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Mostrando 1-12 de 99 artigos, teses e dissertações.
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1. Thermostimulated crystal structure transformation of the polymineral clay submicron particles
Abstract Changes in the structure of phyllosilicate microparticles of submicron fractions of polymineral clay with an average size of 290 nm, as well as changes in the positions of impurity ions of transition metals in the crystal lattice, were studied by X-ray diffraction analysis, Fourier transform infrared spectroscopy, and high-resolution electron parama
Cerâmica. Publicado em: 2022
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2. Characterization of a complex carbonate-silicate apatite ore and its concentration by a two-stage anionic flotation method
Abstract A carbonate-silicate low weathering phosphate ore from an igneous origin deposit in Southeastern Brazil presents a challenge mainly for apatite flotation from its gangue minerals, calcite and dolomite, plus the presence of phlogopite, diopside, magnetite, richterite, ilmenite, vermiculite, quartz and many other minor impurities. Recently, selectivit
REM - International Engineering Journal. Publicado em: 2022
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3. Not even Freud explains this!
Abstract The final disposal of tailings in the form of paste is a technological alternative. The objective of the present study is to obtain knowledge and compare different operational conditions that are favorable to the production of paste with the fine tailings generated after final desliming stage, obtained from the processing of metallic and non-metalli
REM, Int. Eng. J.. Publicado em: 2021-01
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4. Production of paste from fine tailings streams in a laboratory scale column thickener
Abstract The final disposal of tailings in the form of paste is a technological alternative. The objective of the present study is to obtain knowledge and compare different operational conditions that are favorable to the production of paste with the fine tailings generated after final desliming stage, obtained from the processing of metallic and non-metalli
REM, Int. Eng. J.. Publicado em: 2021-01
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5. 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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6. Effect of calcium concentration on calcite flotation from apatite using carbonic gas
Abstract The flotation process currently considered for apatite concentration from the Santa Quitéria phosphate deposit (Brazil), involves bulk flotation of apatite and calcite with anionic collector at pH=10 followed by calcite flotation at pH=5.5, adjusted with H3PO4. Although this concept is efficient from the point of view of separation between apatite
REM, Int. Eng. J.. Publicado em: 2020-06
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7. GUILHERME, Alexandre Anselmo; MORGAN, W. John. Philosophy, dialogue, and education. Nine Modern European Philosophers [Filosofia, diálogo e educação: nove filósofos europeus modernos]. London: Routledge, 2018. 190 p.
Abstract The flotation process currently considered for apatite concentration from the Santa Quitéria phosphate deposit (Brazil), involves bulk flotation of apatite and calcite with anionic collector at pH=10 followed by calcite flotation at pH=5.5, adjusted with H3PO4. Although this concept is efficient from the point of view of separation between apatite
Bakhtiniana, Rev. Estud. Discurso. Publicado em: 2020-06
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8. Utilização de casca de ovo como fonte alternativa de cálcio na obtenção de titanato de cálcio (CaTiO3)
RESUMO No presente trabalho, detalha-se o estudo do reaproveitamento da casca de ovo como fonte alternativa mineral de calcita na síntese de titanato de cálcio (CaTiO3). As matérias-primas foram caracterizadas por difração e fluorescência de raios X e as composições foram formuladas e sinterizadas em diferentes condições. Após a sinterização, as
Matéria (Rio J.). Publicado em: 25/11/2019
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9. Aço carbono 1040 como indicador de agressividade do solo e da pasta de cimento em sistemas de ancoragem de linhas de transmissão
RESUMO O encapsulamento de hastes de âncora em pasta de cimento reduz o contato dos materiais metálicos com os ambientes agressivos, em torres estaiadas de linhas de transmissão de energia elétrica. Contudo, ainda são reportados casos de falha prematura devido à corrosão do sistema de ancoragem. O íon cloreto é considerado um dos principais respons�
Matéria (Rio J.). Publicado em: 16/09/2019
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10. Interações ambientais e resistência física de um depósito de resíduos finos da indústria de rochas ornamentais
RESUMO Embora vários trabalhos proponham aplicações para os resíduos finos gerados no beneficiamento de rochas ornamentais, ainda não há evidências das vantagens financeiras para tal aproveitamento. Assim, a descrição dos depósitos existentes, muitos deles construídos sem triagem ou qualquer medida de proteção ambiental, torna-se imprescindível
Eng. Sanit. Ambient.. Publicado em: 15/08/2019
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11. APLICAÇÃO DA ESPECTROSCOPIA RAMAN NA CARACTERIZAÇÃO DE MINERAIS PERTENCENTES A UMA GEOCOLEÇÃO
Lots of Educational Institutions hold their own geocollection due to its utility and versatileness in the practical formation of new generations of skillful professionals in many areas of Science and Technology. The Geoscience laboratory of the Federal University of São Carlos has a collection of minerals used in engineering, mineralogy and other technologi
Quím. Nova. Publicado em: 18/07/2019
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12. Evaluation of the Rietveld method for the mineralogical characterization of airborne dust in a mining area
Abstract In this article, we present the results of the mineralogical quantification of airborne dust from an urban area located in the Brazilian state of Minas Gerais in the vicinity of a gold mine. Three samples were collected at different points to assess spatial consistency. Results showed that the mineralogy, in relation to both major minerals and acces
REM, Int. Eng. J.. Publicado em: 2019-06