Título: | FUNDAMENTAL ASPECTS OF HEMATITE FLOTATION USING THE BACTERIAL STRAIN RHODOCOCCUS RUBER | |||||||
Autor: |
LESLIE YASMIN LÓPEZ OLIVARES |
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Colaborador(es): |
MAURICIO LEONARDO TOREM - Orientador ANTONIO GUTIERREZ MERMA - Coorientador |
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Catalogação: | 24/NOV/2015 | Língua(s): | ENGLISH - UNITED STATES |
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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=25500&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=25500&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.25500 | |||||||
Resumo: | ||||||||
In the recent years, research has been developed in the application of
microorganisms in mineral technology, acting as environmental friendly
collectors, depressors and/or frothers and inducing hydrophobic properties,
since they can be selectively adhere onto the surface of the mineral. This
research work deals with the fundamental aspects of hematite flotation using
the bacterial strain Rhodococcus ruber. The aim of this research was to study
and evaluate the behavior of Rhodococcus ruber strain before and after
interaction with hematite particles. The sample was conditioned with the
biomass suspension by stirring under specific conditions such as particle size,
biomass concentration, pH solution and conditioning time. Among the studies
conducted are the microbial adhesion to the mineral surface, zeta potential
measurements and analysis of infrared spectra before and after interaction of
Rhodococcus ruber with hematite, as well as microflotation studies. The
results showed a change in hematite zeta potential profile after interaction with
Rhodococcus ruber, and its adhesion onto the mineral surface was higher at
pH 3 and at concentration of 0.60 g.L(-1) (10(9) cells). Flotation studies were
carried out in a 0.23L modified Partridge-Smith flotation cell, and the highest
floatability (84 percent) was achieved at size fraction any less 53 more 38 um. Also, floatability
studies were performed using frother Flotanol D24 combined with the
Rhodococcus ruber biomass, concluding with interesting results in function of
the particle size range. This work aims to evaluate the efficiency of
bioflotation of minerals, particularly hematite, and the potential use of
Rhodococcus ruber as biocollector, projecting its future application in mineral
flotation industry.
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