chromium leaching. In full-scale production, basicity modified single batches, with a basicity below 2.2, generally leached less chromium than slag batches with higher basicity, thus verifying the correlation between basicity and chromium leaching seen in laboratory scale experiments. The cooling process in the full-scale experiments was achieved either by letting the slag cool by itself in the air or by water spraying. The water-sprayed slag, which cooled faster, had less chromium leaching than the air-cooled slag. The full-scale production experiments confirmed that both decreasing basicity below 2.2 and increasing the rate of cooling could be used to decrease chromium leaching.

The Study of Additive Variation in Smelting Process of Sponge Iron into Pig Iron on the Fe Content and Fe Recovery Using Electric Arc Furnace

2019 ◽  
Vol 964 ◽  
pp. 55-61
Author(s):  
Sungging Pintowantoro ◽  
Fakhreza Abdul ◽  
Imam Prasetyo ◽  
Angga Dharma
Keyword(s):  
Steel Production ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Sponge Iron ◽  
Smelting Process ◽  
Pig Iron ◽  
Arc Furnace ◽  
Production Chain ◽  
Iron Smelting ◽  
Fe Content

Iron sand as the largest form of iron ore reserves in Indonesia has not been optimized properly for domestic iron-steel production. In the production chain of pig iron from iron sand, there is a problem that in sponge iron (result of direct reduction) contains many impurities, especially titanium. This research is conducted to determine the effect of additive variation to the Fe content and Fe recovery during sponge iron smelting process into pig iron using electric arc furnace (EAF). Types of additives variation that used in this research are CaCl2 and CaC2, as well as smelting without additive as comparison. Briquettes made from sponge iron, coal, flux (SiO2), and variations of additive are melted in crucible using EAF (16.2 Volt; 180 Ampere) for 6 minutes. Based on EDX and XRD results of pig iron and slag, the optimum process of sponge iron smelting is use the CaCl2 as additive. It’s shown by the result that the pig iron containing the highest %wt Fe by 90.97% and the highest Fe recovery by 80.41%. The product that used CaC2 as additive has Fe content of 89.31 %wt and Fe recovery during process of 72.36%. Meanwhile, the results obtained from the smelting without additives only shows that the Fe content in pig iron amounted to 88.90 %wt and 68.76% values for Fe Recovery.

scholarly journals Sedimentation of Copper Droplets after their Coagulation and Growth. Laboratory Scale

2016 ◽  
Vol 16 (1) ◽  
pp. 95-98 ◽  
Author(s):  
W. Wołczyński ◽  
A.W. Bydałek
Keyword(s):  
Reduction Process ◽  
Solidification Process ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Laboratory Scale ◽  
The Other ◽  
Arc Furnace ◽  
Coagulation Process ◽  
Other Hand

Abstract The suspension of copper droplets in the slag is considered. The copper/slug suspension is delivered as the product from the direct-to-blister process which is applied in the KGHM – Polska Miedź (Polish Copper) S.A. factory. The droplets / slag suspension was treated by a special set of reagents (patented by the authors) to improve the coagulation process. On the other hand, the observations are made to estimate if the melting / reduction process in the furnace is sufficiently effective to avoid a remaining of carbon in the copper droplets. The coagulation process was carried out in the crucible (laboratory scale). However, conditions imposed to the coagulation / solidification process in the laboratory scale were to some extent similar to those applied usually in the industry when the suspension is subjected to the analogous treatment in the electric arc-furnace. Some suggestions are formulated how to improve the industrial direct-to-blister process.

Analytical Electron Microscopy Characterization of Electric Arc Furnace Dust

1981 ◽  
Vol 39 ◽  
pp. 134-135
Author(s):  
J. R. Porter ◽  
J. I. Goldstein ◽  
D. B. Williams
Keyword(s):  
Electron Microscopy ◽  
Analytical Electron Microscopy ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Dust Particles ◽  
Particle Analysis ◽  
Arc Furnace ◽  
Analytical Electron ◽  
Residual Elements ◽  
Industry Practice

Alloy scrap metal is increasingly being used in electric arc furnace (EAF) steelmaking and the alloying elements are also found in the resulting dust. A comprehensive characterization program of EAF dust has been undertaken in collaboration with the steel industry and AISI. Samples have been collected from the furnaces of 28 steel companies representing the broad spectrum of industry practice. The program aims to develop an understanding of the mechanisms of formation so that procedures to recover residual elements or recycle the dust can be established. The multi-phase, multi-component dust particles are amenable to individual particle analysis using modern analytical electron microscopy (AEM) methods.Particles are ultrasonically dispersed and subsequently supported on carbon coated formvar films on berylium grids for microscopy. The specimens require careful treatment to prevent agglomeration during preparation which occurs as a result of the combined effects of the fine particle size and particle magnetism. A number of approaches to inhibit agglomeration are currently being evaluated including dispersal in easily sublimable organic solids and size fractioning by centrifugation.

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