Título: | THE REDUCTION KINETICS KINETICS OF SELF-REDUCING BRIQUETTES | |||||||
Autor: |
JOSE HENRIQUE NOLDIN JUNIOR |
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Colaborador(es): |
JOSE CARLOS D ABREU - Orientador |
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Catalogação: | 26/JUN/2003 | 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=3667&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=3667&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.3667 | |||||||
Resumo: | ||||||||
The present work, analyzes the impact of the key variables,
temperature, reduction atmosphere and composition of the
ferrous and carbonaceous materials, on the kinetics of self-
reducing briquettes, for two types of samples, over the
temperature range 1000 - 1300 Celsius Degree. A brief history of the
ironmaking science is presented, covering the most relevant
features of the main self-reduction processes and a survey
of the main published researches on the same subject
relating to thermodynamic and kinetic aspects. The
experimental procedure, details of the apparatus used, the
experimental parameters, characterization of the samples
and the results are described. Based on the results
obtained, the kinetic parameters were evaluated determining
the apparent activation energy (E0) as 177,10 kJ/mol and
the pre-exponential frequency factor of the Arrehnius
equation (ê0) as 0,97x10-3 s-1. It is observed that,
increasing the temperature, decreasing the inert gas flow
(N2) and using CO atmosphere, improves significantly the
kinetics of reduction of self-reducing briquettes, raising
the rate of iron oxide reduction. The results confirm that
the Boudouard reaction is the rate limiting step of the
overall reaction, up to 1200 Celsius Degree, when a mixed control
starts, where the influence of the iron oxides reduction
shall be also considered. The significance of this
experimental results and observations to the design and the
development of an innovative self-reduction smelting
process are highlighted.
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