Development of Cold Bonded Chromite Pellets for Ferrochrome Production in Submerged Arc Furnace

Dwarapudi, Srinivas; Tathavadkar, Vilas; Рао, Б. Л. С. Пракаса; Kumar, T. K. Sandeep; Ghosh, Tamal; Denys, M.

doi:10.2355/isijinternational.53.9

Cited by 23 publications

(12 citation statements)

References 3 publications

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“…Effective SAF smelting operation requires a permeable burden to ensure the uniform flow of reduction gases and smooth furnace operation (Dwarapudi et al, 2013). The use of fine chromite ore in SAFs is limited, since fine materials increase the tendency of the surface layer of the SAF burden to sinter.…”

mentioning

confidence: 99%

Techno-economic feasibility of a pre-oxidation process to enhance prereduction of chromite

Kleynhans

Beukes

Zyl

et al. 2017

J. South. Afr. Inst. Min. Metall.

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mentioning

confidence: 99%

Techno-economic feasibility of a pre-oxidation process to enhance prereduction of chromite

Kleynhans

Beukes

Zyl

et al. 2017

J. South. Afr. Inst. Min. Metall.

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“…5 To satisfy the demands of iron-chromium alloys, a lot of research has been focused on the use of low grade chromite ores, not only for energy savings, but also to optimise the reduction process, especially those which use melting and reduction with an arc electric furnace. [6][7][8][9] Takano et al 10 obtained high content carbon iron-chromium alloys by carbothermic reduction of chromite pellets at 1500°C under argon atmospheres. The mechanism of reduction they proposed consisted in two stages: the first stage was the reaction between CO and chromite, while the second stage was carried out after the slag formation, where the reduction process slowed down.…”

Section: Introductionmentioning

confidence: 99%

Kinetic study on the metallothermic reduction of chromite ore using magnesium scrap

Ochoa¹,

Flores²,

Torres³

et al. 2016

Canadian Metallurgical Quarterly

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A study on the metallothermic reduction of chromite ore is presented and discussed, using magnesium scrap as reducing agent. Microstructural analysis corroborated the distribution of phases inside the particles, where Fe and Cr were located at the centre surrounded by layers of reaction products, mainly MgO. The maximum conversion efficiency of Fe and Cr was 38% at 1050°C, after a reaction time of 3 hours, using 75% excess of magnesium scrap. A kinetic study was performed fitting the experimental data to available kinetic models, where the data adjusted to the chemical reaction model, especially at the beginning of reaction. A second reaction stage was confirmed once the experimental data was adjusted to the Jander diffusion model. For the chemical reaction model, the constant rate and the activation energy were 0.32 h −1 and 60.12 kJ mol −1 , respectively. For the diffusion model, the rate constant was 0.20 h −1 and the activation energy 47.04 kJ mol −1 .On présente et discute d'une étude de la réduction métallothermique du minerai de chromite, utilisant des rebuts de magnésium comme agent réducteur. L'analyse de la microstructure a corroboré la distribution des phases dans les particules, où le Fe et le Cr étaient situés au centre et entourés par des couches de produits de réaction, principalement du MgO. Le rendement maximal de la conversion du Fe et du Cr était de 38% à 1050°C, après une durée de réaction de trois heures, en utilisant un excès de 75% de rebuts de magnésium. On a effectué une étude cinétique, ajustant les données expérimentales aux modèles cinétiques disponibles, où les données étaient ajustées au modèle de réaction chimique, spécialement au début de la réaction. On a confirmé une seconde étape de réaction, après ajustement des données expérimentales au modèle de diffusion de Jander. Pour le modèle de la réaction chimique, la constante cinétique et l'énergie d'activation étaient de 0.32 h −1 et de 60.12 kJ mol −1 , respectivement. Pour le modèle de diffusion, la constante cinétique était de 0.20 h −1 et l'énergie d'activation, de 47.04 kJ mol −1 .

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“…Among the impurities, iron is one of the gangue element, which is present in the form of gangue minerals as well as in the chromite crystal lattice. It is well reported in the literature that the chromium-to-iron ratio (Cr:Fe ratio) of chromite ores plays a crucial role in the efficiency of ferrochrome production [1][2][3]. For removal of the gangue minerals, including iron-bearing minerals, beneficiation is mandatory prior to the smelting process [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods

et al. 2019

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The low chromium‐to‐iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium content. In the present study, a chromite concentrate was reprocessed by gravity (spiral concentrator) and magnetic separation to enhance the chromium‐to‐iron ratio. Also, detailed characterization studies including automated mineralogy were carried out to better understand the nature of the samples. Enhancing the chromium‐to‐iron ratio was achieved by using advanced spiral separators which will be discussed in this paper.

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Development of Cold Bonded Chromite Pellets for Ferrochrome Production in Submerged Arc Furnace

Cited by 23 publications

References 3 publications

Techno-economic feasibility of a pre-oxidation process to enhance prereduction of chromite

Techno-economic feasibility of a pre-oxidation process to enhance prereduction of chromite

Kinetic study on the metallothermic reduction of chromite ore using magnesium scrap

Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods

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