Direct mineralogical composition of a MgO-C refractory material obtained by Rietveld methodology

Torre, Ángeles G. De la; Valle, F. J.; Aza, Antonio H. De

doi:10.1016/j.jeurceramsoc.2005.05.005

Cited by 23 publications

(6 citation statements)

References 32 publications

(32 reference statements)

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“…De Aza y col [19], utilizando esta estrategia, abordaron el análisis químico completo de un material de magnesiagrafito y para ello realizaron los análisis químicos por ICP-OES. En un artículo posterior abordaron el análisis global del material utilizando conjuntamente los resultados del análisis químico y los obtenidos mediante difracción de rayos X utilizando la técnica de Rietveld [20].…”

Section: Introductionunclassified

Caracterización química y mineralógica de refractarios de Al2O3-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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Section: Introductionunclassified

Caracterización química y mineralógica de refractarios de Al2O3-MgO-C

Ortega¹,

Velasco²,

Muñoz³

et al. 2012

Bol. Soc. Esp. Ceram. Vidr.

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“…Furthermore, these results have been verified and validated with those obtained for the crystalline phases present in the material by X-ray powder diffraction combined with the Rietveld methodology. 43 Therefore, the accuracy of both methodologies has been also reciprocally confirmed.…”

Section: (5) Chemical Analysismentioning

confidence: 79%

Analytical Characterization of a Magnesia–Graphite Refractory

Aza

Valle

Ortega

et al. 2006

Journal of the American Ceramic Society

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Magnesia-graphite refractories are currently essential for the iron and steel industry. As a result, their physico-chemical characterization is crucial with a view to predicting their service life. In this work, a methodology for the complete analytical characterization of such materials has been developed. Magnesiagraphite refractories generally contain elemental phases (C, Si, and Al), non-oxide and oxide inorganic phases (SiC, MgO, and Al 2 O 3 ), organic phase (binders), and various additives and impurities. Consequently, their chemical characterization is especially difficult and requires the joint use of the following techniques: X-ray diffraction, differential thermal and thermogravimetric analyses, inductively coupled plasma-atomic emission spectroscopy, flame emission, Fourier transform infrared spectrometry, gravimetry, and C/S elemental analyzer (LECO). The data obtained by the different techniques match satisfactorily and provide validity to the methodology developed. The results obtained for each element analyzed, and the precision of each determination method used, are quite acceptable. J ournal

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“…Table 2 shows the change in percentage of periclase phase with sintering temperature. Rietveld refinement analysis helps us in determining how the observed values fit with the theoretical values [5] [6]. Rietveld method is a full-pattern fit method.…”

Section: Mineralogical Propertiesmentioning

confidence: 99%

Studies on Synthesis and Characterization of Magnesia Based Refractory Aggregates Developed from Indian Magnesite

Haldar¹,

Ghosh²,

Ghosh³

2014

MSCE

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The present work intends to study the properties of magnesia based refractory aggregates developed from Indian magnesite by changing lime/silica ratio. The material has been sintered in the temperature range of 1550˚C -1700˚C. The sintered samples are characterized in terms of bulk density, apparent porosity, true density, percentage densification, mechanical, thermo-mechanical properties like cold modulus of rupture, hot modulus of rupture and thermal shock resistance and structural properties by XRD. The developed microstructures at different temperatures are studied through FESEM study and compositional analysis of the developed phases is done by EDX study.

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Direct mineralogical composition of a MgO-C refractory material obtained by Rietveld methodology

Cited by 23 publications

References 32 publications

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

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

Analytical Characterization of a Magnesia–Graphite Refractory

Studies on Synthesis and Characterization of Magnesia Based Refractory Aggregates Developed from Indian Magnesite

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