Título: | AUTOMATIC QUANTIFICATION OF METALLIC IRON IN SELF-REDUCING IRON ORE BRIQUETTES BY DIGITAL MICROSCOPY | |||||||
Autor: |
DEBORA TURON WAGNER |
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Colaborador(es): |
SIDNEI PACIORNIK - Orientador JOSE CARLOS D ABREU - Coorientador |
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Catalogação: | 15/JAN/2013 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | |||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=20987&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=20987&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.20987 | |||||||
Resumo: | ||||||||
The production of primary iron, intermediate step in steelmaking chain, is
mostly done by the traditional route of blast furnace. However, alternative
technologies are increasing their market share. Among the technologies, Tecnored
is a very promising Brazilian ironmaking process and the goal of this master
dissertation is the study of it iron-bearing burden. The Tecnored technology
utilizes self-reduced iron ore briquettes in a modulate shaft furnace to obtain hot
metal. The self-reduced agglomerates, cold bonded, are produced from a mixture
of flux, binder, fines of iron ore, residues containing iron and carbonaceous
material as a reducing agent. The burden characterization in ironmaking process is
essential to study the pores distribution and evaluate the structural integrity and
mechanics of fluids during the reduction process, and quantify and analyze the
metallic iron distribution along the briquette’s volume. This dissertation main goal
is to develop a new methodology of quantification of the metallic iron in selfreduced
iron ore briquettes, through automatic routines of image processing,
captured in bright field of a reflected light optical microscopy (MRL), and
mapping pores and metallic iron automatically along the cross-sections analyzed.
The tested briquettes utilized two reducing agents – coal fines (CM) and coke of
petroleum (CVP), and it was submitted in two different reduction times and two
different briquettes’ thickness. The experimental process presented some
challenges, from the cross section cut to be polished and observed in MRL, to the
identification and mapping of the phases in the briquettes. To validate the
methodology, the results of the quantification of metallic iron through image
analysis were compared to the results of the traditional technique of chemical
analysis. The porosity and metallic iron maps provided a qualitative evaluation of
reduction time and the effect of briquettes’ thickness, for each type of cabonaceus
reducing agents.
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