Iron Carbonate
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. A FORMAÇÃO DA CAMADA PROTETORA DE FeCO3 E O CONTROLE DA CORROSÃO POR CO2 EM CONDIÇOES DE FLUXO TURBULENTO
The formation of a protective layer of iron carbonate (FeCO3) can reduce the rates of corrosion and prolong the useful life of carbon steel. However, turbulent flow conditions in this layer can easily be damaged and thus compromise the protection of the steel. In this work, will be presented a methodology based on the chemical aspects of the mechanism of for
Quím. Nova. Publicado em: 2016-11
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2. Genesis and Classification of Soils Containing Carbonate on the Apodi Plateau, Brazil
ABSTRACT Information is scarce on the genesis and classification of soils derived from calcareous rocks in the Northeastern region of Brazil. This study describes the morphological, physical, chemical, mineralogical, and micromorphological properties of four soil profiles (P1-P4) located in the Apodi Plateau. A pedogenesis hypothesis and soil classification,
Rev. Bras. Ciênc. Solo. Publicado em: 31/05/2016
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3. Iron deficiency anemia among kindergarten children living in the marginalized areas of Gaza Strip, Palestine
Background: iron deficiency anemia is the most common type of nutritional anemia; it has been recognized as an important health problem in Palestine. This study was conducted to estimate the prevalence and to identify possible risk factors of iron deficiency anemia among kindergarten children living in the marginalized areas of the Gaza Strip and to evaluat
Rev. Bras. Hematol. Hemoter.. Publicado em: 2014-04
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4. DinÃmica de fÃsforo em manguezais impactados por Ãguas residuÃrias no Estado do CearÃ. / Dynamics of phosphorus in mangroves impacted by the state of CearÃ.
Recent studies demonstrated the efficacy of mangrove retaining nutrients and, in particular, the ability of the mineral component of the buffer in its high soil phosphorus levels. In general, the mangroves have been considered as important sinks of nutrients due to its high capacity purification of effluents. However, depending on the geochemical conditions
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/06/2012
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5. Tectônica e sedimentação do Grupo Jacadigo (Neoproterozóico, MS) / Tectonics and sedimentation of Jacadigo Group (Neoproterozoic, MS)
At the south of Corumbá, Mato Grosso do Sul state, there are huge topographic elevations made of Jacadigo Groups neoproterozoic sedimentary deposits. Those mountains are known as Maciço do Urucum. The basal unit named Urucum Formation is composed by siliciclastic rocks with maximum thickness of 200 to 300m. The sucession continues with mixed GIF (granular
Publicado em: 2010
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6. SELETIVIDADE NA FLOTAÇÃO DE MINÉRIOS FERRÍFEROS DOLOMÍTICOS
This work studied the best conditions for selective flotation in the iron-bearing minerals, quartz and dolomite system. Samples of hematite, quartz and dolomite were studied using a Fuerstenaus microflotation cell. The following collectors have been studied: sodium oleate, ether-monoamine and saponified babassu seed oil. Tannin, dextrin and sodium silicate h
Publicado em: 2009
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7. Petrologia e metalogenia do depósito primário de nióbio do complexo carbonatítico-foscorítico de Catalão I, GO
The Catalão I carbonatite-phoscorite complex is part of the Alto Paranaíba Igneous Province (APIP) and consists of a multi-intrusion body zoned from bebedourite-(piroxenite)-series rocks in the border to carbonatite- and phoscorite-series rocks in the core. The phoscorite-series rocks consist of apatite, magnetite and a Mg-silicate (phlogopite or olivine)
Publicado em: 2009
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8. Analysis of inorganic composition and release of formaldehyde after manipulation of endodontic sealers / Analise da composição inorganica e da liberação de formaldeido apos a manipulação de cimentos endonticos
This study evaluated chemical composition (inorganic) and formaldehyde presence in root-canal sealers. Seven root-canal sealers were chosen: four based-zinc-oxide-eugenol (ZOE) (Targer Canal Sealer, Konne; Endo Fill, Dentsply; Endométhasone N, Septodont and; Pulp Canal Sealer, Kerr); two based-mineral trioxide aggregate (MTA) (Endo CPM Sealer, EGEO Dental a
Publicado em: 2009
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9. Evolução quimica e isotopica dos fluidos associados a mineralização de Fe-Cu-Au do deposito Alvo 118, provincia mineral de Carajas - PA / Chemical and isotopic evolution of the fluids from the Alvo 118 Fe-Cu-Au do deposit, Carajas mineral province (PA)
The Alvo 118 iron oxide-copper-gold (IOCG) deposit (170 Mt @ 1,0 wt% Cu, 0,3 g/t Au), together with the world-class Sossego and Cristalino deposits, lie in the southern sector of the Carajas Mineral Province (CMP) along a steeply-dipping, WNW-ESE-striking, 60 km-long shear zone, close to the contact of the Itacaiunas Supergroup metavolcano-sedimentary sequen
Publicado em: 2009
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10. Características epigenéticas do depósito de cu-au chapada, arco magmático de goiás
The Cu-Au Chapada deposit is located from 8km of Alto Horizonte-GO. The geologic picture is dominated by metavulcanic sedimentary sequences that integrate the Neoproterozoic Magmatic Arc of Mara Rosa, located in the central portion of the Tocantins Province. The framework of the deposit is represented by an antiform whose core is composed by association of t
Publicado em: 2009
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11. Extração líquido-líquido de urânio(VI) do colofanito de itataia (Santa Quitéria, Ceará) por extratantes orgânicos em presença de ácido fosfórico
This work describes the liquid-liquid extraction of uranium after digestion of colofanite (a fluoroapatite) from Itataia with sulfuric acid. The experiments were run at room temperature in one stage. Among the solutions tested the highest distribution coefficient (D > 60) was found for 40%vol. DEHPA (di(2-ethyl-hexyl)phosphoric acid) + 20% vol. TOPO (triocty
Química Nova. Publicado em: 2008
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12. Geologia, geometalurgia, controles e gênese dos depósitos de fósforo, terras raras e titânio do complexo carbonatítico Catalão i , GO
This work describes the geological and geometallurgical characteristics of the phosphate, titanium, niobium and rare-earth elements deposits in the northeast part of the Catalão I carbonatite complex, Central Brazil. The mineralization controls were determined for magmatic, metasomatic and weathering processes. The ore types were defined on the basis of geo
Publicado em: 2008