Título: | PRELIMINARY CHEMICAL PROCESSING OF LATERITIC NICKEL ORES BY SULPHATION ROASTING | ||||||||||||
Autor: |
MARIANA AGUIAR DE AZEVEDO TAVARES |
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Colaborador(es): |
RODRIGO FERNANDES MAGALHAES DE SOUZA - Orientador |
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Catalogação: | 24/MAR/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=51972&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=51972&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.51972 | ||||||||||||
Resumo: | |||||||||||||
Nickel is a corrosion resistant metal used in abundance in the industry.
Regarding the lateritic occurrences, nickel is distributed in the mineral lattice in a
substitutional manner and at low levels, which in turn makes mineral processing
operations less effective for concentration. Thus, it is essential that chemical
processing initiatives are established to increase the content of the metal of interest.
From this perspective, the present master s thesis proposes to study the development
of a pretreatment route based on the formation and selective solubilization of
sulfates in order to verify operational conditions that allow the enrichment of nickel
in the material of interest. In this context, a thermodynamic study was conducted in
which the theoretical feasibility of using iron sulfate III as a SO4 source for the
formation of Ni, Co, Al, Mg and Ca sulfates was verified. The experimental roasting
study was conducted in muffle furnace in times of 30 and 60 minutes, different
mixtures with different proportions of Fe2(SO4)3, at temperatures ranging from
500 celsius degrees to 900 celsius degrees. Then, the reaction product was solubilized in water at 80 celsius degrees for 1 hour. It was observed at 700 celsius degrees for a residence time of 30 minutes, given an excess of 30 percent of iron sulfate III, a recovery of 34 percent of nickel, 68 percent of cobalt and 58 percent of
magnesium, according to analysis in ICP-OES. An interesting point of the study is
associated with the formation of extraction liquors without the presence of iron,
whether it comes from laterites or from the roasting reagent. The route is promising
as an initial stage for processing, especially regarding to the concentration of more
than half of the Co content in a stream, particularly in the case of an ore rich in Fe
and Si.
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