Hematite
Mostrando 1-12 de 138 artigos, teses e dissertações.
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1. An alternative route to extract nickel and cobalt from non-commercial laterite ore
Abstract Laterite ores, which represent around two-thirds of nickel reserves, became an important source of nickel and cobalt metals. The objective of the present study was to investigate the efficiency of a hybrid route to extract nickel and cobalt present in a laterite ore sample which was not commercially attractive to be processed through the current rou
REM - International Engineering Journal. Publicado em: 2022
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2. Magnetic concentration route for recovering pellet feed fines stored in a mining dam
Abstract The greatest and noblest challenge of mining engineering for the present and the future of iron ore treatment could be considered as the pursuit of optimizing the use of mineral resources. The use of mining tailings, in the mineral sector itself, or in another industrial branch, meets the needs of circular economy as it increases the useful service
REM - International Engineering Journal. Publicado em: 2022
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3. Polyacrylamides as co-depressant in hematite and quartz microflotation
Abstract In the present study, microflotation experiments were performed on pure minerals systems involving hematite and quartz in the presence of etherdiamine as collector. The influence of polyacrylamides as co-depressant was investigated in a blend with starch depressant. The results obtained demonstrated that all the polyacrylamides used were efficient i
REM, Int. Eng. J.. Publicado em: 2021-09
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4. Fundamental bioflotation aspects of hematite using an extracted Rhodococcus opacus by-product
Abstract The aim of this study is to assess the floatability of hematite using a crude biosurfactant (BS) extracted from Rhodococcus opacus. Throughout high-pressure ethanol extraction, unrefined surfactant was extracted from the bacteria with a yield of 0.3 g/L. An FTIR analysis on this extract, shows the presence of alcohol (–OH) and ketone (C=O) groups,
REM, Int. Eng. J.. Publicado em: 2021-09
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5. Hematite and quartz microflotation using millet starch as depressant
Abstract Brazil is among the world's largest iron ore producers. The standard concentration method is reverse cationic flotation using amines, and their derivatives, such as quartz collector and corn (as either grits, flour, or starch) as the hematite depressant. Corn is considered cheap, abundant, and available all around the country. However, its demand ha
REM, Int. Eng. J.. Publicado em: 2021-01
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6. Simulação de condição de fluxo em duto circular transportando polpa de bauxita de Paragominas (PA) na presença de aditivo modificador de viscosidade
RESUMO Sistemas de bombeamento de minérios por dutos tem atraído o interesse de mineradoras pois se tornam uma alternativa de transporte muito eficiente. Dentre os maiores desafios no projeto de bombeamento por dutos está a estimativa do fator de atrito, já que são muitas as variáveis que afetam este parâmetro. Uma amostra de polpa de bauxita de Parag
Matéria (Rio J.). Publicado em: 25/11/2019
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7. Degradation of Acid Red 8 Dye Using Photo-Fenton Reaction Mediated by Titanium Modified Catalysts
Catalysts prepared by co-precipitation of iron and titanium were evaluated in heterogeneous photo-Fenton degradation of the azo dye Acid Red 8 under blacklight irradiation. Materials with different titanium contents (0 < Ti/Fe < 0.6) were characterized using X-ray diffractometry, scanning electron microscopy, X-ray fluorescence spectroscopy, specific surface
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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8. Mineralogical Evolution of Magnetic Rhodic Oxisols under Different Lithological Influences in Brazil
ABSTRACT Ferrimagnetic Fe-oxides are important soil components, which are present in most of the agricultural soils of Brazil. Distinction, origin, and assessment of the influence of these minerals on magnetism and geochemistry is a challenge for mineralogists. This study aimed to characterize mineralogically Fe-rich Rhodic Oxisols ( Latossolos Vermelhos ) o
Rev. Bras. Ciênc. Solo. Publicado em: 30/09/2019
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9. Evaluation of hematite and quartz flotation kinetics using surfactant produced by Rhodococcus erythropolis as bioreagent
Abstract The use of biosurfactants as reagents represents a promising alternative to the conventional surfactants used in the mineral industry because they may present low toxicity and high biodegradability. Therefore, this research studied the hematite and quartz flotation kinetics using surfactant produced by Rhodococcus erythropolis as bioreagent. The flo
REM, Int. Eng. J.. Publicado em: 16/09/2019
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10. Manifestações simbólicas em Santa Elina, Mato Grosso, Brasil: representações rupestres, objetos e adornos desde o Pleistoceno ao Holoceno recente
Resumo Santa Elina, na Serra das Araras, no Mato Grosso, oferece uma notável composição de dois conjuntos arqueológicos excepcionais: a) um dispositivo parietal de um milhar de pinturas, adaptando-se estreitamente à morfologia do abrigo que se encontra ao pé de uma falésia calcária; b) um conjunto de ocupações distribuídas em duas sequências estr
Bol. Mus. Para. Emílio Goeldi. Ciênc. hum.. Publicado em: 26/08/2019
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11. Mineralogy and preliminary assessment of the potential uses of alluvial clays from Batouri (Eastern-Cameroon)
Resumo Este estudo teve como objetivo avaliar os usos potenciais de materiais argilosos aluviais de Batouri. Suas características mineralógicas, químicas e algumas físico-mecânicas são apresentadas, bem como algumas características de tijolos queimados em 900, 950, 1000, 1050 e 1100 °C. As matérias-primas consistiram de caulinita, quartzo, feldspato
Cerâmica. Publicado em: 15/08/2019
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12. Iron oxide/titania composites for radar absorbing material (RAM) applications
Resumo Compósitos de óxido de ferro/titânia foram sintetizados pelo método de precipitação. A quantidade de óxido de ferro foi variada nos compósitos. Fase única (anatásio) foi obtida para a fração em massa de 0-20% e três fases (anatásio, magnetita e hematita) foram encontradas para as frações de 30% e 40% de óxido de ferro. O tamanho de cr
Cerâmica. Publicado em: 15/08/2019