Modelling of ferrosilicon smelting in submerged arc furnaces

Batra, Neera

doi:10.1179/030192303225004088

Cited by 14 publications

(13 citation statements)

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“…Silicon monoxide is usually assumed to form from coke ash and ash from injectants as a result of any of the following reactions [5][6][7][8]10,12,13,[15][16][17]19,20,[22][23][24] : SiO 2 (in ash)ϩCO (g)ϭSiO (g)ϩCO 2 Usually reaction (2) is given as the dominating reaction 5,6,12,13,[15][16][17]20,[22][23][24] Some sources also give reaction (1) as the dominating reaction. 7,8,10) The difference between reactions (1) and (2) is Boudouard's reaction: C (graphite, coke or coal powder)ϩCO 2 (g)ϭ2CO (g)... (5) If reaction (1) occurs, the CO 2 gas formed will react with carbon (from coke or injectants) according to reaction (3) resulting in the net reaction (2).…”

Section: Theoretical Considerationsmentioning

confidence: 99%

A Thermodynamic Study of Silicon Containing Gas around a Blast Furnace Raceway

2005

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Section: Theoretical Considerationsmentioning

confidence: 99%

A Thermodynamic Study of Silicon Containing Gas around a Blast Furnace Raceway

2005

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“…The molten alloy is atomized, dried, and screen classified into various grades of atomized FeSi powders . On the other route, carbothermic reduction of quartz to silicon using coke or coal is carried out in the presence of molten iron in electric arc furnace (EAF) . The EAF charge composition is such that the silicon is dissolved in the molten iron to the 14% to 16% Si target composition for DMS FeSi.…”

Section: Introductionmentioning

confidence: 99%

“…1,[4][5][6][7] On the other route, carbothermic reduction of quartz to silicon using coke or coal is carried out in the presence of molten iron in electric arc furnace (EAF). [8][9][10][11][12] The EAF charge composition is such that the silicon is dissolved in the molten iron to the 14% to 16% Si target composition for DMS FeSi. The molten product is tapped, granulated, milled, and screened to desired powder size ranges.…”

Section: Introductionmentioning

confidence: 99%

Understanding hydrophobicity variations in dense medium ferrosilicon from different production routes

Otunniyi

Oluokun

2019

Surface & Interface Analysis

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Dense medium ferrosilicon (FeSi) powders produced via submerged arc furnace smelting, granulation, and milling route show varying hydrophobicity, sometimes totally nonwetting, amounting to production losses. This does not occur in powders produced via induction furnace smelting and atomization. Although wetting is fundamentally a surface phenomenon, bulk property can dictate surface behavior. Hence, for detailed insight into the cause of the variation, particles of powders from different production routes were studied from surface to the core. Particle shapes differ clearly for the two production routes, but this was found inconsequential to the wetting behavior. Rather, size distribution, proportion of ultra‐fine particles in the powder, was seen to have effect, being more in the nonwetting sample. From the optical microscopy: in the granular particles (that is, before milling), it is visible that different phases formed from the Fe‐Si‐C system, and this will impact milling differently; particles from nonwetting milled powders show a notable surface layer, and in contrast, the atomized particles show more homogeneous equiaxed grains. From X‐ray photoelectron spectroscopy, argon ions sputtering, and depth composition profiling, graphitic carbon (C1s at 284.5 eV binding energy) was found on the surface for all samples at levels above bulk alloy composition but highest (65%) for the totally nonwetting sample. From these pointers, graphite coating on particles is responsible for varying hydrophobicity. Carbon affects solid FeSi microstructure, milling, and powder properties. Controlling carbon content from the smelting stands out for avoiding milled FeSi hydrophobicity. This is however not a straight forward minimization problem.

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“…(e.g. Batra, 2003;Slizovskiy & Tangstad, 2010;Tang & Olsen, 2004) Concerning the modelling of these processes, it is necessary -as it is in the production of ferrochrome -to know the influence of the electric current on the physical and chemical properties and phenomena within the furnace. In the thermodynamic modelling of the ferroalloys production systems, the most important phases to be modelled are the liquid slag and the metal alloy itself (Tang & Olsen, 2004).…”

Section: Saf In the Production Of Other Ferroalloysmentioning

confidence: 99%

“…On the other hand, the formation of SiO-gas my decrease the silicon yield in higher temperatures. (Batra, 2003) In the modelling of the ferromanganese production, one also has to consider the influences of potassium and zinc compounds that are always present in the raw materials. The concentrations of these elements may increase in the furnace due to circulation phenomenon and hence lead to problems such as coke particle disintegration, formation of hard bank materials and irregular flows in the furnace.…”

Section: Saf In the Production Of Other Ferroalloysmentioning

confidence: 99%