Kinetic reduction of mill scale via hydrogen

Gaballah, N. M.; Zikry, A. F.; Khalifa, M.G.; Farag, A.B.; El-Hussiny, N.A.; Shalabí, M. E. H.

doi:10.2298/sos1401107g

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…Gaballah et. al, [13], reporta la presencia de los mismos óxidos de hierro además de cuarzo y hierro metálico para una cascarilla de laminación procedente de plantas egipcias. [14].…”

Section: Grado De Conversión Metálicaunclassified

Conversion Termoquímica Y Análisis Microestructural De Briquetas Auto-Reductoras Hechas De Cáscarilla Resultante De La Laminación Proveniente Del Proceso De Conformado Del Acero en Caliente (Mill Scale), Y Grafito Reciclado

Urday¹,

Valdivia²,

Chávez³

2020

Rev. Bol. Quim.

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Este artículo presenta los resultados de la investigación sobre reciclado de la cascarilla resultante de la laminación proveniente del proceso de conformado del acero en caliente, con el fin de explorar la posibilidad de obtener hierro esponjoso con un alto contenido metálico. La experimentación consistió en formar briquetas auto-reductoras mezclando óxido de hierro y grafito llevándolas a un proceso de auto-reducción variando la temperatura de 900 a 1050ºC por el lapso mínimo de 30 min. extensible a 90 min., dependiendo del caso. La cascarilla y los productos reducidos obtenidos fueron caracterizados aplicando técnicas de análisis mineralógico mediante fluorescencia y difracción de rayos X, y de composición química mediante microscopía electrónica de barrido (SEM). En los productos reducidos, se determinó la cantidad de masa perdida y el cambio en la proporción de peso real. Adicionalmente, la determinación del grado de conversión metálica fue posible mediante la técnica analítica del análisis del Fe metálico y Fe total para cada muestra. Los resultados mostraron que en las condiciones: [90 min – 1050ºC - 13% de grafito, se alcanza un grado de conversión metálica igual al 99.9%], y para [30 min – 1050ºC - 20.7% de grafito, un 95% de conversión metálica se observa] y para [90 min – 1050ºC - 20.7% de grafito, un 94.4% de conversión metálica se observa]. Para el caso del máximo grado de conversión metálica, se pudo observar la formación de hierro a partir del coalescimiento de puntos metálicos (whiskers) que conlleva a crear fases densas y compactas.

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“…Gaballah et. al, [13], reporta la presencia de los mismos óxidos de hierro además de cuarzo y hierro metálico para una cascarilla de laminación procedente de plantas egipcias. [14].…”

Section: Grado De Conversión Metálicaunclassified

Conversion Termoquímica Y Análisis Microestructural De Briquetas Auto-Reductoras Hechas De Cáscarilla Resultante De La Laminación Proveniente Del Proceso De Conformado Del Acero en Caliente (Mill Scale), Y Grafito Reciclado

Urday¹,

Valdivia²,

Chávez³

2020

Rev. Bol. Quim.

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“…This may be due to the fact that increasing the pressure leads to an increase in the briquette compaction which leads to an increase in the inherent Van der Waals forces present [20][21]. As well, increasing the pressure load may have progressively crushed and decrease the macro pores present within the briquettes [20][21][22].…”

Section: The Effect Of Pressure On the Physical Properties Of The Pro...mentioning

confidence: 99%

“…The increase in flow rate may increase the gas diffusion across the boundary layer increasing the rate of the reaction [21,22,24]. This may attributed to the fact that increasing the flow rate leads to the increase in the number of hydrogen moles passing through the bulk phase, which in turn leads to an increase in hydrogen adsorption onto the briquette material.…”

Section: The Effect Of Hydrogen Flow Rate Upon the Reduction Of E/o M...mentioning

confidence: 99%

“…As well, there was a decline in diffusion resistance, as H 2 becomes a dominating factor. On the other hand, the prevailing increase in flow rate in the reaction zone enhances the rate of hydrogen absorption and subsequently the rate of chemical reaction increases [21,22,24,25]. Moreover, it was indicated that hydrogen had a role in improving the increasing of the rate constant that may be attributed to the endothermic reaction of hydrogen reduction [23].…”

Section: The Effect Of Hydrogen Flow Rate Upon the Reduction Of E/o M...mentioning

confidence: 99%

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The Effect of Adding El-Dekhilla Waste Pellets Upon The Quality and Reduction Kinetics of El-Baharia Iron Ore Briquettes Using Hydrogen Gas

El-Dars,

Salah,

Elsaby

et al. 2017

The Bulletin Tabbin Institute for Metallurgical Studies (TIMS)

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The effect of the addition of El-Dekhilla waste pellets fines (E) upon the quality of El-El-Baharia iron ore (O) briquettes was investigated in this study. The kinetics of the reduction of the briquettes formed having different composition using hydrogen gas was studied at different temperatures (700°C-950°C). The results indicated that best ore reduction was achieved at 950°C. The kinetic of the reduction process was studied using different models and the best-fit models determined was (Kt = 1-(1-R) 1/2 and kt = R+ (1-R) ln (1-R)). XRD analysis was used to identify the main crystalline phases present within the reduced briquettes at the optimal temperature and it was found that the metallic iron (syn. Fe) was predominantly formed.

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“…These factors are affected by the process temperature, the chemical composition of the materials used and their softening point, the electrical resistivity of the charge, the reducibility of the materials, and the types of reducing agents used. In [15], the kinetic reduction briquettes obtained from mill scale is carried out with hydrogen. As a result, it is shown that the recovery process is controlled by the process diffusion, and the activation energy ranges from 61.5 to 72.25 kJ/mol.…”

Section: Introductionmentioning

confidence: 99%

Study of the isothermal kinetics of reduction of sinter from mill scale

Zhunussov,

Bykov,

Kenzhebekova

et al. 2023

KIMS/CUMR/MShKP

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Studies of the isothermal kinetics of the reduction of sinter from mill scale were carried out at Zh. Abisheva Chemical and Metallurgical Institute (Karaganda). The influence of temperature and heating time on the degree of reduction of iron and other elements was studied in the Tamman furnace by the thermogravimetric method. The amount of reducing agent was taken in the experiments based on the stoichiometrically necessary amount of carbon for the complete reduction of iron oxides by more than 60%, as well as for the carburization of the resulting metal to 2.0% C. To obtain the kinetic characteristics of the reduction of the studied materials, depending on the temperature and duration of the process, processing of the received data array according to the models developed especially for these cases. The results of experimental data processing according to the Gistling-Brownstein model are presented. As a general assessment, this model with a sufficiently high correlation (R not less than 0.9) describes the studied process, which confirms its diffusion character. Analyzing the calculated data of the activation energy, one can assume the diffusion nature of the inhibition of the reduction reaction of all the materials under study. The value of the activation energy of the process shows that the agglomerate with dolomite (fluxed agglomerate) has the highest reducibility. During the frontal reduction of oxides of iron and other elements with carbon, a slag shell is formed around the grains of materials, which consists mainly of acidic oxides of barren rock, non-metallic inclusions of lightweight scrap and reducing agent ash and has a high viscosity. Its thickness depends on the composition of the material, temperature, time and degree of reduction.

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Kinetic reduction of mill scale via hydrogen

Cited by 7 publications

References 7 publications

Conversion Termoquímica Y Análisis Microestructural De Briquetas Auto-Reductoras Hechas De Cáscarilla Resultante De La Laminación Proveniente Del Proceso De Conformado Del Acero en Caliente (Mill Scale), Y Grafito Reciclado

Conversion Termoquímica Y Análisis Microestructural De Briquetas Auto-Reductoras Hechas De Cáscarilla Resultante De La Laminación Proveniente Del Proceso De Conformado Del Acero en Caliente (Mill Scale), Y Grafito Reciclado

The Effect of Adding El-Dekhilla Waste Pellets Upon The Quality and Reduction Kinetics of El-Baharia Iron Ore Briquettes Using Hydrogen Gas

Study of the isothermal kinetics of reduction of sinter from mill scale

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