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Dissertations / Theses on the topic 'Bacterial leaching'

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Published: 4 June 2021

Last updated: 25 July 2024

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1

Ndlovu, Sehliselo. "Bacterial leaching of pyrite single crystals." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401694.

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2

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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3

Seifelnassr, A. A. S. "Bacterial aided percolation leaching of copper sulphide ores." Thesis, Bucks New University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234445.

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4

Garcia, Íris Gabriela [UNESP]. "Consórcios microbianos associados a ambientes de minas: obtenção, avaliação fisiológica e molecular." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/88026.

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Garcia, Íris Gabriela. "Consórcios microbianos associados a ambientes de minas : obtenção, avaliação fisiológica e molecular /." Araraquara, 2013. http://hdl.handle.net/11449/88026.

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Orientador: Denise Bevilaqua<br>Banca: Ana Teresa Lombardi<br>Banca: Monica Cristina Teixeira<br>Resumo: Na natureza, os sulfetos minerais constituem a principal fonte para extração industrial de metais, como o cobre, o chumbo, o zinco e o níquel. A calcopirita (CuFeS2) é um sulfeto de cobre importante, sendo o mineral de cobre mais abundante na natureza. Dentre os processos utilizados para a extração de metais está a biolixiviação, que consiste no processamento de minérios utilizando-se micro-organismos, e é reconhecida hoje como uma metodologia interessante sob os pontos de vista econômico e

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6

Coram, Nicolette Joanne. "Molecular characterization of iron-oxidizing Leptospirillum strains from around the world." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52944.

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Dissertation (PhD) -- University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: More than sixteen isolates of iron-oxidizing bacteria belonging to the genus Leptospirillum were included in this study, with the finding that they were clearly divisible into two major groups. Group I leptospirilla had mol% G+C ratios within the range 49-52%, three copies of rrn genes and based on 16S rRNA sequence data, clustered together with the Leptospirillum ferrooxidans type strain (DSM2705or LI5). Group II leptospirilla had mol% G+C ratios of 55-58%, two copies of rrn genes and based on 16S rRNA sequenc

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7

Tasa, Andrus. "Biological leaching of shales : black shale and oil shale /." Tartu : Tartu University Press, 1998. http://bibpurl.oclc.org/web/24619.

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8

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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9

Chapman, J. T. "The batch and continuous bacterial leaching kinetics of a refractory gold-bearing pyrite concentrate." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/17706.

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Bibliography: pages 125-136.<br>The recent focus on bacterial leaching as a preoxidation step in the treatment of refractory gold bearing sulphide ores and concentrates, has created the need for kinetic models to adequately describe bacterial leaching reactor performance. This work is a kinetic study of the bacterial leaching of a refractory gold bearing, pyrite concentrate. The study includes the presentation of two mechanistically based, the shrinking particle and propagating pore (Hansford and Drossou, 1986), batch reactor kinetic models. These models are derived for single stage continuous

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10

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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11

Sampson, Mark Ian. "Influence of the cell properties of acidophilic bacteria during attachment to mineral sulfides and consumption during the oxidation of ferrous iron." Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297789.

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12

Ewart, D. Keith. "Studies on a moderately thermophilic mixed culture of bacteria and its application to the biooxidation of gold-bearing minerals." Thesis, King's College London (University of London), 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389882.

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13

Norman, Philippa Fernandes. "An Investigation into the bacterial leaching of a gold-bearing pyrite/arsenopyrite ore." Master's thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/21903.

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Bibliography : pages 157-173.<br>The main aim of this study was to develop an economically viable bacterial leaching process for a gold-containing pyrite/arsenopyrite ore. The effect of various parameters on, and the mechanism of, bacterial leaching were investigated. Initially milled run-of-mine ore was examined. Batch tests and a continuous bacterial leach were carried out. Bacterial leaching was successful and 91-93% gold dissolution was attained in four days. The process was not economically feasible when compared to the standard flotation-roasting process.

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14

Santos, Ana Laura Araújo [UNESP]. "Efeito do potencial de óxido-redução na biolixiviação da calcopirita." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/110371.

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Made available in DSpace on 2014-11-10T11:09:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-02-19Bitstream added on 2014-11-10T11:58:48Z : No. of bitstreams: 1 000773278_20180219.pdf: 476686 bytes, checksum: 6e5775b02410b85dbee6fa185b69ccfc (MD5) Bitstreams deleted on 2018-02-23T13:06:32Z: 000773278_20180219.pdf,. Added 1 bitstream(s) on 2018-02-23T13:07:23Z : No. of bitstreams: 1 000773278.pdf: 3882989 bytes, checksum: 75667e8c9a8c2a3a7f503d07d51be90f (MD5)<br>As fontes naturais de minérios sulfetados vêm se esgotando rapidamente devido à demanda por metais nas indústrias de ben

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15

Santos, Ana Laura Araújo. "Efeito do potencial de óxido-redução na biolixiviação da calcopirita /." Araraquara, 2014. http://hdl.handle.net/11449/110371.

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Orientador: Denise Bevilaqua<br>Banca: Assis Vicente Benedetti<br>Banca: Paulo Teixeira Lacava<br>Resumo: As fontes naturais de minérios sulfetados vêm se esgotando rapidamente devido à demanda por metais nas indústrias de bens de produção e de consumo. O cobre é um dos metais de maior interesse econômico. Cerca de 70% deste metal é encontrado na natureza na forma de calcopirita (CuFeS2), contudo é o mineral que possui maiores limitações em sua extração. Dentre os processos de extração têm-se a biolixiviação, que utiliza micro-organismos capazes de promoverem a solubilização de metais pela oxi

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16

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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17

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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18

Chukwuchendo, Emmanuel Chukwunonso. "Bio-oxidation of ferrous iron at low temperature conditions in a packed bed column bioreactors." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2545.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2016.<br>The oxidation of microbial ferrous iron is an important sub-process in the bioleaching process. Several studies focussing on microbial ferrous iron oxidation have been investigated and reported in various studies. These studies were carried out using stirred tank bioreactors and shake flasks at optimum conditions. However, these studies could not describe the context of heap bioleach system. Packed column system may describe heap bioleaching, and most studies on microbial ferrous iron oxidation were perfor

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19

Jiang, Shuang. "Bacterial leaching from dairy shed effluent applied to a fine sandy loam under flood and spray irrigations." Lincoln University, 2008. http://hdl.handle.net/10182/668.

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Land application of wastes has become increasingly popular, to promote nutrient recycling and environmental protection, with soil functioning as a partial barrier between wastes and groundwater. Dairy shed effluent (DSE), may contain a wide variety of pathogenic micro-organisms, including bacteria (e.g. Salmonella paratyphyi, Escherichia coli. and Campylobacter), protozoa and viruses. Groundwater pathogen contamination resulting from land-applied DSE is drawing more attention with the intensified development of the dairy farm industry in New Zealand. The purpose of this research was to investi

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20

Harahuc, Lesia. "Control of iron and sulfur oxidation activities of Thiobacillus ferrooxidans and bacterial leaching of metals from sulfide ores." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0027/NQ51648.pdf.

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21

Mabusela, Bongolwethu Professor. "The effect of initial pH on surface properties of ferric ion precipitates formed during microbial oxidation of ferrous ion by Leptospirillum ferriphilum in a CSTR." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2553.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2017.<br>While bioleaching is a proven technology for the efficient recovery of base metals from sulphide minerals, its sustenance is dependent on the continuous availability of ferric ion, Fe3+, in soluble form, in the bioleach liquor. However, the solubility of ferric ion is low at higher pH that it tends to precipitate, resulting in the formation of ferric ion precipitates. The formation of ferric ion precipitates in bio-hydrometallurgy decreases the leaching efficiency by trapping the leached metals in solution

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22

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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23

Shashikala, A. R. "Role Of Interfacial Phenomena In Bioprocessing Of Minerals Using Bacillus Polymyxa." Thesis, Indian Institute of Science, 2001. https://etd.iisc.ac.in/handle/2005/246.

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In recent years there has been growing interest in bio-mineral processing due to its low operating costs and its application in processing lean-grade ores. Bioprocessing is a good alternative to conventional hydrometallurgy process in mineral processing. In recent times microorganisms have been used as surface modifiers in processes such as froth flotation and flocculation. The surface properties of microbes and minerals such as zeta potential and surface hydrophobicity play a major role in determining adhesion of microorganisms to minerals and hence, the efficiency of flocculation and flotati

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24

Shashikala, A. R. "Role Of Interfacial Phenomena In Bioprocessing Of Minerals Using Bacillus Polymyxa." Thesis, Indian Institute of Science, 2001. http://hdl.handle.net/2005/246.

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In recent years there has been growing interest in bio-mineral processing due to its low operating costs and its application in processing lean-grade ores. Bioprocessing is a good alternative to conventional hydrometallurgy process in mineral processing. In recent times microorganisms have been used as surface modifiers in processes such as froth flotation and flocculation. The surface properties of microbes and minerals such as zeta potential and surface hydrophobicity play a major role in determining adhesion of microorganisms to minerals and hence, the efficiency of flocculation and flotati

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25

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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26

Chandraprabha, M. N. "Studies On Bio-Oxidation A Refractory Gold Containing Sulphidic Concentrate With Respect To Optimization And Modeling." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/188.

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Although bacterial leaching of sulphidic minerals is a well-known phenomenon, it is only in the last ten years that full-scale bacterial leaching plants have been commissioned for gold processing. In order for bacterial leaching to compete successfully with other pretreatment processes for refractory ores, particularly with established technologies such as roasting and pressure leaching, it needs to be efficient. This requires the optimization of the parameters affecting the leaching reaction and the growth of bacteria. The entire biotreatment process is agitation leaching, carried out in

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Chandraprabha, M. N. "Studies On Bio-Oxidation A Refractory Gold Containing Sulphidic Concentrate With Respect To Optimization And Modeling." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/188.

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Although bacterial leaching of sulphidic minerals is a well-known phenomenon, it is only in the last ten years that full-scale bacterial leaching plants have been commissioned for gold processing. In order for bacterial leaching to compete successfully with other pretreatment processes for refractory ores, particularly with established technologies such as roasting and pressure leaching, it needs to be efficient. This requires the optimization of the parameters affecting the leaching reaction and the growth of bacteria. The entire biotreatment process is agitation leaching, carried out in st

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28

Kotze, Andries Albertus. "Analysis of arsenic resistance in the biomining bacterium, Acidithiobacillus caldus." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/17374.

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Thesis (MSc)--University of Stellenbosch, 2006.<br>ENGLISH ABSTRACT: In this study the chromosomal arsenic resistance (ars) genes shown to be present in all Acidithiobacillus. caldus isolates were cloned and sequenced from At. caldus #6. Ten open reading frames (ORFs) were identified on a clone conferring arsenic resistance, with three homologs to arsenic genes, arsC (arsenate reductase), arsR (regulator) and arsB (arsenite export). This ars operon is divergent, with the arsRC and arsB genes transcribed in opposite directions. Analysis of the putative amino acid sequences of these arsRC and ar

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29

Goldschmidt, Gunther Karl. "Cloning, Sequencing and Partial Characterization of the Accessory Gene Region of Plasmid pTC-F14 isolated from the Biomining Bacterium Acidithiobacillus caldus f." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1588.

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Thesis (MSc (Microbiology))--University of Stellenbosch, 2005.<br>Plasmid pTC-F14 is a 14.2kb promiscuous, broad-host range IncQ-like mobilizable plasmid isolated from Acidithiobacillus caldus f. At. caldus is a member of a consortium of bacteria (along with Acidithiobacillus ferrooxidans and Leptospirilum ferrooxidans) that is used industrially for decomposing metal sulphide ores and concentrates at temperatures of 40ºC or below which is now a well-established industrial process to recover metals from certain copper, uranium and gold-bearing minerals or mineral concentrates. These biomining m

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30

Türe, Didem Beyhan Mehmet. "Kirlenmiş sedimentlerin biyoliç yöntemi ile iyileştirilmesi /." Isparta : SDÜ Fen Bilimleri Enstitüsü, 2008. http://tez.sdu.edu.tr/Tezler/TF01219.pdf.

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31

Nicolau, Paula Bacelar V. C. "Novel iron-oxidising acidophilic heterotrophic bacteria from mineral leaching environments." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321390.

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32

Blandón, Nury Alexandra Muñoz [UNESP]. "Recuperação de níquel e outros metais a partir de diferentes fontes (rejeitos minerais de processo industrial e pentlandita '(Ni,Fe)IND. 9' 'S IND. 8' ) mediante lixiviação ácida e bacteriana." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/100745.

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Made available in DSpace on 2014-06-11T19:31:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-07-15Bitstream added on 2014-06-13T20:41:04Z : No. of bitstreams: 1 blandon_nam_dr_araiq.pdf: 1604539 bytes, checksum: 04a560f1fafec8780368e656b90e1e36 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Uma possibilidade para a recuperação de metais a partir de minerais com baixos teores ou de rejeitos industriais é a utilização da lixiviação com micro-organismos. A biolixiviação é o processo de oxidação bacteriana de sulfetos metálicos contendo metais de valor

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33

Yahya, Abidah. "Physiological and phylogenetic studies of some novel acidophilic mineral-oxidising bacteria." Thesis, Bangor University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322564.

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34

Blandón, Nury Alexandra Muñoz. "Recuperação de níquel e outros metais a partir de diferentes fontes (rejeitos minerais de processo industrial e pentlandita '(Ni,Fe)IND. 9' 'S IND. 8' ) mediante lixiviação ácida e bacteriana /." Araraquara : [s.n.], 2010. http://hdl.handle.net/11449/100745.

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Resumo: Uma possibilidade para a recuperação de metais a partir de minerais com baixos teores ou de rejeitos industriais é a utilização da lixiviação com micro-organismos. A biolixiviação é o processo de oxidação bacteriana de sulfetos metálicos contendo metais de valor (por exemplo, níquel, cobre ou zinco), os quais são liberados para a solução, seguida da recuperação por técnicas metalúrgicas convencionais. Estudos de biolixiviação de concentrados de sulfetos minerais em tanques agitados e, sobretudo em pilhas, têm sido desenvolvidos em escala piloto e comercial. Entretanto, poucos trabalhos

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35

Janosch, Claudia [Verfasser], Wolfgang [Akademischer Betreuer] Sand, and Bettina [Akademischer Betreuer] Siebers. "Sulfur oxidation in moderately thermophilic leaching bacteria / Claudia Janosch. Gutachter: Bettina Siebers. Betreuer: Wolfgang Sand." Duisburg, 2013. http://d-nb.info/1042934614/34.

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36

Khalfet, Ridha. "Étude d'une colonne à bulles à solide suspendu destinée à la biolixiviation de matières premières minérales : application à la biolixiviation de minerai de pyrite." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL127N.

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On étudie la faisabilité du procédé de biolixiviation de minerais sulfurés métalliques dans une colonne à bulles à solide suspendu, à priori moins énergivore que le réacteur mécaniquement agité utilisé habituellement dans l'industrie minéralurgique. Afin de donner les bases du dimensionnement du réacteur, des études hydrodynamique, de transfert de matière gaz-liquide et de transfert de chaleur à un tube de transfert ont été réalisées sur une colonne pour deux types de particules (billes de verre et particules de pyrite). La rétention de gaz est plus petite en milieu triphasique qu'en système b

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Andersson, Stefan. "Influence of liming substances and temperature on microbial activity and leaching of soil organic matter in coniferous forest ecosystems /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5850-1.pdf.

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38

Haddadin, Jamal. "Études microbiologiques et cinétiques de la lixiviation bactérienne en réacteurs : effet de différents paramètres physico-chimiques, développement d'un procédé en réacteurs air-lift et lit-fluidisé et application à l'extraction de l'antimoine." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL063N.

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La lixiviation bactérienne est l'application biotechnologique la plus importante dans l'industrie métallurgique, celle-ci est utilisée pour la récupération des métaux par lessivage, utilisant les capacités que possèdent certains micro-organismes à solubiliser les métaux. Ce travail est divisé en quatre sections: premièrement, nous avons identifié la composition microbiologique de la culture mixte en notre possession. Cette culture mixte est composée de trois populations bactériennes. Deuxièmement, nous avons étudié l'influence de certains paramètres physico-chimiques tels que le pH, la tempéra

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Florian, Bianca [Verfasser], Wolfgang [Akademischer Betreuer] Sand, and Hans-Curt [Akademischer Betreuer] Flemming. "Investigation of initial attachment and biofilm formation of mesophilic leaching bacteria in pure and mixed cultures and their efficiency of pyrite dissolution / Bianca Michaela Florian. Gutachter: Hans-Curt Flemming. Betreuer: Wolfgang Sand." Duisburg, 2012. http://d-nb.info/1023643790/34.

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40

Farias, Christyan Paiva. "Fungos promotores do crescimento vegetal e da fitorremediação de metais pesados em combinação com biochar." Universidade Federal de Uberlândia, 2018. http://dx.doi.org/10.14393/ufu.di.2018.713.

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A busca por medidas sustentáveis para melhorar e suprir a demanda por alimentos que o crescimento populacional exige, aliado a escassez de terras produtivas, além do acúmulo excessivo de metais no ambiente devido a atividades como mineração e aplicação de fertilizantes no solo, foram as duas problemáticas que motivaram o presente estudo. O uso de fungos promotores do crescimento vegetal: Beauveria bassiana, Metarhizium anisopliae, Pochonia chlamydosporia, Purpureocillium lilacinum e Trichoderma asperella, pode tanto vir a influenciar o aumento da produtividade como potencializar a fitorremedia

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Marais, Caroline. "Formation de concrétions calcomagnésiennes par polarisation cathodique associée à la biocalcification et à l’utilisation de matériaux recyclés pour la protection côtière." Electronic Thesis or Diss., La Rochelle, 2023. http://www.theses.fr/2023LAROS020.

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L’objectif de cette étude vise à développer une solution à faible impact environnemental pour la consolidation des zones côtières partiellement immergées. Cette solution, la formation d’un agglomérat calcomagnésien par électrolyse de l’eau de mer, s’appuie d’une part sur l’économie des ressources locales par valorisation des déchets inertes du BTP (granulats recyclés (GR)) ; et d’autre part sur le processus de biominéralisation impliquant l’hydratation du CO2 par l’enzyme anhydrase carbonique (AC) présente chez les bactéries marines prélevées dans le Port de La Rochelle. Trois axes majeurs ont

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Simate, Geoffrey Simate. "Bacterial leaching of nickel literites using chemolithotrophic microorganisms." Thesis, 2009. http://hdl.handle.net/10539/7098.

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Biohydrometallurgy, an interdisciplinary field involving geomicrobiology, microbial ecology, microbial biochemistry, and hydrometallurgy, is a promising novel technology for recovering valuable minerals from traditionally difficult-to-process ores. In this study, the possibility to treat nickel laterites biohydrometallurgically using chemolithotrophic microorganisms was investigated. Nickel laterite contains metal values but is not capable of participating in the primary chemolithotrophic bacterial oxidation because it contains neither ferrous iron nor substantial amount of reduced sulp

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Bolorunduro, Samuel Adewale. "Kinetics of leaching of chalcocite in acid ferric sulfate media : chemical and bacterial leaching." Thesis, 1999. http://hdl.handle.net/2429/9400.

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The lack of a clear understanding of the rate of chalcocite (Cu₂S) and covellite (CuS) leaching in the presence and absence of bacteria has been a limitation on the optimization of hydrometallurgical processes for the recovery of copper from these minerals. In order to enhance the performance of heaps and other leaching processes for these minerals, there is a need to examine the conditions required to improve the rate of leaching. Such an investigation will produce a particle scale model (for the intrinsic rate of leaching), which can be combined with a heap scale model to form a compre

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Tlotleng, Nonhlanhla. "Evaluation of atomic force microscopy techniques for imaging and studying surface characteristics of bacterial systems involved in bioleaching." Thesis, 2009. http://hdl.handle.net/10210/2457.

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M.Tech<br>Atomic force microscopy (AFM) has been an integral tool in bacterial studies for resolving surface structures. Novel applications of this instrument in research require the development of sample preparation techniques and improvement of existing ones. Careful selection of the scanning parameters is particularly crucial when exploring the full potential of the AFM. The objective of this study was to design sample preparation methods for AFM imaging bioleaching bacteria and optimise the scanning parameters (deflection setpoint, feedback loop and the scan rate) for contact mode (CM) ima

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Lizama, Hector M. "Bacterial leaching study of a complex Cu-Zn sulfide ore." 1989. http://hdl.handle.net/1993/16910.

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"The low potential bioleaching of chalcopyrite with ferroplasma JTC3." Thesis, 2009. http://hdl.handle.net/10210/2441.

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M.Sc.<br>The leaching of chalcopyrite (CuFeS2) concentrate in a ferrous iron promoted aerobic/anaerobic controlled low potential sulphate system was investigated by using the duel metabolic (aerobic ferrous iron oxidation and anaerobic ferric iron reduction) capabilities of Ferroplasma JTC 3. The experimental work conducted in this study was divided in three sections. The first section focussed on the identification and phylogenetic classification of Ferroplasma JTC 3, first identified amongst a mixed microbial population in a 55 oC pyrite concentrate-fed bioreactor operated at Johannesburg Te

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Fosso-Kankeu, Elvis. "Ni²⁺ extraction from low grade leachate of tailing dumps materials using cloned indigenous bacterial species." Thesis, 2012. http://hdl.handle.net/10210/8033.

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Ramcharan, Karishma. "Microbial biotransformation of kimberlite ores." Thesis, 2008. http://hdl.handle.net/10413/541.

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Microbial leaching plays a significant role in the natural weathering of silicate containing ores such as diamond-bearing kimberlite. Harnessing microbial leaching processes to pre-treat mined kimberlite ores has been proposed as a means of improving diamond recovery efficiencies. The biomineralization of kimberlite is rarely studied. Therefore, this study investigated the feasibility of exploiting both chemolithotrophic and heterotrophic leaching processes to accelerate the weathering of kimberlite. Preliminary investigations using mixed chemolithotrophic leaching cultures were performed on f

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Selvi, S. Chirpa. "Electrobioleaching Of Sphalerite Flotation Concentrate." Thesis, 1997. https://etd.iisc.ac.in/handle/2005/1799.

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Selvi, S. Chirpa. "Electrobioleaching Of Sphalerite Flotation Concentrate." Thesis, 1997. http://etd.iisc.ernet.in/handle/2005/1799.

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