Por favor, use este identificador para citar o enlazar este ítem: 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)
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