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Dissertations / Theses on the topic 'Bioleaching'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Jonglertjunya, Woranart. "Bioleaching of chalcopyrite." Thesis, University of Birmingham, 2003. http://etheses.bham.ac.uk//id/eprint/238/.

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This research is concerned with the bioleaching of chalcopyrite (CuFeS\(_2\)) by Thiobacillus ferrooxidans (ATCC 19859), which has been carried out in shake flasks (250 ml) and a 4-litre stirred tank bioreactor. The effects of experimental factors such as initial pH, particle size, pulp density and shake flask speed have been studied in shake flasks by employing cell suspensions in the chalcopyrite concentrate with the ATCC 64 medium in the absence of added ferrous ions. The characterisation of T. ferrooxidans on chalcopyrite concentrate was examined by investigating the adsorption isotherm an

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2

Breed, Ashley Wayne. "Studies on the mechanism and kinetics of bioleaching with special reference to the bioleaching of refractory gold-bearing arsenopyrite." Doctoral thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/5356.

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Includes bibliographies.<br>Bioleaching is now an established technology for the leaching of whole-ore copper heaps and the pre-treatment of refractory arsenical gold ores and concentrates. For the case of refractory arsenical gold concentrates, it offers an economically feasible alternative to pressure oxidation and has environmental advantages over roasting with regard to the quality of the liquid and gaseous effluent (Van Aswegen, 1993). The major disadvantage of bioleaching is the low residence time required to achieve high oxidation levels. Other potential complications include the solubi

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3

Khoshkhoo, Mohammad. "Chalcopyrite Dissolution in Sulphate-Based Leaching and Bioleaching Systems." Licentiate thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17698.

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Chalcopyrite (CuFeS2) is the most abundant and the most economically important copper mineral. Increasing worldwide demand for copper accompanied by exhaustion of copper resources necessitate the development of new processes for treating lower-grade copper ores. Heap (bio)leaching of copper oxides and secondary sulphides (covellite (CuS) and chalcocite (Cu2S)) is a proven technology and a convenient process due to its simplicity and relatively low capital investment requirement. As a result, the technology appears to be an attractive process option for treatment of low-grade chalcopyrite ores

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4

Ogbonna, Nneoma. "Mathematical modelling of agglomerate scale phenomena in heap bioleaching." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/24385.

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Bioleaching is a naturally occurring process that has been harnessed in metal recovery from low grade ores. The heap bioleaching technique involves complex interactions between chemical reactions, microbial processes and transport processes. The need for efficient heap operations has led to the scientific investigation of heap bioleaching and the development of mathematical models for the process. Over time, the focus of heap leach modelling has moved from models that emphasize particle scale processes to models that emph8size bulk scale processes. In many cases however, the particle scale eff

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5

Blauth, Pricila Lidiane. "Oxidação da calcopirita (CuFe S'IND.2') por Acidithiobacillus ferooxidans em presença de cisteína e de Acidithiobacillus thiooxidans /." Araraquara : [s.n.], 2008. http://hdl.handle.net/11449/88046.

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Resumo: O processo de biolixiviação é a utilização de bactérias, para a solubilização dos metais presentes em sulfetos minerais. As espécies mais estudadas são o Acidithiobacillus thiooxidans e o Acidithiobacillus ferrooxidans, embora outras espécies também participem do processo. Esse processo é aplicado há muito tempo, mas somente nos anos 1950 a participação de microorganismos foi descoberta. A biolixiviação de cobre é um exemplo de aplicação industrial, embora outros metais como ouro, urânio e o níquel, venham sendo obtidos por esse método. A calcopirita (CuFeS2) é o mais abundante mineral

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6

Cameron, Rory. "Bioleaching of low-grade nickel sulphide ore at elevated pH." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19784.

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This thesis examines the bioleaching of six different Canadian nickel sulphide ores at pH levels above what is generally considered optimum (~ 2). The majority of work discussed in this thesis was conducted with a low-grade metamorphosed ultramafic nickel sulphide ore from Manitoba, Canada (Ore 3), which is not currently exploitable with conventional technologies. The ore contains 21% magnesium and 0.3% nickel. Nickel is the only significant metal value, and is present primarily as pentlandite. A substantial fraction of the magnesium is present as the serpentine mineral lizardite, making proce

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7

Potysz, Anna. "Copper metallurgical slags : mineralogy, bio/weathering processes and metal bioleaching." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1201/document.

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Les principaux objectifs étaient d'évaluer la stabilité de l'environnement des scories métallurgiques de Cu résultant de différentes périodes d'activités industrielles et de différentes technologies de fusion. Parmi les scories étudiées, on retrouve: les scories historiques cristallines (SH) ainsi que modernes: les scories de four vertical (SFS), les scories granulées (GS) et les scories de plomb (LS). Les différentes approches adoptées dans ce travail de thèse ont tenu compte de: i) la composition chimique et la phase minérale des scories, ii) la sensibilité à la lixiviation des scories sous

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8

Bouzalakos, Steve. "Controlled Low-Strength Materials Containing Solid Waste from Minerals Bioleaching." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/4265.

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Sustainable treatment and disposal of mine waste is a serious environmental issue faced by the mining industry worldwide. Conventional methods of mine waste management predominantly involve indefinite retention in engineered tailings dams. The cost and liability of such surface storage facilities have increased significantly in recent years as an outcome of stringent environmental legislation and mine closure requirements gradually transforming the economics of mine waste disposal. Backfill methods, particularly cemented paste backfill, are increasingly perceived as sustainable, environmentall

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9

Nimah, Ulfa. "Investigation of Secondary Reactions in Bioleaching of Nickel Laterite Ores." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/21124.

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This thesis investigated the impact of secondary reactions; adsorption and precipitation, on nickel and cobalt recovery from bioleaching of nickel laterite ores. Although bioleaching is considered an ecologically and energy friendly technique to process laterite ores, low recoveries of target metals have inhibited its commercialisation. The secondary reactions occurrence in bioleaching of limonite, fresh and weathered saprolite ores was verified by performing chemical leaching tests using sulphuric and citric acid that would be generated by chemolithotrophs and heterotrophs respectively. The f

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10

Togamana, Culwick. "The evaluation of the stability of metalliferrous tailings by chemical and microbiological leaching." Thesis, University of Exeter, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388592.

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11

Deveci, Haci. "Bacterial leaching of complex zinc/lead sulphides using mesophilic and thermophilic bacteria." Thesis, University of Exeter, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341175.

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12

Benzal, Montes Eva. "Study and optimisation of copper bioleaching process for electronic waste valorisation." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/671694.

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In the current economical context, the use of waste material with economic potential should be a priority. In this sense, the increasing production of electrical and electronic equipment waste (WEEE) makes these materials a potential source for valuable and scarce metals. For this reason, it is important to develop new metal recovery methodologies economically that are more profitable, sustainable and environmental friendly. A possible solution to this problem is to take advantage of the metabolic activity of certain microorganisms, mainly bacteria, to regenerate the responsible agents for the

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13

Liang, Xinjin. "Geomycology : fungal bioweathering, bioleaching, bioprecipitation and biotransformation of metals and minerals." Thesis, University of Dundee, 2015. https://discovery.dundee.ac.uk/en/studentTheses/9cd2368e-e4fc-4436-aa8a-1eaebc2d5a57.

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Fungi play important geoactive roles in the biosphere, particularly element biotransformations and biogeochemical cycling, metal and mineral transformations, decomposition, bioweathering, and soil and sediment formation. Fungi can apply various mechanisms to effect changes in metal speciation, toxicity and mobility, mineral formation and/or mineral dissolution. This research has examined fungal roles in bioweathering and bioleaching of zinc sulfide ore, together with an investigation of the role of fungal phosphatases in the bioprecipitation of uranium and lead when utilising an organic phosph

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14

Ngoma, I.-Muaka Emmanuel. "Investigating the effect of acid stress on selected mesophilic bioleaching microorganisms." Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/917.

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Thesis submitted in accomplishment of the requirements of the Magister Technologiae in Engineering degree, Department of Chemical Engineering, Cape Peninsula University of Technology 2015<br>Heap bioleaching is a microbially-assisted hydrometallurgical metal extraction process in which metals are solubilised from low grade ore by ferric iron and acid leach agents. Particularly for low grade ores, heap bioleaching provides several advantages over conventional technologies, it is simpler and safer to operate with low capital and operation cost and acceptable recoveries. Key challenges with h

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15

Archer, Karen H. L. "Potential of thermophilic bioleaching, effect of temperature on the process performance." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/9504.

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Includes bibliographies.<br>Bioleaching is a biohydrometallurgical process whereby mineral sulphides are metabolically oxidised by microorganisms, releasing precious metals encapsulated in them. This pre-treatment is based on the action of microorganisms affecting oxidation of reduced sulphur species and ferrous iron to sulphate and ferric iron respectively. Conventionally Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans are implemented in this process in the region of 40-45Â°C and pH 1.8. A high temperature (65- 800C) process, utiltising thermophilic archaea

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16

Arena, Fabiana Antonia [UNESP]. "Estudos físico-químicos e de lixiviação de calcopirita (CuFeS.IND.2) por Acidithiobacillus ferrooxidans." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/88027.

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Made available in DSpace on 2014-06-11T19:23:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-18Bitstream added on 2014-06-13T20:50:00Z : No. of bitstreams: 1 arena_fa_me_araiq.pdf: 2197668 bytes, checksum: 297f2970ca1cb056987adecc0750b426 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>A mineração é um dos segmentos mais importantes da economia por estar diretamente relacionada à obtenção de metais de base destinados a diversos tipos de indústrias. No entanto, os resíduos da atividade mineralógica tem se tornado um crescente problema ambiental, pr

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17

Ho, Lock Delia. "Aplicaciones en la biometalurgia." Revista de Química, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/99607.

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El presente trabajo experimental tuvo dos partes: La primera, fue la biolixiviación de tres minerales sulfurados utilizando como agente de biol ixivi ación microorganismos pertenecientes al género de los Acidithiobacil/us. El objetivo primordial es mostrar la capacidad lixiviadora de la bacteria y su aplicación comercial. En la segunda parte se utilizó un mineral refractario de oro para realizar un estudio de liberación del oro de su matriz<br>Biometallurgical applicationsThe present work had two parts: First, it was the bioleaching of three sulfide minerals using Acidithiobacillus microorgani

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18

Krok, Beate Agnes [Verfasser], and Wolfgang [Akademischer Betreuer] Sand. "Microcalorimetric Investigations on Copper Sulfide Bioleaching / Beate Agnes Krok. Betreuer: Wolfgang Sand." Duisburg, 2016. http://d-nb.info/1090785496/34.

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19

Drossou, Marianna. "The kinetics of the bioleaching of a refractory gold-bearing pyrite concentrate." Master's thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/23206.

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20

Shaik, Kathija. "Formation of thiocyanate in bioleaching residues and its effect in PGM recovery." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20488.

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A recent study investigated the feasibility of a sequential heap leach in low grade Platreef ore in order to recover PGMs (Platinum Group Metals), by a pure hydrometallurgical route. This method comprised of two stages, an initial thermophile bioleach stage to extract base metals followed by a cyanide leach to recover precious metals, PGMs. The study conducted assessed the possibility of excluding costly stages such as concentration by flotation, smelting and pressure leaching by directly leaching low grade Platreef ore. The findings showed successful base metal recoveries; however, the produc

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Hong, Young. "Bioleaching of Gold and Copper from Electronic Waste Using Sulphate Reducing Bacteria." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/20960.

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This thesis examined a novel hybrid method to recover gold and copper from electronic waste (e-waste) based on combination of biological and chemical generation of thiosulphate reagent. E-waste is growing waste stream rich with copper and gold. Thiosulphate is an effective leaching reagent to recover these metals however it is hampered by high cost deeming it economically unfeasible. Currently there are no alternative technologies that are able to overcome this limitation. To establish the need for this new hybrid method, we examined the economics of e-waste and current available technologies.

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22

Zhu, Zeying. "Utilization of Coal Through Microbial Electrolysis Cell (MEC) Systems And Bioleaching Approach." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2366.

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Coal is becoming more important both as an energy source and as the source of organic chemical feedstock in the 21st century. Combustion of coal certainly generates electricity; however, it is not sustainable for the current global energy crisis. More eco-friendly, sustainable ways of utilizing coal, need to be investigated. This study focuses mainly on biochemical conversion and bioleaching approaches. Burning coal will release toxic chemicals to impact the environment. It has greatly increased the level of carbon dioxide (CO2) in the air. Due to increasing concern of CO2, the first part of t

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Viegas, Debora Maria Alves [UNESP]. "Avaliação da cinetica bacteriana na biolixiviação de calcopirita." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/138847.

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Arena, Fabiana Antonia. "Estudos físico-químicos e de lixiviação de calcopirita (CuFeS.IND.2) por Acidithiobacillus ferrooxidans /." Araraquara : [s.n.], 2010. http://hdl.handle.net/11449/88027.

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Resumo: A mineração é um dos segmentos mais importantes da economia por estar diretamente relacionada à obtenção de metais de base destinados a diversos tipos de indústrias. No entanto, os resíduos da atividade mineralógica tem se tornado um crescente problema ambiental, principalmente quando os mesmos são sulfetos minerais altamente refratários. A calcopirita (CuFeS2) é um dos sulfetos minerais de baixo teor mais abundantes na natureza devido à sua elevada refratariedade, ocasionada por motivos ainda controversos na literatura. Dentre as várias razões propostas para a refratariedade da calcop

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25

Gahan, Chandra Sekhar. "Comparative study on different industrial oxidic by-products as neutralising agent in bioleaching." Licentiate thesis, Luleå : Luleå University of Technology, 2008. http://epubl.ltu.se/1402-1757/2008/19/.

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Vries, Eustice. "Effects of intermittent irrigation on the extraction of copper from heap bioleaching systems." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/11355.

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Includes bibliographical references.<br>The use of microorganisms for the regeneration of leach agents in the heap leaching of mineral sulfide ores is finding increasing application as a hydrometallurgical unit operation applicable to the treatment of the increasing low grade ores. These same microorganisms contribute to the formation of acid rock drainage (ARD) through the oxidation of base metal sulfides, particularly pyrite. In this research, the effect of intermittent irrigation on the extraction of copper and iron from a low grade chalcopyrite ore in the heap bioleaching system is investi

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27

Jaffer, Ashraf. "An investigation into the mechanism of bioleaching of a predominantly-chalcopyrite concentrate with mesophiles." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/5313.

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Includes bibliographical references.<br>Bioleaching is an established technology for the treatment of refractory gold ores and concentrates. The bioleaching of sulphide minerals is a complex process in which bacterial and chemical oxidation processes occur simultaneously. Recent studies has provided convincing evidence that the bioleaching of pyrite occurs via a two-step mechanism (Boon, 1996).

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Khaleque, Himal Nahreen. "Acidihalobacter: Novel Halotolerant Iron- and Sulfur-oxidizing Acidophiles with Potential for Saline Water Bioleaching." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/66045.

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Members of the Acidihalobacter genus are halotolerant, iron- and sulfur-oxidizing acidophiles that have potential in saline water bioleaching in areas where waters and ores contain high levels of chloride ion. In this study, the characterization and classification of novel members of the Acidihalobacter genus was undertaken in order to gain a better understanding of the metabolic processes and stress tolerance mechanisms these unique microorganisms use in order to survive acid and salt stress simultaneously.

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Jang, Hee-Chan. "Developing bacterial fungal consortia for biomining of low-grade saprolitic nickel laterite minerals." Thesis, The University of Sydney, 2020. https://hdl.handle.net/2123/25478.

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This study investigated the development of a novel bacterial fungal interaction (BFI) technology involving co-growth of sulphur oxidising bacteria, Acidithiobacillus thiooxidans, and fungi Aspergillus niger. The bacterial fungal consortia (BFC) have unique synergistic properties that could improve the conventional hydrometallurgical processing of Nickel (Ni) and Cobalt (Co) from low-grade Ni saprolitic laterites. The key challenge in this is the lack of research and understanding of their BFI as co-growth of mixed strains of such types have not been attempted before. To investigate the potenti

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Mikkelsen, Deirdre. "The development and use of molecular phylogenetic and microscopy methods to study thermophilic bioleaching cultures /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18580.pdf.

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Gu, Xiangyang. "Improving heavy metal bioleaching efficiency through microbiological control of inhibitory substances in anaerobically digested sludge." HKBU Institutional Repository, 2003. http://repository.hkbu.edu.hk/etd_ra/504.

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Lobos, Aldo. "Bioleaching Potential of Filamentous Fungi to Mobilize Lithium and Cobalt from Spent Rechargeable Li-Ion Batteries." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/7051.

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Demand for lithium (Li) and cobalt (Co) is on the rise, due in part to their increased use in rechargeable Li-ion batteries (RLIB). Current recycling processes that utilize chemical leaching efficiently recover in Li and Co from the cathode material in spent batteries; however, these processes are costly and emit hazardous waste into the environment. Therefore, a more sustainable process for recycling Li and Co is needed, and bioleaching may provide a solution. Fungal bioleaching has been shown in previous studies to effectively mobilize metals (Pb, Al, Mn, Cu, and Zn) f

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Jeevaratnam, Elizabeth Geethika. "An investigation into the ferric leaching of chalcopyrite : a sub-process in the bioleaching of chalcopyrite." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/13957.

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Bibliography: leaves 70-79.<br>The current focus of research in the UCT Minerals Bioprocessing Research Unit is to develop an understanding of the chalcopyrite bioleaching sub-processes. This thesis forms part of the greater study on bioleaching, investigating the ferric leaching subprocess. The objective of this thesis was two-folds. Firstly, a detailed literature review was undertaken to develop a better understanding of the ferric leaching of chalcopyrite and the cause of passivation during chalcopyrite leaching. Secondly, leach experiments on pyrite were used to establish the applicability

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Sissing, Ashley A. "An investigation into the effect of solid particulate phase on the bioleaching performance of Sulfolobus metallicus." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/13958.

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Includes bibliographical references.<br>Gold-bearing refractory sulphidic ores require a pretreatment process before extraction of the valuable metal, may be carried out. Bioleaching of the mineral may be used as pretreatment. Further mineral bioleaching may be used to liberate base metals such as copper from refractory sulphidic ores. The microorganisms used in the high intensity tank-based commercial biohydrometallurgy processes are mainly mesophiles, although moderate thermophiles are currently used at Youanmi Mine in Australia (Brierley, 1997). Extreme thermophiles have been found to exhib

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Raja, Sashnee B. "The effect of particulate-induced hydrodynamic stress on the bioleaching of chalcopyrite by a Sulfolobus sp." Doctoral thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/5413.

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Includes bibliographical references.<br>In slurry reactors, hydrodynamic stress originates primarily from interactions between particles and cells in the reactor. This form of stress has been shown to negatively affect the process performance. The present study centres on slurry reactors utilised in the bioleaching industry. The micro-organisms employed in these processes include mesophilic micro-organisms and, more recently, thermophilic microbes which have shown much promise for improving the rate and extent of leaching particularly of recalcitrant minerals such as chalcopyrite. The drawback

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Melo, Wanessa de Cássia Martins Antunes de [UNESP]. "Biossolubilização da calcopirita na presença dos íons cloreto e ácidos orgânicos." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/87993.

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Francisco, Junior Wilmo Ernesto [UNESP]. "Estudo da oxidação de covelita (CuS) e molibdenita (MoS2) sintéticas por Acidithiobacillus ferrooxidans." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/88034.

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Made available in DSpace on 2014-06-11T19:23:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-01-27Bitstream added on 2014-06-13T19:08:56Z : No. of bitstreams: 1 franciscojr_we_me_araiq.pdf: 572574 bytes, checksum: 2c57de58f563457427fe3f4ad3a05e17 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>A lixiviação bacteriana, ou biolixiviação é um processo biotecnológico que se fundamenta na utilização de microorganismos capazes de solubilizar metais pela oxidação de sulfetos metálicos, sendo nos dias atuais, uma das mais importantes alternativas para a extr

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Linton, Patricia E. "Isolation of salt-tolerant, iron-oxidising, acidophilic bacteria and assessment of their bioleaching potential at high salinity." Thesis, Heriot-Watt University, 2003. http://hdl.handle.net/10399/304.

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van, Zyl Andries Wynand. "An investigation into the effects of preleach time period, nitrogen supplementation and iron concentration on bioleaching performance." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5388.

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Includes abstract.<br>Includes bibliographical references (leaves 69-75).<br>Bioleaching has developed into a very important process for the recovery of valuable metals, particularly from low grade copper ores due to the ever increase in demand. A lag phase is present during the start-up phase of heap bioleach operations characterised by a low degree of microbial colonisation, a low ferrous iron oxidation rate and low microbial proliferation rates, ultimately resulting in a poor copper recovery rate.

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Chan, Lau Chi. "Bioleaching of heavy metals from anaerobically digested sewage sludge using isolated indigenous iron- and sulphur-oxidizing bacteria." HKBU Institutional Repository, 2001. http://repository.hkbu.edu.hk/etd_ra/279.

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Ginige, Pushpa. "Decontamination of biosolids for land application : metals bioleaching and process impacts on the nutrient value of biosolids." Thesis, Queensland University of Technology, 1998.

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Makaula, Didi Xhanti. "Developing quantitative approaches to determine microbial colonisation and activity in mineral bioleaching and characterisation of acid rock drainage." Doctoral thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/31404.

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Colonisation of mineral surfaces by acidophilic microorganisms during bioleaching is important for accelerating the extraction of valuable metals from mineral sulfide ores of varying grades through biohydrometallurgy. It also influences acid formation and mineral deportment from sulfidic waste rock generated in mining processes and is key to its comprehensive waste rock characterisation for acid forming potential. This study assesses mixed mesophilic microbial interactions with, and colonisation of, pyrite concentrates and pyrite bearing waste rocks. The assessment of these interactions was ca

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Kotsiopoulos, Athanasios. "Development of an unsteady state model for the tank bioleaching of sulphide mineral concentrates in flow reactor systems." Doctoral thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/10849.

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Includes bibliographical references.<br>In this thesis, it is hypothesized that in bioleaching flow reactor systems, high reaction rate regions exist that can be maintained by application of biological stress trajectories. Reactor models are developed for the purpose of optimising plant operation, understood here as maximising the production rate. Complicating this attempt are a) the non-linear dynamics associated with the kinetics and b) the primary reaction's being multiphase. Mathematical models are developed to establish which particle parameters are necessary to describe reactor performan

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Pereira, Laize Fernanda [UNESP]. "Dessulfurização microbiana de carvão contendo enxofre pirítico em escala de bancada." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/144309.

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Submitted by Laíze Fernanda Pereira null (laize_fernandapereira@yahoo.com.br) on 2016-10-03T11:51:03Z No. of bitstreams: 1 Dissertação Laize Fernanda Pereira_versão final.pdf: 1765685 bytes, checksum: c480da42091df39cbc80f15e56710bec (MD5)<br>Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-10-05T17:05:35Z (GMT) No. of bitstreams: 1 pereira_lf_me_araiq.pdf: 1765685 bytes, checksum: c480da42091df39cbc80f15e56710bec (MD5)<br>Made available in DSpace on 2016-10-05T17:05:35Z (GMT). No. of bitstreams: 1 pereira_lf_me_araiq.pdf: 1765685 bytes, checksum

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Gituma, Mark Kinoti. "Investigating ferric ion production and consumption trends in a simulated e-waste bioleaching environment for maximum metal dissolution efficiency." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22920.

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Electrical and electronic equipment has become an integral part of life in the modern world. When disposed of, it is termed Waste Electrical and Electronic Equipment (WEEE) and is one of the fastest growing waste streams in the world. Disposing the WEEE has associated risks as they contain a high amount of toxic metals (e.g. lead) which can leach into the soil, they place a high load on the land and they contain valuable metals making their recovery beneficial. Printed circuit boards (PCBs) are an essential part of WEEE. Although WEEE forms a small part of the waste stream (3 %), it contains a

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Blauth, Pricila Lidiane [UNESP]. "Oxidação da calcopirita (CuFe S'IND.2') por Acidithiobacillus ferooxidans em presença de cisteína e de Acidithiobacillus thiooxidans." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/88046.

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Made available in DSpace on 2014-06-11T19:23:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-06-25Bitstream added on 2014-06-13T20:29:53Z : No. of bitstreams: 1 blauth_pl_me_araiq.pdf: 654230 bytes, checksum: 375b010d54db4dec31791d9f37af0777 (MD5)<br>Outros<br>O processo de biolixiviação é a utilização de bactérias, para a solubilização dos metais presentes em sulfetos minerais. As espécies mais estudadas são o Acidithiobacillus thiooxidans e o Acidithiobacillus ferrooxidans, embora outras espécies também participem do processo. Esse processo é aplicado há muito tempo, mas somente

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Chéron, Jonathan. "Study of the bacterial microenvironment in a bioleaching stirred tank bioreactor : transport phenomena and kinetic modelling in three-phase flow." Electronic Thesis or Diss., Université de Lorraine, 2021. http://docnum.univ-lorraine.fr/public/DDOC_T_2021_0237_CHERON.pdf.

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La biolixiviation extractive est un ensemble de technologies visant à récupérer les métaux contenus dans les ressources minérales via l'assistance de microorganismes. Ces technologies ont été mises en œuvre avec succès à l'échelle industrielle et utilisées, soit sous la forme de traitements en tas, soit en utilisant des réacteurs à cuve agitée à grande échelle. Récemment, la biolixiviation a évolué vers l'exploitation de ressources non communes (très faibles teneurs, minéralogie complexe ou forte teneur en soufre) causée par la tendance à la baisse des teneurs moyennes en métaux contenus dans

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Sethurajan, Manivannan. "Metallurgical sludges, bio/leaching and heavy metals recovery (Zn, Cu)." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1202/document.

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Ce travail de recherche a été réalisé dans le but de développer une technologie pour démontrer le potentiel des résidus métallurgiques comme une source secondaire de métaux lourds (Cu et Zn). Trois résidus de lixiviation de zinc différents (en fonction de leur âge de génération et de dépôt) (ZLR1, ZLR2 & ZLR3) et des résidus d'épuration de zinc (ZPR) ont été recueillis sur un site industriel de la métallurgie du zinc localisé au Brésil. Les échantillons de ZLRs et ZPR ont été analysé pour déterminer leurs caractéristiques minéralogiques et physico-chimiques. Le fractionnement de métaux lou

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Francisco, Junior Wilmo Ernesto. "Estudo da oxidação de covelita (CuS) e molibdenita (MoS2) sintéticas por Acidithiobacillus ferrooxidans /." Araraquara : [s.n.], 2006. http://hdl.handle.net/11449/88034.

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Resumo: A lixiviação bacteriana, ou biolixiviação é um processo biotecnológico que se fundamenta na utilização de microorganismos capazes de solubilizar metais pela oxidação de sulfetos metálicos, sendo nos dias atuais, uma das mais importantes alternativas para a extração de metais, sobretudo do ponto de vista ambiental e econômico. Uma das principais espécies utilizada neste processo é o Acidithiobacillus ferrooxidans, uma bactéria aeróbia, mesofílica e acidofílica, que obtém energia pela oxidação de substratos inorgânicos, basicamente o íon ferroso e compostos reduzidos de enxofre. Todavia,

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Melo, Wanessa de Cássia Martins Antunes de. "Biossolubilização da calcopirita na presença dos íons cloreto e ácidos orgânicos /." Araraquara : [s.n.], 2010. http://hdl.handle.net/11449/87993.

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Resumo: O uso de bactéria como agente catalítico para a lixiviação de sulfetos minerais é largamente reconhecido hoje como uma metodologia interessante, sob o ponto de vista econômico e ambiental, para a recuperação de metais de minérios de baixo teor e minérios de sulfetos secundários. A principal bactéria envolvida neste processo é a Acidithiobacillus ferrooxidans, um microrganismo quimiolitotrófico e acidofílico que obtem energia através da oxidação do íon Fe2+, além das formas reduzidas de enxofre e sulfetos metálicos. Dentre os principais sulfetos metálicos encontrados nas reservas minera

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