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http://repositorio.ufc.br/handle/riufc/58042
Tipo: | Artigo de Evento |
Título : | Tundish slag capacity to absorb inclusions when using calcium aluminate based covering material combined with rice hull ash |
Título en inglés: | Tundish slag capacity to absorb inclusions when using calcium aluminate based covering material combined with rice hull ash |
Autor : | Pereira, Márcia Maria da Silva Monteiro Lima, Marco Túlio Dias Ferreira, Gérson Tolentino Tavernier, Hervé Klug, Jeferson Leandro Heck, Nestor Cezar Jung, Detlef |
Palabras clave : | Escória de Tundish;Materiais de cobertura de tanques;Aluminato de cálcio;Cinza da casca de arroz;Absorção |
Fecha de publicación : | 2016 |
Editorial : | ABM Week - https://abmproceedings.com.br/; Editora Blucher |
Citación : | PEREIRA, Márcia Maria da Silva Monteiro; LIMA, Marco Túlio; FERREIRA, Gérson Tolentino; TAVERNIER, Hervé; KLUG, Jeferson Leandro; HECK, Nestor Cezar; JUNG, Detlef. Tundish slag capacity to absorb inclusions when using calcium aluminate based covering material combined with rice hull ash. In: STEELMAKING SEMINAR - INTERNATIONAL, 47º., 26 a 30 set. 2016, Rio de Janeiro, RJ, Brazil. Anais[...], Rio de Janeiro, p. 546-551, 2016. |
Resumen en portugués brasileño: | Tundish is the last reactor where significant metallurgical operations can still be done. Calcium aluminate slags are able to positively contribute to metallurgy considering oxide separation, protection against reoxidation and preclusion of resulphurisation. However, these are poor insulators. When using low melting point slags it is necessary to use another covering material. The deviation from saturation can be used as a measure of absorption capacity. By utilizing computerized construction of ternary and quaternary diagrams it is possible to compare different slags and to find proper slag compositions with reasonable capacity to dissolve inclusions. Objective of the present technical contribution is to evaluate tundish slag capacity to absorb inclusions, considering a particular tundish industrial slag and the changes in its chemical composition during continuous casting of steel. It was observed that slag composition changed during the continuous casting process; this variation is possibly related to interaction between the CaO-Al2O3 liquid slag and the rice hull ash layer which is used above it. Computational thermodynamics was used to determine activity of alumina dissolved in liquid slag; it was observed that the variation in slag composition did not change slag capacity to absorb inclusions, since precipitation of Al2O3 solid phases is not predicted. |
Abstract: | Tundish is the last reactor where significant metallurgical operations can still be done. Calcium aluminate slags are able to positively contribute to metallurgy considering oxide separation, protection against reoxidation and preclusion of resulphurisation. However, these are poor insulators. When using low melting point slags it is necessary to use another covering material. The deviation from saturation can be used as a measure of absorption capacity. By utilizing computerized construction of ternary and quaternary diagrams it is possible to compare different slags and to find proper slag compositions with reasonable capacity to dissolve inclusions. Objective of the present technical contribution is to evaluate tundish slag capacity to absorb inclusions, considering a particular tundish industrial slag and the changes in its chemical composition during continuous casting of steel. It was observed that slag composition changed during the continuous casting process; this variation is possibly related to interaction between the CaO-Al2O3 liquid slag and the rice hull ash layer which is used above it. Computational thermodynamics was used to determine activity of alumina dissolved in liquid slag; it was observed that the variation in slag composition did not change slag capacity to absorb inclusions, since precipitation of Al2O3 solid phases is not predicted. |
URI : | http://www.repositorio.ufc.br/handle/riufc/58042 |
ISSN : | 1982-9345(dentro do artigo) 2594-5300 (https://abmproceedings.com.br) |
Aparece en las colecciones: | DEMM - Trabalhos apresentados em eventos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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2016_eve_mmdasmpereira.pdf | 717,68 kB | Adobe PDF | Visualizar/Abrir |
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