Mine Tailings
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. Estudo do comportamento geomecânico de resíduos de mineração / Study of the geomechanical behavior of tailings
A extração e processamento de minério resultam na geração de elevadas quantidades de resíduos, cuja disposição gera impacto e risco ambiental. O lançamento direto em reservatórios contidos por diques consiste na forma mais comum de disposição dos resíduos de mineração em superfície. Estes diques podem ser construídos por alteamentos sucessiv
Publicado em: 2010
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14. Analysis of Mercury-Rich plants and mine tailings using the Hydride-Generation AAS method
Um protocolo para análise do mercúrio (Hg) em amostras líquidas de solo e tecidos vegetais enriquecidos com Hg foi desenvolvido com base na técnica de geração de hidretos. O limite de detecção para este método foi de 11.4 ng/mL. A reproducibilidade do método (calculado com base no desvio padrão relativo) foi de 4.6%. A precisão do método foi ver
Brazilian Archives of Biology and Technology. Publicado em: 2009-08
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15. Evaluation of field performance of cover systems at Rio Paracatu Mine (RPM) / Avaliação de desempenho de sistemas de cobertura na mina Rio Paracatu Mineração (RPM)
In view of the RPM need to study soil covering systems and the scientific interest in those studies, two experimental evapotranspirative cover systems were projected and built, one with and, the other, without, a layer of capillary barrier, both with a monitoring system composed by superficial drainage meter, lisimeters to measure infiltration and geotechnic
Publicado em: 2008
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16. ANÁLISE DE MÚLTIPLAS VARIÁVEIS NO FECHAMENTO DE MINA ESTUDO DE CASO DA PILHA DE ESTÉRIL BF-4, MINA OSAMU UTSUMI, INB CALDAS, MINAS GERAIS.
The Osamu Utsumi belongs to Indústrias Nucleares do Brasil (INB), located in Caldas/MG, operated from 1982 to 1995, when the complete suspension of mining activities a processing of the uranium ore took place. Since then, the mine has an active maintaining system, which focus is the treatment of the acid drainage from the pit, waste dumps (locally called bo
Publicado em: 2007
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17. Revegetação de áreas mineradas: estudo dos procedimentos aplicados em minerações de areia. / Mining revegetation: methods and techniques used in sand mines.
This dissertation analyses the methods and techniques used to revegetate areas of sand mines and assess the results obtained. In the first phase of study, reclamation activities of five typical sand mines were observed. In general, revegetation in these mines plays a fundamental role in mined areas reclamation. Two mines were selected for a more detailed ass
Publicado em: 2003
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18. DESENVOLVIMENTO DE UMA CÉLULA TRIAXIAL CÍCLICA SERVO CONTROLADA E ESTUDO DA SUSCEPTIBILIDADE À LIQUEFAÇÃO DE UM RESÍDUO DA LAVRA DE MINERAÇÃO DE FERRO / DEVELOPMENT OF A SERVO-CONTROLLED CYCLIC TRIAXIAL CELL AND STUDY OF THE LIQUEFACTION SUSCEPTIBILITY OF TAILINGS FROM AN IRON MINING
This work presents results of na experimental research programme executed in the laboratory at PUC-Rio, Brazil. The aim of this research was investigated the stress-strain behaviour and the evaluation of the susceptibility of fine grained tailing material from Fernandinho Mine to liquefaction. This mine is at Quadrilatero Ferrífero (Minas Gerais - Brazil),
Publicado em: 1997
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19. Examination of Lipopolysaccharide (O-Antigen) Populations of Thiobacillus ferrooxidans from Two Mine Tailings
Net acid-generating capacities of 39.74 kg of H2SO4 per ton (ca. 0.05 kg/kg) (pH 2.68) for the Lemoine copper mine tailings (closed ca. 8 years ago; located 40 km west of Chibougamau, Quebec, Canada) and 16.07 kg of H2SO4 per ton (ca. 0.02 kg/kg) (pH 3.01) for the Copper Rand tailings (in current use and 50 km distant [east] from those of Lemoine) demonstrat
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20. Integron Diversity in Heavy-Metal-Contaminated Mine Tailings and Inferences about Integron Evolution
Integrons are horizontal gene transfer (HGT) systems containing elements necessary for site-specific recombination and expression of foreign DNA. The overall phylogenetic distribution of integrons and range of genes that can be transferred by integrons are unknown. This report contains an exploration of integrons in an environmental microbial community and a
American Society for Microbiology.
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21. Microbiological and Geochemical Characterization of Fluvially Deposited Sulfidic Mine Tailings
The fluvial deposition of mine tailings generated from historic mining operations near Butte, Montana, has resulted in substantial surface and shallow groundwater contamination along Silver Bow Creek. Biogeochemical processes in the sediment and underlying hyporheic zone were studied in an attempt to characterize interactions consequential to heavy-metal con
American Society for Microbiology.
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22. Enumeration of Thiobacilli within pH-Neutral and Acidic Mine Tailings and Their Role in the Development of Secondary Mineral Soil
The Lemoine tailings of Chibougamau, Quebec, Canada, were deposited as a pH-neutral mineral conglomerate consisting of aluminum-silicates, iron-aluminum-silicates, pyrite, chalcopyrite, and sphalerite. These tailings are colonized by an active population of Thiobacillus ferrooxidans which is localized to an acid zone occupying 40% of the tailings' surface. T
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23. Heavy Metal Coprecipitation with Hydrozincite [Zn5(CO3)2(OH)6] from Mine Waters Caused by Photosynthetic Microorganisms
An iron-poor stream of nearly neutral pH polluted by mine tailings has been investigated for a natural phenomenon responsible for the polishing of heavy metals in mine wastewaters. A white mineralized mat, which was determined to be hydrozincite [Zn5(CO3)2(OH)6] by X-ray diffraction analysis, was observed in the stream sediments mainly in spring. The precipi
American Society for Microbiology.
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24. Mineral surfaces and bioavailability of heavy metals: A molecular-scale perspective
There is a continual influx of heavy metal contaminants and pollutants into the biosphere from both natural and anthropogenic sources. A complex variety of abiotic and biotic processes affects their speciation and distribution, including adsorption onto and desorption from mineral surfaces, incorporation in precipitates or coprecipitates, release throug
The National Academy of Sciences.