Fluorite
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Heterogeneous Fenton-like catalytic degradation of phenazine dye over CeO2 (CP-2) nanoscale powder
Abstract A heterogeneous Fenton-like process was explored for oxidation of phenazine dye using ceria polishing material (CP-2). XRD, SEM, FTIR, UV-vis DRS, and pHPZC techniques were applied to characterize the catalyst features. The performance of the heterogeneous Fenton-like process was investigated under various parameters (reaction time, pH, H2O2 concent
Cerâmica. Publicado em: 2022
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2. Influence of the pH regulator on the dolomite hydrophobization process
Abstract A study was carried out to investigate the combined effect of released ions in the pulp by pH regulator and mineral surface on dolomite flotation. The tests were carried out using a dolomite sample in a bench flotation cell with automatic froth remover. Zeta potential measurements, solution conductivity and FTIR analysis were done to support the int
REM, Int. Eng. J.. Publicado em: 2020-09
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3. CeαMn1-αO2 catalysts supported over γ-Al2O3 prepared by modified redox-coprecipitation methods for n-hexane combustion
A series of CeαMn1-αO2 catalysts supported on γ-alumina with various molar concentrations of Ce (α, from 0 to 0.90) was synthesized by coprecipitation, applying two different precipitating agents, namely, sodium hydroxide (method 1) and sodium carbonate (method 2), with the use of sodium permanganate as a redox agent for precipitation. XRD profiles of th
Quím. Nova. Publicado em: 2020-04
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4. Aging simulation of the tailings from Stava fluorite extraction by exposure to gamma rays
Abstract Tailings storage facilities are disposal systems for storing the waste products of the mining industry consisting of a slurry mixture made of soil, rock and water that remain after the mineral values have been removed from the patent ore. Tailings dams are supposed to last forever, so after their deposition, tailings can experience aging processes w
REM, Int. Eng. J.. Publicado em: 2017-12
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5. Efecto sobre la dilución de la granulometría de la ferroaleación en el alma de electrodos tubulares revestidos bajo la influencia de la composición del revestimiento
The possibility of working at lower current and, consequently, reaching low dilution, points out advantages in the use of metal cored coated electrodes over conventional ones for hardafacing. It is known that the grain size of the filling alloy elements plays important role in the exothermic oxidation process, reflecting on the operational characteristics of
Soldagem & Inspeção. Publicado em: 2011-03
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6. Prospecção de fluorita da parte norte da zona de cisalhamento Rio dos Brugres (ZCRB), Distrito Fluorítico de Santa Catarina
No distrito fluorítico de Santa Catarina, as jazidas filoneanas do subdistrito Grão-Pará estão associadas à zona de cisalhamento Rio Bugres, de direção geral NNE-SSW, que pode ser seguida continuamente, de sul para norte, até a jazida Nova Fátima. Ao norte desta jazida, a zona de cisalhamento Rio dos Bugres aparentemente desaparece e só são conhec
Publicado em: 2011
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7. Geoquímica de elementos terras raras e elementos traço na fluorita : comparação entre filões das partes norte e sul do distrito fluorítico de Santa Catarina e implicações no modelo genético
Rare earth elements geochemistry was applied on fluorite from Grão-Pará sub-district, northern Santa Catarina Fluorite District, and compared with southern ore veins data in attempt to identify fluid, REE and F sources. The data suggest different granitic rocks as F sources for southern and northern fluorite and that rare earth elements content in the late
Publicado em: 2010
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8. Flocculation of fine fluorite particles with Corynebacterium xerosis and commercial long chain polymers
This work aimed to study, comparatively, the flocculation of fluorite particles with Corynebacterium xerosis cells and three commercial long chain polymers. Best flocculation results were obtained with cells of C. xerosis and with an anionic polyacrylamide. Both were effective in solids removal and water clarification, although flocculation with C. xerosis c
Publicado em: 2010
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9. Contribuição do estudo aeromagnetométrico e de imagens orbitais (TM LANDSAT 5) ao conhecimento do arcabouço geológico do Distrito Fluorítico de Santa Catarina (Brasil) e suas implicações para a prospecção de fluorita
Geophysical (aeromagnetometry) and remote sensing (TM LANDSAT) data allowed to recognize different structural patterns at the Santa Catarina fluorite district. These features correspond to N-S and NNE-SSW structural lineaments with potential environments for fluorite prospection. In detail, the used treatment allowed to identificate minor structures associat
Publicado em: 2010
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10. Síntese e caracterização de NiO-CGO para anodo e eletrólitos sólidos e base de Céria para SOFC
The direct use of natural gas makes the Solid Oxide Fuel Cell (SOFC) potentially more competitive with the current energy conversions technologies. The Intermediate Temperature SOFC (IT-SOFC) offer several advantages over the High Temperature SOFC (HT-SOFC), which includes better thermal compatibility among components, fast start with lower energy consumptio
Publicado em: 2009
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11. Síntese, caracterização estrutural, termoquímica e elétrica de materiais cerâmicos para células a combustível de óxido sólido / Synthesis, structural, thermochemical and electrical characterization of ceramic materials for solid oxide fuel cells
Nanocrystalline yttria or scandia stabilized zirconia (YSZ, ScSZ) powders with fluorite-type structure were synthesized by the polyacrylamide, the polymeric precursor and the precipitation methods. Powders were characterized by X-ray diffraction (XRD), simultaneous (TG and DTA or DSC) thermal analysis, nitrogen adsorption analysis, scanning electron microsco
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/12/2008
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12. Efetividade do uso tópico de fluoreto e da escovação no controle de cáries produzidas "in vivo"
The objective of this clinical study was to evaluate the effectiveness of the toothbrushing with and without fluoride and the daily fluoride rinse (NaF 0.05%) on produced white spot, in vivo. This was a clinical study, controlled, randomized and triple blind. Thirty patients were selected for orthodontics reasons from Orthodontics Specialization Course at th
Publicado em: 2008