Ore Characterization
Mostrando 25-36 de 47 artigos, teses e dissertações.
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25. Influência da adição da lama fina de aciaria a oxigênio nas características físicas e microestruturais de pelotas queimadas de minério de ferro
At the Brazilian steelmaking industry, the estimated annual production of steelmaking BOF sludge is about 230 thousand tons. The BOF sludge is a residue typical of oxygen steel mills. The main chemical and granulometric characteristics of the steelmaking BOF sludge are the following: about 30% of BOF thick sludge, with high metallic content and granulometry
Publicado em: 2009
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26. CARACTERIZAÇÃO TECNOLÓGICA NO APROVEITAMENTO DO REJEITO DE MINÉRIO DE FERRO
In this work is presented the characterization of the fines, stocked in I dam as tailing, proceeding from the ore treatment iron of the plant of the Córrego do Feijão mine, that in the year of 2008 had been generated 1,479,157 t. In the technological characterization of the samples, are presented size distribution by humid sieving, chemical characterizatio
Publicado em: 2009
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27. IRON ORE CHARACTERIZATION BY COMPUTER VISION / CARACTERIZAÇÃO DE MINÉRIO DE FERRO POR VISÃO COMPUTACIONAL
Ore classification is useful for understanding and controlling industrial beneficiation processes. The present work contributes to the developement of a computer vision system for automated classification of iron ores by image analysis of optical micrographs. For this purpose, morphological feature extraction algorithms were implemented and feature based cla
Publicado em: 2008
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28. A METHOD FOR THE CHARACTERIZATION OF IRON ORE SINTER: DIGITAL MICROSCOPY AND IMAGE ANALYSIS / UMA METODOLOGIA PARA CARACTERIZAÇÃO DE SÍNTER DE MINÉRIO DE FERRO: MICROSCOPIA DIGITAL E ANÁLISE DE IMAGENS
In the present work, a method for the characterization of iron ore sinter, based on digital microscopy and image analysis is proposed. Iron ore sinters are multi-phase materials, with heterogeneous macro and micro structure. In general, the main phases are: hematite, magnetite, ferrites and silicates, besides pores. Employing an automated optical microscope,
Publicado em: 2008
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29. 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
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30. ESTUDO DA INTENSIDADE DE CREPITAÇÃO DE MINÉRIOS GRANULADOS DE MANGANÊS DO BRASIL
A common problem in the production of ferromanganese alloys is the lack of knowledge about the mineralogical and metallurgical properties of the manganese lump ores. An important quality parameter of the lump ores is the decrepitation, wich has not been studied adequately yet. This work presents a physical, chemical and mineralogical characterization of the
Publicado em: 2008
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31. CO-SITE MICROSCOPY: NEW POSSIBILITIES IN THE ORE CHARACTERIZATION / MICROSCOPIA CO-LOCALIZADA: NOVAS POSSIBILIDADES NA CARACTERIZAÇÃO DE MINÉRIOS
Computer-controlled microscopes with digital image acquisition and analysis led to the creation of a new field, called Digital Microscopy. Digital Microscopy not only allows a certain degree of automation but also has brought new possibilities to microstructural characterization. One of these new and promising possibilities is Co- Site Microscopy, that links
Publicado em: 2007
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32. Imobilização da enzima frutosiltransferase extracelular de Rhodotorula sp. e aplicação na produção de frutooligossacarideos. / Imobilization of extracellular enzyme fructosyltransferase from Rhodotorula sp. and application in fructooligosaccharides production.
Fructooligosaccharides (FOS) production by immobilized enzymes encloses two concepts that have faced great expansion in the last few years: industrial application of enzymes and functional foods. The option for enzyme immobilization is mainly induced by the easiness of controlling the reaction and the possibility of reusing the biocatalyst, besides the fact
Publicado em: 2007
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33. Critérios para avaliação da qualidade de sedimentos - Estudo de caso: Sub-bacia do Ribeirão Espírito Santo, afluente do Rio São Francisco / Criteria for evaluating sediment quality - Case Study: Sub-Watershed of Espírito Santo Stream; Affluent of the São Francisco River
Sediment Quality Values Guidelines (SQVG) have been used for evaluating ecological risk associated with the sediment contamination for benthonic organisms. The main objective of this work was to develop methodologies and to collect data that allowed the application of SQVG for the following metals: Cd, Cu, Pb, Ni and Zn. The location chosen for the case stud
Publicado em: 2007
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34. Rota de processo para o underflow da deslamagem de minério de ferro do concentrador da Samarco Mineração
The iron ore reverse cationic flotation process, using etheramine as a collector/frothing and corn starch as a depressor, is very important in all major Brazilian pellet-feed concentration plants. One of the major challenges found by these plants is the metallic recovery increase, whose main factor is the reduction of iron minerals loss on the froth or true
Publicado em: 2006
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35. "Processo Humifert para fertilizantes alternativos organo-fosfatados: obtenção a partir do minério de Angico dos Dias, caracterização dos compostos e avaliação da eficiência agronômica" / "Humifert process for alternative fertilizers organic-phosphates: obtaining starting from the ore of Angico dos Dias, characterization of the compounds and evalution of the agronomic efficiency"
O processo Humifert trata material fosfático e orgânico em um reator, com ácido nítrico nascente, para produzir compostos organo -fosfatados cuja solubilidade em P é maior que o material fosfático natural mas menor que os fertilizantes industriais tradicionais. É um processo alternativo de fabricação de fertilizantes que objetiva aproveitar materias
Publicado em: 2006
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36. Rota de processo para aproveitamento de rochas itabiríticas estéreis da Mina de Conceição
The improvement of materials with low grade is used more and more in the mineral industries. The CVRD in the 90s it began the concentration of the itabirite with the grade close 45% of iron in the Timbopeba Mine (Mariana, MG), producing 1,8 million tons a year (Mty) of pellet feed. Practicing mass recoveries close of 50%. The investigated material is dispose
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/04/2005