Título: | A METHOD FOR THE CHARACTERIZATION OF IRON ORE SINTER: DIGITAL MICROSCOPY AND IMAGE ANALYSIS | ||||||||||||||||||||||||||||||||||||
Autor: |
JULIO CESAR ALVAREZ IGLESIAS |
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Colaborador(es): |
SIDNEI PACIORNIK - Orientador OTAVIO DA FONSECA MARTINS GOMES - Coorientador |
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Catalogação: | 13/FEV/2009 | 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=13047&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=13047&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.13047 | ||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||
In the present work, a method for the characterization of
iron ore sinter, based on digital microscopy and image
analysis is proposed. Iron ore sinters are multi-phase
materials, with heterogeneous macro and micro structure. In
general, the main phases are: hematite, magnetite, ferrites
and silicates, besides pores. Employing an automated
optical microscope, individual high magnification images
were obtained, covering the full cross section of the
samples. Likewise, and covering the same area, low
magnification mosaic images were obtained. Mosaics provide
a powerful qualitative view of the whole sample, and a
quantitative evaluation of the main phases, albeit with
limited resolution. A quantitative comparison of phase
fractions between the mosaic and the high magnification
images was performed through an automatic image processing
and analysis routine, also developed in the present work.
While finer phases, such as silicates, could only be
discriminated at the best employed optical resolution, the
main phases, such as hematite, were identified at all
resolutions. For hematite, magnetite, and ferrites, the
largest relative error in area fraction was 12%, when
comparing images acquired with the 5X and 20X objective
lenses, for three different samples. Results for silicates
were less accurate, with relative errors up to 44%. A
comparison with x-ray diffraction results, employing the
Rietveld method, was also performed. These results indicate
that digital microscopy provides a flexible method for the
characterization of these materials, allowing the
combination of global qualitative information with local
quantitative data.
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