The influence of in situ spinel formation on microstructure and phase evolution of MgO–C refractories

Bavand-vandchali, M.; Golestani‐Fard, F.; Sarpoolaky, H.; Rezaie, Hamid Reza; Aneziris, Christos G.

doi:10.1016/j.jeurceramsoc.2007.07.009

Cited by 56 publications

(30 citation statements)

References 14 publications

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“…The suppressed penetration of slag could be partly due to the improvement of the microstructure of the substrate, since the decreased porosity by spinel bonding could lead to the reduction of sucking pressure. [13] The presence of Al 2 O 3 in the spinel phase plays another important role in improving the penetration resistance. This role is evidently brought out by the variation of phases in different zones of the reacted substrate, MS2 (even MS1).…”

Section: B Effect Of Colloidal Alumina Additionmentioning

confidence: 99%

“…Goto and coworkers [11] have found that CaO-Al 2 O 3 -SiO 2 slag penetrated into MgO-MgOAEAl 2 O 3 spinel bricks could lead to the formation of secondary spinel, CaMgSiO 4 , Ca 3 MgSi 2 O 8 , and MgO as microscopic corrosion products. Recently, aluminum oxide as an addition was added into MgO-C refractory by Ganesh et al [12,13] They found that refractories containing in situ spinel improved ceramic bonding and corrosion resistance. Some studies [14][15][16] have also been conducted to investigate the corrosion mechanism in the MgO-Al 2 O 3 refractories.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

Wang

Glaser

Sichen

2015

Metall Mater Trans B

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MgO-in situ spinel substrate was prepared at 1773 K (1500°C) using colloidal alumina suspension and coarse MgO as raw materials. While the addition of 10 mass pct colloidal alumina had limited effect, addition of 20 mass pct colloidal alumina into the MgO matrix improved greatly the resistance of the substrate against the slag penetration at 1873 K (1600°C). The improvement was found to be mainly related to the formation of solid phases, CaOAEAl 2 O 3 and CaOAEMgOAEAl 2 O 3 at the grain boundaries due to slag-spinel reaction. Putting the reacted substrate into contact again with new slag revealed no appreciable new slag penetration. The results showed a potential solution to improve the resistance of MgO-based refractory to slag penetration and to improve steel cleanness.

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Section: B Effect Of Colloidal Alumina Additionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

Wang

Glaser

Sichen

2015

Metall Mater Trans B

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“…Durante la utilización de estos materiales, tienen lugar reacciones que involucran al corindón, la periclasa y el aluminio, fundamentalmente en la fracción fina, que dan lugar a la formación de espinela (MgAl 2 O 4 ) por diversos mecanismos (14)(15)(16)(17). Esta reacción está acompañada de procesos de expansión que pueden contrarrestar el desgaste en las juntas entre los ladrillos refractarios.…”

Section: Introductionunclassified

Caracterización química y mineralógica de refractarios de Al<sub>2</sub>O<sub>3</sub>-MgO-C

Ortega¹,

Velasco²,

Muñoz³

et al. 2012

Bol. Soc. Esp. Ceram. Vidr.

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Los refractarios de Al 2 O 3 -MgO-C, de gran interés tecnológico por sus excelentes propiedades, se utilizan mayoritariamente en las industrias del hierro y el acero. Estos materiales están constituidos por distintas calidades de corindón, periclasa y grafito a los que se añaden pequeñas cantidades de metales y un polímero que actúa como ligante. En este trabajo establece una metodología para la caracterización química y mineralógica de refractarios de Al 2 O 3 -MgO-C. Los resultados del análisis químico realizado por fluorescencia de rayos X, espectroscopia de emisión de plasma y gravimetría, junto con la información cualitativa acerca de las fases cristalinas (obtenida por difracción de rayos X), y el conocimiento de las materias primas con las que están formulados (obtenido por análisis térmico diferencial y termogravimétrico y microscopia óptica de luz reflejada), se han utilizado para conocer la composición de los refractarios. Los datos obtenidos por las diferentes técnicas dan validez a la metodología desarrollada. Palabras clave: refractarios Al 2 O 3 -MgO-C, microscopia óptica, difracción de rayos X, fluorescencia de Rayos X, espectroscopia de emisión de plasma. Chemical analysis of Al 2 O 3 -MgO-C refractoriesThe Al 2 O 3 -MgO-C refractories, of great technological interest for its excellent properties, are used in a wide range of furnacelining applications such as iron and steel. These materials are composed of various grades of alumina, magnesia, graphite and metallic additives, which are added to a resin that acts as binder. The variety of components oxides, metals and polymers makes the study of these refractories a complex task. Considering this diversity to characterize these materials has been used several techniques: X-ray fluorescence, plasma emission spectroscopy and gravimetry, complemented by X-ray diffraction, differential thermal analysis and thermogravimetry and reflected light optical microscopy. This paper provides a methodology for chemical and mineralogical characterization of these refractory materials. The results of chemical analysis together with the qualitative information on the crystalline phases and the raw materials with which they are formulated have been used to quantify the composition of the refractories using rational analysis. The data obtained by the different techniques validate the methodology developed. Vol 51, 6, 305-312, Noviembre-Diciembre 2012 ISSN 0366-3175. eISSN 2173-0431. doi: 10.3989/cyv.422012 Keywords: Al 2 O 3 -MgO-C refractories, optical microscopy, X-ray diffraction , X-ray fluorescence, plasma emission spectroscopy. Boletín de la Sociedad Española de Cerámica y Vidrio INTRODUCCIÓNDesde los años 80, los refractarios de MgO-C y de Al 2 O 3 -MgO-C (AMC) (1-7) se utilizan cada vez más frecuentemente en las industrias del hierro y el acero, lo que ha dado lugar a una significativa mejora en los procesos metalúrgicos. Más específicamente, los ladrillos de MgO-C se usan como revestimiento en los hornos eléctricos de arco y en línea de escoria de las cuchara...

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“…[18,19] In recent years the composition of high-duty MgO-C bricks has been improved, especially in terms of the binders and additives used for better thermo-mechanical properties under ecological and economical aspects. By using artificial resins -as alternative environmental friendly products against tar pitch bonded products -a higher isotropic glassy phase with lower oxidation resistance and more brittle bonding is obtained.…”

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confidence: 99%

Reactive Filters for Steel Melt Filtration

et al. 2012

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There exists an increasing pressure on the metal-making and metal-using industry to remove solid and liquid inclusions such as deoxidation products (oxides), sulfides, nitrides carbides, etc. and thereby improve metal cleanliness. It is well known that size, type, and distribution of non-metallic inclusions in metal decrease dramatically the mechanical properties and especially the fracture toughness, the tensile strength, the ductility as well as the fatigue of the cast products resulting to excessive casting repairs or rejected castings. [1] In case of the oxide inclusions in steel melts, Wasai et al. [2] assigned the dendritic, maple-like and polygonal inclusions to the group of the primary inclusions generated directly after adding aluminum in the metal melt. In contrast, the network-like, coral-like, and spherical inclusions, which are composed of alumina, hercynite, and wü stite, are classified as secondary inclusions. The secondary inclusions are formed due to the lower solubility of oxygen in the melt as a function of the temperature above the liquidus temperature of the melt. In case of the secondary inclusions, the a-, g-, and d-alumina modification are more frequently detected in steel melts. Below the liquidus temperature tertiary and quartenary inclusions are generated that present the highest impact on fractures toughness of steel casts according to Ovtchinnikov. [3]

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The influence of in situ spinel formation on microstructure and phase evolution of MgO–C refractories

Cited by 56 publications

References 14 publications

Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

Caracterización química y mineralógica de refractarios de Al<sub>2</sub>O<sub>3</sub>-MgO-C

Reactive Filters for Steel Melt Filtration

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