Quartz Dissolution
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Potassium recovery from Brazilian glauconitic siltstone by hydrothermal treatments
Abstract Silicate rock Verdete, collected in the central region of Minas Gerais state (Brazil) and composed mostly of micas (glauconite and muscovite) and tectosilicates (K-feldspar and quartz), was hydrothermally treated with several reactants in order to release and recover potassium. The hydrothermal products were characterized by flame photometry, XRD, X
REM, Int. Eng. J.. Publicado em: 2020-06
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2. Impact of an Alkaline Solution on the Chemistry, Mineralogy, and Sorption Properties of a Typic Rhodudult Soil
Abstract The preferred option for disposal of short-lived low and intermediate level radioactive wastes is a near surface disposal facility in which soil is one of the barriers that avoid radionuclide migration outside the controlled area. For construction of that kind of facility, concrete is widely used, and its interaction with water induces its degradati
Rev. Bras. Ciênc. Solo. Publicado em: 09/11/2017
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3. Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
The alkali-aggregate reaction (AAR) in concrete structures is a problem that has concerned engineers and researchers for decades. This reaction occurs when silicates in the aggregates react with the alkalis, forming an expanded gel that can cause cracks in the concrete and reduce its lifespan. The aim of this study was to characterize three coarse granitic a
Mat. Res.. Publicado em: 15/04/2014
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4. Iron oxides dynamics in a subtropical Brazilian Paleudult under long-term no-tillage management
Replacing conventional tillage (CT) with no-tillage (NT) management alters the pedoenvironment and the rate of topsoil processes, with possible effects on dissolution processes associated with iron oxides and therefore soil mineralogy. This study aimed to determine the effect of NT on the content and distribution of types of iron oxides in a Rhodic Paleudult
Sci. agric. (Piracicaba, Braz.). Publicado em: 2013-02
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5. Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
Coastal-eolian sabkha sandstones from different ages and basins show similar diagenetic patterns, which understanding is important for their evaluation as geochemical systems and as hydrocarbon reservoirs. The Carboniferous sandstones of the Juruá Formation (Solimões Basin) are one of the most important gas reservoirs of Brazil. The sandstones and interbed
Publicado em: 2010
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6. Magmatic epidote and amphibole from the Rio Espinharas hybrid complex, Northeastern Brazil
The petrography and chemistry of epidote and amphibole from the Rio Espinharas hybrid complex (REHC), northeastern Brazil are reported. The Rio Espinharas complex is composed of an intimate association of diorite to shoshonitic metaluminous quartzmonzonite to slightly peraluminous syenogranite. The epidote shows four textural relationships: three are primary
Publicado em: 2010
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7. 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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8. Flotação de espodumênio, microclina, quartzo e muscovita com coletores aniônicos, catiônicos, anfotéricos e mistura de coletores
The worldwide lithium consumption is chiefly associated with the industries such as primary aluminum, glass, ceramics and lubricants being distinguished however the increasing and strategical use of lithium in components of batteries, nuclear reactors, parts for the aeronautical industry and the manufacturing of pharmaceuticals. Production of lithium carbona
Publicado em: 2006
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9. "Interações entre modelado e solo no transecto Espraiado, São Pedro, SP" / Soil-landform relationships in the Espraiado Transect, São Pedro, São Paulo.
The objective of this research is to identify macro and micromorphological features (field and and optical microscopic scale, respectively) and analitycal evidences (physical and chemical parameters), indicative of translocations, losses and acumulations mechanisms inside the soils, that probably leads to changes in the form of a transect, localized in São
Publicado em: 2002
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10. Determinação dos elementos do grupo da platina após fusão coletora com sulfeto de nível
The nickel sulfide fire assay was used to separate and to concentrate the platinum group elements (PGE) and gold (Au) from geological matrices, seeking their analytic determination. The fire assay was accomplished by fusing 10 g of sodium carbonate, 20 g of sodium tetraborate, 1 g of nickel, 0,75 g of sulfur and 10 to 20 g of sample, thoroughly mixed. After
Publicado em: 1999
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11. Estudos sedimentológicos e o contexto estrutural da formação Serra do Martins, nos platôs de Portalegre, Martins e Santana/RN
This dissertation deals with sedimentological and structural framework of the siliciclastic rock of the Serra do Martins Formation (FSM) in the Portalegre, Martins and Santana plateau, located to the south of Potiguar Basin, in the southwest and central Rio Grande do Norte state. This formation, regarded as of Oligo-Miocene age based on intrusive relations o
Publicado em: 1999