The Effect of Presence of SiO2, Al2O3 and P2O5 on the Reduction Behaviour of Fe2O3 Nuggets with Coke Fines

Gupta, Prithviraj; De, Arnab; Biswas, Chanchal

doi:10.1007/s13369-016-2212-5

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…The 6.69% value of LOI indicates that the organic content of the catalyst is low. Literature suggests that the presence of SiO2 and Al2O3 in the structure of the catalyst might actually reduce the apparent activation energy of Fe2O3 which in turn may result in enhancing its catalytic activity [32]. In addition, the presence of silica within the iron catalyst controls the reducibility of Fe2O3 in the reaction, due to the surface variations induced to HRS and interaction between iron and silica [33].…”

Section: Catalyst Characterizationmentioning

confidence: 99%

A continuous-flow catalytic process with natural hematite-alginate beads for effective water decontamination and disinfection: Peroxymonosulfate activation leading to dominant sulfate radical and minor non-radical pathways

Mohammadi

Moussavi

Shekoohiyan

et al. 2021

Chemical Engineering Journal

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Section: Catalyst Characterizationmentioning

confidence: 99%

A continuous-flow catalytic process with natural hematite-alginate beads for effective water decontamination and disinfection: Peroxymonosulfate activation leading to dominant sulfate radical and minor non-radical pathways

Mohammadi

Moussavi

Shekoohiyan

et al. 2021

Chemical Engineering Journal

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“…The thermal decomposition, or calcination, of calcite has been extensively studied. Ratelimiting processes have been defined [1], and the effects of steam [2], pressure [3], CO 2 partial pressure [4], heating rate [5], and impurities [6][7][8], among other parameters, have been identified. Of the proposed calcination mechanisms, a mechanism involving intermediate "activated lime" CaO*(s), originally proposed by Hyatt et al in 1958 [9], has received support in more recent studies [4,10].…”

Section: Introductionmentioning

confidence: 99%

Impact of Limestone Surface Impurities on Quicklime Product Quality

Eriksson,

Sandström,

Carlborg

et al. 2024

Minerals

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Quicklime is produced through the thermal processing of limestone in industrial kilns. During quarry operations, fine particulate quarry dust adheres to limestone lump surfaces, increasing the bulk concentration of impurities in limestone products. During thermal processing in a kiln, impurities such as Si, Mg, Al, Fe, and Mn react with Ca, reducing quicklime product quality. Which reactant phases are formed, and the extent to which these result in a reduction in quality, has not been extensively investigated. The present study investigated as-received and manually washed limestone product samples from two operational quarries using elemental compositions and a developed predictive multi-component chemical equilibrium model to obtain global phase diagrams for 1000–1500 °C, corresponding to the high-temperature zone of a lime kiln, identifying phases expected to be formed in quicklime during thermal processing. The results suggest that impurities found on the surface of the lime kiln limestone feed reduce the main quality parameter of the quicklime products, i.e., calcium oxide, CaO (s), content by 0.8–1.5 wt.% for the investigated materials. The results also show that, in addition to the effect of impurities, the quantity of CaO (s) varies greatly with temperature. More impurities result in more variation and a greater need for accurate temperature control of the kiln, where keeping the temperature below approximately 1300 °C, that of Hatrurite formation, is necessary for a product with higher CaO (s).

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“…En el recorrido bibliográfico que se abarca en este trabajo se ha observado un grado de imprecisión en los términos empleados, circunstancia que ha motivado la presentación de un trabajo en el cual se sistematice nominalmente el mineral y su roca. Esto se considera importante dado que ciertos autores exponen que la dolomita es una mezcla de carbonatos de calcio y magnesio (Badapalli et al, 2022;Carter y Norton, 2007;Darweesh, 2001;Diwan et al, 2020;Gupta y De, 2016;Hossain et al, 2011;Huamayalli y Luna, 1993;Mahadevan, 1945;Shahraki et al, 2009;Yener et al, 2007;Yeprem et al, 2004). En realidad la dolomita es una sustancia con identidad propia con una determinada estructura cristalina, diferente de la calcita y magnesita (Britton et al, 1952).…”

Section: Introduciónunclassified

Dolomía y dolomita: un abordaje desde las perspectivas geológica, cerámica y refractaria

Resio

2023

Tesla rev. cient.

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En el presente trabajo de revisión se propone llevar adelante un análisis de la bibliografía relacionada al mineral dolomítico. El estado del arte de las dolomías indica al presente un uso creciente como material refractario debido a la alternativa más económica que representa en comparación con otros materiales como lo es el óxido de magnesio. La importancia de la dolomía aparte de su aplicación en la industria siderúrgica radica en que se ha expandido a otros campos industriales como lo es la producción de catalizadores, soportes de catalizadores, y materiales de depuración de efluentes industriales. La revisión se ha llevado a cabo extrayendo la síntesis de trabajos de investigación desde 1924 al presente, desde tres perspectivas: geológica, cerámica y refractaria, puesto que las revisiones de dolomía sólo analizan los aspectos refractario o geológico en forma separada. Dado este marco, se hace necesario un documento que agrupe las áreas mencionadas.

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The Effect of Presence of SiO2, Al2O3 and P2O5 on the Reduction Behaviour of Fe2O3 Nuggets with Coke Fines

Cited by 4 publications

References 8 publications

A continuous-flow catalytic process with natural hematite-alginate beads for effective water decontamination and disinfection: Peroxymonosulfate activation leading to dominant sulfate radical and minor non-radical pathways

A continuous-flow catalytic process with natural hematite-alginate beads for effective water decontamination and disinfection: Peroxymonosulfate activation leading to dominant sulfate radical and minor non-radical pathways

Impact of Limestone Surface Impurities on Quicklime Product Quality

Dolomía y dolomita: un abordaje desde las perspectivas geológica, cerámica y refractaria

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