Mineral Reserves
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. An alternative route to extract nickel and cobalt from non-commercial laterite ore
Abstract Laterite ores, which represent around two-thirds of nickel reserves, became an important source of nickel and cobalt metals. The objective of the present study was to investigate the efficiency of a hybrid route to extract nickel and cobalt present in a laterite ore sample which was not commercially attractive to be processed through the current rou
REM - International Engineering Journal. Publicado em: 2022
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2. Influence of Mn2+ ions on depression of quartz and spessartine in gondite ore
Abstract Low-grade manganese ores that are composed of manganese oxides, wad, quartz, iron oxides, gibbsite, and especially of spessartine (Mn3Al2(SiO4)3) are known as gondite. Spessartine is a mineral with a high content of silica (SiO2) and alumina (Al2O3) that causes a decrease of the enrichment in manganese oxide concentrates by flotation, giving this o
REM, Int. Eng. J.. Publicado em: 2021-01
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3. Serpentinites: Mineral Structure, Properties and Technological Applications
Serpentine is a versatile mineral family rich in Mg silicate with several polymorphic phases, mainly antigorite and lizardite, all of them with similar chemical composition (Mg3Si2O5(OH)4). Their structures are generally composed of octahedral layers rich in Mg[MgO2(OH)4]6- , attached to a tetrahedral silicate [Si2O5]2- sheet. The unique physicochemical prop
J. Braz. Chem. Soc.. Publicado em: 2020-01
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4. Rio Doce: riscos e incertezas a partir do desastre de Mariana (MG)
RESUMO Na Bacia Hidrográfica do Rio Doce, no Sudeste brasileiro, município de Mariana (MG), o rompimento da barragem de Fundão, em 5 de novembro de 2015, desencadeou o desastre da Samarco/Vale/BHP. O desastre não foi uma ocorrência natural, pois resultou da adoção de tecnologias e decisões técnico-administrativas, cujas responsabilidades criminais f
Rev. Bras. Hist.. Publicado em: 29/07/2019
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5. Field parametric geostatistics - An alternative to tackle gold grade estimations
Abstract High anomalous grades are very common in gold deposits, whose presence requires careful treatment to prevent overestimation of metal content. Mineral resource analysts have worked on the estimation of several gold deposits, and none of the classical methods were able to avoid manual interventions, such as cutting high grades for local estimation or
REM, Int. Eng. J.. Publicado em: 2019-03
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6. Reaction of popcorn lines (s7) cultivated in distinct phosphorus levels to Bipolaris maydis infection
RESUMO O milho-pipoca apresenta alta suscetibilidade a helmintosporiose (Bipolaris maydis) (h-Bm). O melhoramento genético desta cultura deve priorizar a resistência a h-Bm e desenvolver cultivares que ofereçam maior sustentabilidade ao cultivo, principalmente em solos com escassez de fósforo (P). O P-mineral normalmente é suprido à cultura do milho pe
Summa phytopathol.. Publicado em: 2019-03
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7. The Quest for land at Piranema sand cluster
Abstract The Piranema Sand Cluster, located between the Seropédica and Itaguaí counties of Rio de Janeiro Metropolitan Region, is responsible for 65% of the sand used in construction works of the region and is the home of approximately 47 small mining companies. The construction works in progress in this area make this mining district a critical success fa
REM, Int. Eng. J.. Publicado em: 2018-07
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8. Corrosiveness of Brazilian Candiota Coal
ABSTRACT Candiota city, in the south of Brazil, is located near the largest reserves of mineral coal of the country. This coal is used for thermoelectric power generation. The extraction of coal from open-cut mines involves operations may generate at least some particulate matter into the atmosphere. These particles retained on the surface of metallic struct
Matéria (Rio J.). Publicado em: 2015-12
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9. Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of "Podbracan"
Mining projects for mineral resource mining contain in certain cases specific technical and technological solutions, these being the result of the mine’s characteristic spatial position and the geometry of the ore deposit, existing mining works, structures, and terrain relief etc. For the purpose of completion of the mining project, it is necessary to carr
Rem: Rev. Esc. Minas. Publicado em: 2015-09
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10. Analysis of the economic feasibility of a mining project due to the presence of natural underground cavities
The legislation for the protection and conservation of caves is recent in Brazil. In 2008, the Decree 6.640 was enacted and in 2009, the Normative Instruction Nº 2 by the Brazilian Environment Ministry (MMA, Portuguese acronyms) was published. Mining operations cause a significant impact on the caves when they are present in or next to the mineral body. The
Rem: Rev. Esc. Minas. Publicado em: 2015-09
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11. Incorporação da variabilidade dos teores para análise de risco de recursos minerais e sequenciamento de lavra
Mining industry continuously investigates proper reconciliation procedures and techniques for mapping possible risks in ore recovery and mine planning. A case study at a Brazilian copper mine investigates the adequacy of using simulated grades for defining high risk areas affecting mine planning and the defined mineral reserves. Conditional simulations were
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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12. FARELOS DE ARROZ DESFITINIZADOS NA NUTRIÇÃO DE JUNDIÁ (Rhamdia quelen) / DEPHYTINIZED DEFATTED RICE BRAN IN SILVER CATFISH (Rhamdia quelen) NUTRITION
This survey was conducted for the purpose of evaluating the performance, metabolism, bone mineral deposition and phosphorus excretion in feces of Rhamdia quelen juvenile fed with defatted rice bran which phytic acid was extracted or degraded. The experiments for evaluating the performance and metabolism and fecal collection were conducted in recirculating wa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2011