Bioleaching
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Removal of entrained organic matter in the copper electrolyte by ozonation
Abstract Organic matter-in-aqueous entrainment is a serious problem in the hydrometallurgical extraction of copper from ore. Current inefficiencies, changes in the morphology and orientation of cathode deposit are some of the problems when organic matter is present in the advance electrolyte. In addition, negative effects upon metabolic activity of bioleachi
REM, Int. Eng. J.. Publicado em: 2019-03
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2. BIOLEACHING OF METALS FROM A SPENT DIESEL HYDRODESULFURIZATION CATALYST EMPLOYING Acidithiobacillus thiooxidans FG-01
Abstract This study evaluates the recovery of heavy metals employing a spent catalyst from the hydrodesulfurization (HDS) of diesel, with no chemical, thermal or physical pretreatment, using the bacterial strain Acidithiobacillus thiooxidans FG-01. Direct and indirect bioleaching tests were carried out in Erlenmeyer flasks (500 mL). The influence of the pulp
Braz. J. Chem. Eng.. Publicado em: 2017-01
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3. Bioleaching of gold, copper and nickel from waste cellular phone PCBs and computer goldfinger motherboards by two
Aspergillus niger strainsIn an effort to develop alternate techniques to recover metals from waste electrical and electronic equipment (WEEE), this research evaluated the bioleaching efficiency of gold (Au), copper (Cu) and nickel (Ni) by two strains of
Aspergillus niger in the presence of gold-plated finger integrated circuits found in computer motherboards (GFIBraz. J. Microbiol.. Publicado em: 2015-09
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4. Processes for phosphorus removal from iron ore - a review
This paper aims at reviewing literature on the occurrence of phosphorus in iron ores from the mines around the world. The review extends to the phosphorus removal processes of this mineral to meet the specifications of the steel industry. Phosphorus is a contaminant that can be hard to remove, especially when one does not know its mode of occurrence in the o
Rem: Rev. Esc. Minas. Publicado em: 2015-09
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5. Bacterial consortium for copper extraction from sulphide ore consisting mainly of chalcopyrite
The mining industry is looking forward for bacterial consortia for economic extraction of copper from low-grade ores. The main objective was to determine an optimal bacterial consortium from several bacterial strains to obtain copper from the leach of chalcopyrite. The major native bacterial species involved in the bioleaching of sulphide ore (Acidithiobacil
Braz. J. Microbiol.. Publicado em: 20/08/2013
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6. Biolixiviação de sulfetos secundários de cobre a partir da utilização de micro-organismos termófilos extremos / Biolixiviação de sulfetos secundários de cobre a partir da utilização de micro-organismos termófilos extremos
A produção de cobre metálico, a partir de seus minérios, é dependente do tipo de mineral no qual o elemento se encontra. Os sulfetos de cobre, por exemplo, podem ser processados tanto por rota hidrometalúrgica quanto pirometalúrgica. Atualmente, a rota hidrometalúrgica responde por cerca 20% da produção mundial de cobre e o esperado é que este nú
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/05/2011
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7. Biolixiviação de Sulfetos Secundários de Cobre por Sulfobacillus thermosulfidooxidans / Biolixiviação de Sulfetos Secundários de Cobre por Sulfobacillus thermosulfidooxidans
Os processos bio-hidrometalúrgicos têm sido aplicados, com sucesso, no tratamento de minérios de baixo teor e de rejeitos de mineração. Neste trabalho, foi estudada a biolixiviação de dois minérios secundários de cobre, utilizando uma cepa de Sulfobacillus thermosulfidooxidans (DSMZ 9293) com o objetivo de determinar os parâmetros ideais para extra
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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8. A novel acidophilic, thermophilic iron and sulfur-oxidizing archaeon isolated from a hot spring of tengchong, yunnan, China
A novel thermoacidophilic iron and sulfur-oxidizing archaeon, strain YN25, was isolated from an in situ enriched acid hot spring sample collected in Yunnan, China. Cells were irregular cocci, about 0.9-1.02 µm×1.0-1.31 µm in the medium containing elemental sulfur and 1.5-2.22 µm×1.8-2.54 µm in ferrous sulfate medium. The ranges of growth and pH were 50
Brazilian Journal of Microbiology. Publicado em: 2011-06
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9. Analise da expressão de genes que codificam proteinas transportadoras em Acidithiobacillus ferrooxidans e Acidithiobacillus thioxidans na presença de sulfetos metalicos / Expression analyses of genes that encode for transporter protein in Acidithiobacillus ferrooxidans and Acidithiobacillus thioxidans maintained in contact with metal sulphiides
Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans are acidophilic, chemolitotrophic and mesophilic bacteria found in bioleaching environments. A. ferrooxidans uses ferrous iron and sulphur compounds as an e1ectron donor and A. thiooxidans uses on1y sulphur and sulphur compounds. Both species are aerobic using oxygen as final e1ectron acceptor.
Publicado em: 2008
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10. Identificação e caracterização de genes expressos diferencialmente em Acidithiobacillus ferrooxidans na presença de sulfetos metalicos / Identification and characterization of differentially expression genes in Acidithiobacillus ferrooxidans in the presence of metal sulfides
Acidithiobacillus ferrooxidans is a Gram-negative, mesophilic, acidophilic, chemolithoautotrophic bacterium that obtains energy from the oxidation of ferrous iron, elemental sulfur and reduced sulfur compounds. A. ferrooxidans is one of the most used microorganisms in bioleaching, an industrial process used for the recovery of copper, uranium or gold, fiom l
Publicado em: 2008
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11. Estudo da dissolução oxidativa microbiológica de uma complexa amostra mineral contendo pirita (FeS2), Pirrotita (Fe1-xS) e Molibdenita (MoS2)
This work aims to study the oxidation of a complex molybdenite mineral which contains pyrite and pyrrotite, by Acidithiobacillus ferrooxidans. This study was performed by respirometric essays and bioleaching in shake flasks. Respirometric essays yielded the kinetics of mineral oxidation. The findings showed that sulfide oxidation followed classical Michaelis
Química Nova. Publicado em: 2007-10
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12. Processo integrado: biolixiviação e lixiviação química na indústria do zinco
This study is aimed to review existing processes to produce zinc metal and evaluate parameters of bio and direct leaching of zinc sulfide concentrates. The experiments, carried out in bench scale, continuous and batch tests, have objective to investigate several parameters during the bioleaching and chemical leaching of zinc concentrates from Votorantim Meta
Publicado em: 2005