Título: | PHOSPHORUS SELF-FLUXED IN DIRECT REDUCTION PELLETS | |||||||
Autor: |
MAURICIO MARCOS OTAVIANO |
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Colaborador(es): |
JOSE CARLOS D ABREU - Orientador |
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Catalogação: | 04/NOV/2021 | 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=55634&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=55634&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.55634 | |||||||
Resumo: | ||||||||
Actually the iron ore deposits in the world have the tendency to decrease
the iron content, increasing the gangue (silica, alumina, phosphorus, etc.) and to
further occurrence of hydrated ores. This change demands improvements in
concentration processing techniques for feasible mining operations. The
phosphorus is a contaminant that, in some contents, causes the embrittlement of
steels, been, wherefore, a limitative to the use of important ore deposits, mostly
regarding the weathered iron ores or supergene origins. Several studies were
and have been conducted aiming to develop technologies capable of decreasing
the P content during the beneficiation process. However, until now, the economic
viability of such studies has not been feasible, considering the production scale
and the harmful effects to the environment. In Samarco’s case, the mine
geological formation is mostly supergene, which is responsible for the presence
of the goethite ores, pointed as the main phosphorus carrier. The main point of
this work was, with an innovating approach, formulate a new type of pellet
addressed to direct reduction processes in a manner that the P could be fluxed
into the slag phases. These phases, produced through an adequate thermal
cycle of induration and with an optimized chemical composition, resulted in
pellets with stable slags containing, as well as in the produced DRI and in the
melted bath generated during the primary refining performed in the EAF. For this
purpose, it was done, further to a wide bibliographic review, an original analytical
procedure to quantify the released phosphorus and a series of planned
experiments, such as: the kinetic evaluation of the phosphorus migration from
the mineral phases of the pellet feed when subjected to different thermal
treatments; analysis of the induration process variables which could affect the
phosphorus release and its fluxing into the slag ; Finally, the stability of the fluxing
phases during the reduction in a laboratory scale and the melting and refining
process in a semi-industrial EAF, were performed. The obtained results showed
the feasibility of this new approach produce DR pellets with self-fluxed
phosphorus trapped in stable phases.
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