Relevant bibliographies by topics / Bacterial leaching

Academic literature on the topic 'Bacterial leaching'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Bacterial leaching.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Bacterial leaching"

1

Devasia, Preston, and K. A. Natarajan. "Bacterial leaching." Resonance 9, no. 8 (August 2004): 27–34. http://dx.doi.org/10.1007/bf02837575.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Henry, J. G., D. Prasad, and W. B. Lohaza. "Fate of indicator organisms in sludge during bacterial leaching of metals." Canadian Journal of Civil Engineering 18, no. 2 (April 1, 1991): 237–43. http://dx.doi.org/10.1139/l91-028.

Full text
Abstract:
Biological extraction (bacterial leaching) of heavy metals from digested sewage sludge has been shown to be a practical means for decontaminating sludge for use on agricultural land. However, it was not known whether pathogenic organisms would survive or be destroyed in the acidic environment necessary for the bacterial leaching process. The purpose of the research reported herein was to assess the effect of bacterial leaching on various bacteria commonly used to indicate the possible presence of pathogenic organisms. Although pathogenic viruses, bacteria, protozoa, and helminths may be present in sludge, this study is concerned only with bacterial pathogens. The concentrations of the four indicator bacteria selected to represent the bacterial pathogens were determined in a series of laboratory bacterial leaching units. Results showed that, although about 80–90% metal removal efficiencies were achieved (at a pH of 4.0, an aeration rate of 100 mL of air per minute per litre of sludge) at a temperature of 20–25 °C, the indicator bacteria were not reduced during bacterial leaching at high suspended solids concentrations. The survival of indicator bacteria was found to be a function of the suspended solids concentration in the leaching units, regardless of the source or type of indicator bacteria. At suspended solids concentrations greater than 10 g/L, the indicator bacteria were able to survive, apparently unaffected by the unfavourable environmental conditions (10 days retention at pH 4.0). Below this suspended solids concentration of 10 g/L, significant reductions of total coliforms, faecal coliforms, and faecal streptococci were achieved. Total heterotrophs did not follow the same trends as the other indicator bacteria. Key words: bacterial leaching, Thiobacillus ferrooxidans, indicator bacteria, enteric pathogens removal, sewage sludge, sludge disposal.
APA, Harvard, Vancouver, ISO, and other styles
3

Gibbs, H. E., M. Errington, and F. D. Pooley. "Economics of Bacterial Leaching." Canadian Metallurgical Quarterly 24, no. 2 (April 1985): 121–25. http://dx.doi.org/10.1179/cmq.1985.24.2.121.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Haddadin, Jamal, Christophe Dagot, and Michel Fick. "Models of bacterial leaching." Enzyme and Microbial Technology 17, no. 4 (April 1995): 290–305. http://dx.doi.org/10.1016/0141-0229(94)00032-8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Susilawati, Rita. "BIOLEACHING FOR THE RECOVERY OF METALS PEMISAHAN UNSUR LOGAM DENGAN BIOLEACHING." Buletin Sumber Daya Geologi 10, no. 3 (November 8, 2015): 78–88. http://dx.doi.org/10.47599/bsdg.v10i3.149.

Full text
Abstract:
A simple laboratory experiment has been conducted in order to demonstrate the ability of bacteria to leach the metal elements from insoluble ores or solid substrates. The experiment was conducted in a leaching column that was set up using 5 cc syringe that contained 1 cc of glass wool and 3.5cc of mine tailings. The basal salt was used as an inoculation media while mine tailing was used as a leaching subject and a source of bacterial leaching. Bacterial leaching was isolated using the most probable number (MPN) technique. Overall, the results of the experiment showed the capability of bioleaching process to recover metals from the mine tailings.
APA, Harvard, Vancouver, ISO, and other styles
6

Rohwerder, Thore, and Wolfgang Sand. "Combined Test for Bioleaching Activities." Advanced Materials Research 20-21 (July 2007): 171. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.171.

Full text
Abstract:
Both, the employment of leaching bacteria for metal winning as well as the mitigation of bioleaching processes at AMD/ARD sites, require reliable monitoring methods for assessing bacterial activities. Therefore, we have developed a robust and rapid test system combining two sensitive analytical techniques: quantification of heat evolution by microcalorimetry and determination of all relevant inorganic sulfur species by chromatographic methods (IC and HPLC). Generally, only about 1 g of sample is sufficient for a complete analysis. The combined test has been applied to various leaching biotopes such as bioreactors, columns, heaps and natural sites. The bacterial activity of diverse sulfidic materials such as lignite and coal wastes, pure metal sulfides and complex ores has been investigated. In our labs, microcalorimetry can be performed in the range of 5 to 80 °C, covering most of the temperature spectrum of leaching bacteria. Hence, the heat evolution values of samples as a direct measure for calculating leaching rates can be obtained at nearly all relevant in situ temperatures. The combination with sulfur species determination results in additional information on leaching mechanisms (thiosulfate or polysulfide pathway) and general leaching performance (e. g. accumulation of sulfur intermediates).
APA, Harvard, Vancouver, ISO, and other styles
7

Wang, Xin, Hong Ying Yang, Lin Lin Tong, Zhe Nan Jin, and Su Xing Zhao. "Research on Bio-Leaching of Nickel-Bearing Tailings in Jilin, China." Solid State Phenomena 262 (August 2017): 177–80. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.177.

Full text
Abstract:
Gradually bio-metallurgy technology is becoming an irreplaceable new technology. The nickel-bearing tailings in Jilin, China contains Ni 0.13 %, Cu 0.03%, Co 0.01%, S 15.20%, Fe 6.30%. A comparative study of the HQ0211 bacteria, indigenous bacteria (after the domestication named ZXJE511 bacteria) and acid pool leaching revealed that the local species ore leaching was preferably the best way. At pH 2.0, room temperature (about 23°C), pulp density 20%,the Ni, Co and Cu leaching rates were 70.08%, 40% and 57.67 % , respectively ,after 38 days of bioleaching, proving the superiority of the bacterial leaching of Ni, Co, Cu from tailings. Biological leaching tailings solved the problem of the conventional methods which could not be addressed by acid leaching. This technology is environmentally friendly and can make maximum use of the resources, thereby avoiding the waste of the resources.
APA, Harvard, Vancouver, ISO, and other styles
8

Fečko, Peter, Vojtěch Zechner, Michal Guziurek, Barbora Lyčková, and Eva Pertile. "The Possibilities of Application of Bacterial Leaching in Retrieval of Valuable Metals From Mining Waste." Nova Biotechnologica et Chimica 11, no. 2 (December 1, 2012): 147–52. http://dx.doi.org/10.2478/v10296-012-0017-9.

Full text
Abstract:
Abstract The paper deals with an application of bacterial leaching on two selected samples from old ecological loads situated in the Karlovy Vary Region. To be specific, they are heaps in Prebuz and Kraslice. Bacterial leaching was applied making use of Acidithiobacillus ferrooxidans bacteria and lasted 28 days. The results imply that the given method is suitable for the retrieval of valuable metals from waste and may help to deal with the issue of old heaps and dumps.
APA, Harvard, Vancouver, ISO, and other styles
9

NAKAZAWA, Hiroshi, Naofumi KUDO, Hayato SATO, and Ming CHEN. "Bacterial leaching of manganese nodules." Shigen-to-Sozai 105, no. 6 (1989): 470–74. http://dx.doi.org/10.2473/shigentosozai.105.470.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Brierley, C. L. "Bacterial succession in bioheap leaching." Hydrometallurgy 59, no. 2-3 (February 2001): 249–55. http://dx.doi.org/10.1016/s0304-386x(00)00171-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Bacterial leaching"

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
Made available in DSpace on 2014-06-11T19:23:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-07-05Bitstream added on 2014-06-13T18:09:18Z : No. of bitstreams: 1 garcia_ig_me_araiq_parcial.pdf: 206327 bytes, checksum: 96ce2244d53cd6b26eef086e6ea1ab1a (MD5) Bitstreams deleted on 2015-06-03T11:42:41Z: garcia_ig_me_araiq_parcial.pdf,. Added 1 bitstream(s) on 2015-06-03T11:44:08Z : No. of bitstreams: 1 000721776_20150831.pdf: 196800 bytes, checksum: 7855db2c08df6a688c6d404aeebac5cd (MD5) Bitstreams deleted on 2015-08-31T12:12:22Z: 000721776_20150831.pdf,. Added 1 bitstream(s) on 2015-08-31T12:12:57Z : No. of bitstreams: 1 000721776.pdf: 1205657 bytes, checksum: 64d61f0337043ba4804b2dcd6c5ffe5b (MD5)
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 ambiental. Neste contexto, este trabalho foi desenvolvido com o objetivo de se obter consórcios oxidantes de ferro e de enxofre capazes de promover a solubilização da calcopirita. Para obtenção dos consórcios, quinze amostras minerais fornecidas pela Companhia Vale S.A. foram enriquecidas em meios de cultivo específicos. Foram obtidos 4 consórcios oxidantes de ferro e 4 oxidantes de enxofre, denominados Dep SOS-4, S3A, SO3, D1. A análise dessas amostras minerais por difração de raios X evidenciou a presença predominante de quartzo (SiO2) nas amostras Dep SOS-4 e S3A e nas amostras D1 e SO3 também foi observado covelita (CuS), pirrotita (FeS), calcopirita (CuFeS2) e enxofre (S0). Os consórcios oxidantes de ferro foram adaptados ao crescimento em calcopirita e submetidos a ensaios de biolixiviação em calcopirita. Agrupamentos dos consórcios também foram realizados, porém sem adaptação prévia à calcopirita. Nos ensaios de biolixiviação, os valores de Eh se elevaram continuamente nos frascos inoculados, estabilizando ao redor de 550 mV, indicando o aumento da relação Fe3+/Fe2+, o que afeta diretamente a solubilização dos metais pela ação oxidante do Fe3+. Mesmo considerando que a calcopirita é um dos sulfetos mais refratários ao ataque oxidante, bacteriano ou químico, a extração de cobre nos ensaios...
In nature, sulphide minerals are the main sources for extraction of some metals for industrial uses, such as copper, lead, zinc and nickel. One of the most important and explored copper sulphide is chalcopyrite, being the most abundant copper mineral in nature. Metals can be extracted using microorganisms, leading the bioleaching to an economic and environmentally sustainable process. In this research, it was developed different iron and sulfur oxidizer consortium to promote chalcopyrite (CuFeS2) solubilization. All consortium were obtained from previous enrichment in a specific culture of 15 ore samples provided by Companhia Vale S.A. Four iron oxidizer and four sulfur oxidizer consortium were prepared, and named Dep SOS-4, S3A, SO3 and D1. X ray diffraction of the Dep SOS-4 and S3A samples showed mainly quartz content (SiO2), whereas the SO3 and D1 samples showed covellite (CuS), pyrrothite (FeS), chalcopyrite (CuFeS2) and sulfur (S0) presence too. The iron oxidizer consortium were adapted to grow with chalcopyrite and then used in shake flasks experiments with chalcopyrite. A mix of consortiums was performed, but without a previous adaptation to the chalcopyrite. The Eh values increased during the bioleaching of the inoculated flasks, stabilizing around 550 mV, which affects metal solubilization due to an increase in the Fe+3/Fe+2 ratio. The iron oxidizer consortium resulted in a better dissolution of the chalcopyrite when compare with the control, sulfur oxidizer consortium and pure strain At. thiooxidans - FG01. However, it was not observed any significant difference between the consortium and At. ferrooxidans - LR in the chalcopyrite dissolution. In the respirometric tests with chalcopyrite as substrate were observed lower consumption of oxygen to the iron oxidizer consortium (Dep SOS -4, S3A, SO3 and D1) in relation to... (Complete abstract click electronic access below)
APA, Harvard, Vancouver, ISO, and other styles
5

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

Full text
Abstract:
Orientador: Denise Bevilaqua
Banca: Ana Teresa Lombardi
Banca: Monica Cristina Teixeira
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 ambiental. Neste contexto, este trabalho foi desenvolvido com o objetivo de se obter consórcios oxidantes de ferro e de enxofre capazes de promover a solubilização da calcopirita. Para obtenção dos consórcios, quinze amostras minerais fornecidas pela Companhia Vale S.A. foram enriquecidas em meios de cultivo específicos. Foram obtidos 4 consórcios oxidantes de ferro e 4 oxidantes de enxofre, denominados Dep SOS-4, S3A, SO3, D1. A análise dessas amostras minerais por difração de raios X evidenciou a presença predominante de quartzo (SiO2) nas amostras Dep SOS-4 e S3A e nas amostras D1 e SO3 também foi observado covelita (CuS), pirrotita (FeS), calcopirita (CuFeS2) e enxofre (S0). Os consórcios oxidantes de ferro foram adaptados ao crescimento em calcopirita e submetidos a ensaios de biolixiviação em calcopirita. Agrupamentos dos consórcios também foram realizados, porém sem adaptação prévia à calcopirita. Nos ensaios de biolixiviação, os valores de Eh se elevaram continuamente nos frascos inoculados, estabilizando ao redor de 550 mV, indicando o aumento da relação Fe3+/Fe2+, o que afeta diretamente a solubilização dos metais pela ação oxidante do Fe3+. Mesmo considerando que a calcopirita é um dos sulfetos mais refratários ao ataque oxidante, bacteriano ou químico, a extração de cobre nos ensaios... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: In nature, sulphide minerals are the main sources for extraction of some metals for industrial uses, such as copper, lead, zinc and nickel. One of the most important and explored copper sulphide is chalcopyrite, being the most abundant copper mineral in nature. Metals can be extracted using microorganisms, leading the bioleaching to an economic and environmentally sustainable process. In this research, it was developed different iron and sulfur oxidizer consortium to promote chalcopyrite (CuFeS2) solubilization. All consortium were obtained from previous enrichment in a specific culture of 15 ore samples provided by Companhia Vale S.A. Four iron oxidizer and four sulfur oxidizer consortium were prepared, and named Dep SOS-4, S3A, SO3 and D1. X ray diffraction of the Dep SOS-4 and S3A samples showed mainly quartz content (SiO2), whereas the SO3 and D1 samples showed covellite (CuS), pyrrothite (FeS), chalcopyrite (CuFeS2) and sulfur (S0) presence too. The iron oxidizer consortium were adapted to grow with chalcopyrite and then used in shake flasks experiments with chalcopyrite. A mix of consortiums was performed, but without a previous adaptation to the chalcopyrite. The Eh values increased during the bioleaching of the inoculated flasks, stabilizing around 550 mV, which affects metal solubilization due to an increase in the Fe+3/Fe+2 ratio. The iron oxidizer consortium resulted in a better dissolution of the chalcopyrite when compare with the control, sulfur oxidizer consortium and pure strain At. thiooxidans - FG01. However, it was not observed any significant difference between the consortium and At. ferrooxidans - LR in the chalcopyrite dissolution. In the respirometric tests with chalcopyrite as substrate were observed lower consumption of oxygen to the iron oxidizer consortium (Dep SOS -4, S3A, SO3 and D1) in relation to... (Complete abstract click electronic access below)
Mestre
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
Dissertation (PhD) -- University of Stellenbosch, 2002.
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 sequence form a separate cluster. Genome DNA-DNA hybridization experiments indicated that three similarity subgroups were present amongst the leptospirilla tested with two DNA-DNA hybridization similarity subgroups being found within group I. The two groups could also be distinguished based on the sizes of their 16S-23SrRNA gene spacer regions. We propose that the group II leptospirilla should be recognized as a new species with the name Leptospirillum ferriphilum sp. nov. Members of the two species can be rapidly distinguished from each other by amplification of their 16S rRNA genes and carrying out restriction enzyme digests of the products. Several but not all isolates of the group II leptospirilla, but none from group I (L. ferrooxidans) were capable of growth at 45°C. Plasmid DNA was isolated from strain ATCC49879 (L. ferrooxidans). Restriction endonuclease mapping of what appeared to be about 60 kb of plasmid DNA, established that two plasmids of approximately 30.0 kb and 27.0 kb were present. These were named p49879.1 and p49879.2 respectively. Attempts to isolate the plasmids separately were not successful. Partial sequencing of the two plasmids was carried out and sequence analysis of p49879.1 and p49879.2 indicated that the plasmids shared regions of homology. Total plasmid DNA was DIG-labelled and used as a probe in Southern hybridization experiments with genomic DNA from all sixteen original leptospirilla isolates as the target DNA. All leptospirilla belonging to Group I gave a positive signal, little or no homology to Group II leptospirilla was obtained. The region of homology present in all L. ferrooxidans strains was localized to an area on plasmid p49879.2 showing high amino acid identity to a transposase/putative transposase of Methanosarcina acetivorans and plasmid CPl from Deinococcus radiodurans Rl respectively. Whether these regions of homology indicate that complete, functional transposons are present in all L. ferrooxidans isolates still remains to be determined. Preliminary sequence analysis of both plasmids resulted in the identification of regions with amino acid sequence identity to the TnpA and TnpR of the Tn2l-like transposon family, and the mobilization regions of IncQ-like plasmids (particularly that of pTFl from At. ferrooxidans). Another potentially interesting ORF was identified in p49879.2 with high amino acid sequence identity to an ArsR-like protein that belongs to a second atypical family of ArsR transcriptional regulators. Whether this protein is functional in the regulation of arsenic resistance genes has not yet been determined, nor have other arsenic resistance genes been identified. Future work includes further sequence analysis of these plasmids to better understand their contribution to the isolates in which they are found.
AFRIKAANSE OPSOMMING: Meer as sestien isolate van die yster-oksiderende bakterieë, wat aan die genus Leptospirillum behoort, is in die studie ingesluit en die resultate het getoon dat dié groep verder in twee hoof groepe verdeel kan word. Groep I het "n mol% G+C van tussen 49% en 52% gehad, sowel as drie kopieë van die ribosomale gene (rrn). Hiermeesaam het die 16SrRNA volgorde data getoon dat hierdie isolate groepeer saam met Leptospirillum ferrooxidans (DSM2705T en LI5). Groep II leptospirilla het "n mol% G+C van tussen 55% en 58% gehad sowel as twee kopieë van die rrn gene en saam met die 16SrRNA volgorde data het hierdie isolate "n aparte groep gevorm. Genoom DNA-DNA hibridisasie eksperimente het gewys dat daar drie subgroepe onder die Leptospirillum wat getoets was is, met twee naverwante groepe wat onder Groep I val. Daar kan ook tussen die twee hoof groepe onderskei word op grond van die grootte van hul 16S- 23SrRNA intergeniese gebiede. Ons stel dus hier voor dat die Groep II leptospirilla as "n nuwe spesie beskou word naamlik, Leptospirillum ferriphilum sp, nov. Die twee spesies kan maklik onderskei word deur die PKR amplifikasie produk van die 16SrRNA te verteer met restriksie ensieme. Vele, maar nie al van die Groep II isolate kan by 45°C groei nie, terwyl geen van die Groep I leptospirilla (L.ferrooxidans) kan nie. Plasmied DNA was geisoleer uit Leptospirillum ferrooxidans ATCC49879. Aanvanklike analise het gedui op die teenwoordigheid van een 60.0 kb plasmied. Verdere restriksie ensiem kartering het wel getoon dat hierdie, in teen deel, twee plasmiede van ongeveer 30.0 kb en 27.0 kb in grootte is: p49879.1 en p49879.2. Pogings om die twee plasmiede apart te isoleer was onsuksesvol. Totale plasmied DNA is gemerk met die Random primed DNA labelling kit (Roche diagnostics) en gebruik as peiler in Southern klad eksperimente met genoom DNA, van al sestien isolate, as teiken. Alle leptospirilla wat aan Groep I behoort het "n positiewe sein gegee terwyl geen sein teen Groep II DNA opgemerk was nie. Die area wat, tussen die plasmiede en Groep I homologie getoon het, is gelokaliseer tot "n area op plasmied p49879.2 wat hoë amino suur identiteit toon aan "n transposase geen van Methanosarcina acetivorans, en "n voorgestelde transposase geen op plasmied CPI van Deinococcus radiodurans Rl. Dit moet nog vasgestel word of hierdie area van homologie dui op die teenwoordigheid van "n volledige, funksionele transposon in alle L. ferrooxidans isolate. Gedeeltelike DNA volgorde bepalings van beide plasmiede het gelei tot die identifikasie van areas met hoë amino suur volgorde identiteit aan die TnpA en TnpR gene van die Tn21-tipe transposon familie, sowel as aan die mobilisasie gene van IncQsoortige plasmiede (veral die van pTFI uit Acidithiobacillus ferrooxidans). "n Oop lees raam van belang, wat op plasmied p49879.2 geidentifiseer was, het hoë amino suur volgorde identiteit aan "n ArsR-tipe geen getoon wat aan "n tweede atiepiese familie van ArsR transkripsionele reguleerders behoort. Op die stadium is dit nog onbekend of hierdie protein funksioneel is in die regulering van arseen weerstandbiedenheidsgene.
APA, Harvard, Vancouver, ISO, and other styles
7

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

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
Bibliography: pages 125-136.
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 reactor description. In addition, the empirical logistic growth model (Pinches et al., 1987) is presented for both batch and continuous reactor description. The models are correlated with the experimental data. Three narrow size fractions of the pyrite concentrate were subjected to batch and continuous bacterial oxidation, using a Thiobacillus ferrooxidans culture. Time profile data of the pyrite oxidation were obtained for the batch reactor study. Similarly, retention time profile data of pyrite oxidation was obtained for the single stage continuous reactor. The .gold extraction as a function of sulphide oxidation as well as fraction arsenic leached, was established.
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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, a interação dessa espécie com os sulfetos metálicos é um assunto ainda pouco entendido e de muita controvérsia na literatura. Com intuito de melhor entender estas diferenças, o presente trabalho estudou a oxidação da molibdenita (MoS2) e da covelita (CuS) pelo A. ferrooxidans linhagem LR em algumas condições fisiológicas, destacando-se a fonte energética de crescimento (íon ferroso e S0) e a remoção das substâncias exopoliméricas (EPS) para células crescidas em íon ferroso. A cinética de oxidação destes sulfetos também foi avaliada. Tais estudos foram realizados pela técnica de respirometria celular, que permite avaliar rapidamente a oxidação do substrato a partir de medidas de oxigênio consumido pela bactéria. Em todas as condições testadas a covelita apresentou significativa diferença de oxidação pelo A. ferroxidans LR em comparação com a molibdenita. A análise da cinética de oxidação dos sulfetos demonstrou que a molibdenita apresenta uma cinética que segue Michaelis-Menten, o mesmo não acontecendo para a covelita, provavelmente devido a forma com que estes sulfetos reagem ao ataque químico-bacteriano, fato determinado pelas estruturas eletrônicas dos sulfetos minerais.
Bacterial leaching or bioleaching is a biotechnological process that applies microorganisms able to solubilize metals by metallic sulfides oxidation. This process is nowadays one of the most important alternatives for recovering metals, mainly by environmental and economic aspects. One of the most important bacteria employed in this process is Acidithiobacillus ferrooxidans. It is a gram-negative, acidophilic, aerobic and chemoautotrophic bacteria that obtain energy by the oxidation of inorganic substrates like ferrous ion and reduced sulfur compounds, including metal sulfides. Nevertheless, the interaction of this specie with metallic sulfides remains unclear. With the aim to understand these interactions, the present work has studied the covellite (CuS) and molydenite (MoS2) oxidation by A. ferrooxidans strain LR under different physiological conditions such as the source energy for growth (S0 and ferrous ion) and the removal of extracellular polymeric substances (EPS). These studies were performed by respirometric technique tha t allow evaluating very quickly the substrate oxidation by oxygen uptake measures. For all essays realized it was observed that the efficiency of covellite oxidation by A. ferrooxidans LR is much better than molybdenite. On the kinetic oxidation analyses, molybdenite revealed to be according to Michaelis-Menten substrate saturate kinetic. On the other hand, covellite was not in agreement with Michalis-Menten kinetic. This finding is probably associated with the pathway which these minerals sulfide react to chemistry-bacterial attack, what is influenced by electronic structures of mineral sulfides. Regarding essays performed with cells of A. ferrooxidans strain LR grown with different substrates (ferrous ion and sulfur) and to essays which EPS of bacterial cells were removed, the results obtained did not show differences in covellite oxidation.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Bacterial leaching"

1

1925-, Ehrlich Henry Lutz, and Brierley Corale L, eds. Microbial mineral recovery. New York: McGraw-Hill, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

International Symposium on Biohydrometallurgy (1989 Jackson Hole, WY). Biohydrometallurgy 89: Abstracts : Jackson, Wyoming, August 13-18, 1989. [S.l: s.n.], 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

International Symposium on Biohydrometallurgy (7th 1987 University of Warwick). Biohydrometallurgy: Proceedings of the international symposium, Warwick, 1987. Kew Surrey: STL, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

International Symposium on Biohydrometallurgy (1989 Jackson Hole, Wyoming). Biohydrometallurgy: Proceedings of the International Symposium held at Jackson Hole, Wyoming August 13-18, 1989. Ottawa, Ont: Canada Centre for Mineral and Energy Technology = Centre canadien de la technologie des minéraux et de l'énergie, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

International Symposium on Biohydrometallurgy (7th 1987 University of Warwick). Biohydrometallurgy: Proceedings of the international symposium, Warwick, 1987. Surrey: Science and Technology Letters, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

R, Amils, and Ballester Antonio, eds. Biohydrometallurgy and the environment toward the mining of the 21st century: Proceedings of the International Biohydrometallurgy Symposium, IBS'99, held in San Lorenzo de El Escorial, Madrid, Spain, June 20-23, 1999. Amsterdam: Elsevier, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

International Symposium on Biohydrometallurgy (14th 2001 Ouro Preto, Minas Gerais, Brazil). Biohydrometallurgy: "fundamentals, technology and sustainble development" : proceedings of the International Biohydrometallurgy Symposium, IBS-2001, held in Ouro Preto, Minas Gerais, Brazil, September 16-19, 2001. Edited by Ciminelli V. S. T, Garcia O, Teixeira M. C, Carvalho R. P. de, and Pimentel P. F. Amsterdam: Elsevier, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Southwood, A. J. The agglomeration of fine material for bacterial heap leaching. Randburg, South Africa: Council for Mineral Technology, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Kamalov, M. R. Rolʹ mikroorganizmov v vyshchelachivanii metallov iz rud Kazakhstana. Alma-Ata: "Gylym", 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Mineev, G. G. Biometallurgii͡a︡ zolota. Moskva: "Metallurgii͡a︡", 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Bacterial leaching"

1

Frutos, F. J. Garcia. "Bacterial Leaching of Minerals." In Mineral Processing and the Environment, 43–72. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-2284-1_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Crundwell, Frank K. "Physical Chemistry of Bacterial Leaching." In Biomining, 177–200. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-06111-4_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Wiertz, J. V., Inés Godoy Ríos, and Blanca Escobar Miguel. "Dissolved iron equilibrium in bacterial leaching systems." In Hydrometallurgy ’94, 385–93. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1214-7_24.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Marković, Zoran M., and Biljana M. Todorović Marković. "Novel Antimicrobial Strategies to Combat Biomaterial Infections." In Urinary Stents, 305–13. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04484-7_24.

Full text
Abstract:
AbstractBacteria are present in nature everywhere and the combat with them has the major priority especially in various industrial settings (i.e. food industry) or medical devices. It was established earlier that most of bacteria found in nature exist in the form of biofilms (attached to surface of different objects and not as free floating organisms).There are several possible strategies to reduce or prevent bacterial infections among different populations: patients and medical staff. One of the alternative strategies independent of human labor, is to produce antibacterial coatings to reduce or eliminate bacteria colonization on surfaces by leaching of biocides, antibacterial surfaces with deposited metals such as copper, silver or gold, formation of superhydrophobic surfaces and surfaces encapsulated by photoactive nanoparticles.A new light triggered strategies to combat bacterial infections and possible usage of photoactive polymers for these purposes. Photoactive antibacterial polymers are highly promising solution for novel medical devices. To enable their wise usage for the treatment of urinary infections some changes must be made. For example, the effectiveness of photoactive polymers inside human body can be increased by incorporation of micron sized electronic devices (light emitting diode, light detector, pH sensor, radio frequent device) into polymer matrices.
APA, Harvard, Vancouver, ISO, and other styles
5

Simate, G. S., and Sehliselo Ndlovu. "Characterisation of Factors in the Bacterial Leaching of Nickel Laterites Using Statistical Design of Experiments." In Advanced Materials Research, 66–69. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-452-9.66.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Seidel, Heinz, Jelka Ondruschka, and Ulrich Stottmeister. "Heavy Metal Removal from Contaminated Sediments by Bacterial Leaching: A Case Study on the Field Scale." In Contaminated Soil ’95, 1039–48. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0421-0_30.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Yamane, Luciana Harue, Denise Crocce Romano Espinosa, and Jorge Alberto Soares Tenorio. "Effects of Inoculums Volume on Metals Extraction from Printed Circuit Boards of Computers by Bacterial Leaching." In EPD Congress 2012, 255–62. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118359341.ch30.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Tsertsvadze, L. A., T. D. Dzadzamia, SH G. Petriashvili, D. G. Shutkerashvili, E. I. Kirkesali, M. V. Frontasyeva, S. S. Pavlov, and S. F. Gundorina. "Development of the Method of Bacterial Leaching of Metals Out of Low-Grade Ores, Rocks, and Industrial Wastes Using Neutron Activation Analysis." In Radionuclides and Heavy Metals in Environment, 245–57. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0993-5_35.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Johnson, D. Barrie. "The Leaching of Mineral Ores Using Bacteria." In Resources and Applications of Biotechnology, 91–99. London: Palgrave Macmillan UK, 1988. http://dx.doi.org/10.1007/978-1-349-09574-2_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Joe, Seong Jin, Masatoshi Sakoda, Tadashi Chida, Yoshiharu Kida, Hidekatsu Nakamura, and Muneyuki Tamura. "Searching for Useful Bacteria on Chalcopyrite Leaching from Japanese Abandoned Mines." In Advanced Materials Research, 557–60. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-452-9.557.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Bacterial leaching"

1

Florian, B. M., and W. Sand. "Inhibition of bacterial pyrite leaching by surfactants." In MICROBES IN APPLIED RESEARCH - Current Advances and Challenges. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814405041_0028.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Zavada, Jaroslav. "BACTERIAL LEACHING OF URANIUM RAW MATERIALS FROM ROZNA DEPOSIT (CZECH REPUBLIC)." In 14th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b13/s3.011.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Janakova, Iva, Barbora Fejfarova, Oldrich Sigut, and Vladimir Cablik. "Utilisation of Acidithiobacillus Ferrooxidans Bacteria for Bioleaching of Waste Materials from Silver-Bearing Ore Mining." In 4th International Conference on Advances in Environmental Engineering. Switzerland: Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-o8cism.

Full text
Abstract:
The extraction and processing of silver minerals produce significant amounts of waste, which poses environmental challenges due to their low metal content and the potential release of toxic elements. The study investigates the application of Acidithiobacillus ferrooxidans (AF) bacteria to the bioleaching of these waste materials, with the aim of maximizing the recovery of iron, copper and arsenic. The objectives of the study include characterizing waste materials, optimizing the bioleaching process parameters and evaluating metal extraction efficiency. The samples were leached with additives (CuSO4 5H2O and AgNO3) to accelerate the kinetics of metal dissolution in solution and reduce the bacterial leaching time. The results showed that samples 1-2 and 2-2 containing additives had higher values of dissolved iron and copper in the leachate compared to samples 1-1 and 2-1 without additive application.
APA, Harvard, Vancouver, ISO, and other styles
4

TOADER, Elena Violeta, George TOADER, Daniela TRIFAN, Emanuela LUNGU, and Alin-Ionel GHIORGHE. "INNOVATIVE ECOLOGICAL TECHNOLOGIES FOR SOIL RESTORATION: BACTERIAL BIOPREPARATIONS." In Competitiveness of Agro-Food and Environmental Economy. Editura ASE, 2022. http://dx.doi.org/10.24818/cafee/2021/10/09.

Full text
Abstract:
The use of fertilizer products in agricultural crops is a beneficial source of supplementing the nutrients needed for the growth and development of both plants and an increase in agricultural production. However, often the fertilizer doses applied per hectare to agricultural crops are not respected. Failure to comply with the applied fertilizer doses will lead to the occurrence of negative phenomena for soil, environment and agricultural crops, implicitly for human and animal health. Increasing the fertilizer doses per hectare and not respecting them will lead to the occurrence of soil acidification. The decrease of the bacterial colonies in the soil will bring with it a decrease of the humification processes, of the decomposition and solubilization processes of the complex compounds in the soil as well as favoring the leaching and appearance of the complex compounds in the soil (in large quantities). The increase of complex compounds in the soil will lead to a decrease in pH (below pH 7), which will lead to an increase in soil acidity. On acidic soil, crops will not reach their maximum potential in productivity. The use of bacterial biopreparation technologies in agricultural crops plays an important role in plant protection. Some bacterial cultures give plants a protection against pedo-climatic stress, a resistance to the attack of diseases and pests as well as conferring a protection on environmental factors (drought, heavy rainfall, cold, etc.). The use of these bacterial products as fertilizers as well as plant protection products has been shown to have great potential in growing, developing, maximizing agricultural production, in restoring and greening the soil and its beneficial flora, the role of these biological fertilizers being to address a green, sustainable, sustainable agriculture and achieving high, healthy, nutrient-rich productivity, beneficial to human and animal health.
APA, Harvard, Vancouver, ISO, and other styles
5

Janakova, Iva. "APPLICATION OF FLOTATION AND BACTERIAL LEACHING TO ELIMINATE PERSISTENT ORGANIC POLLUTANTS IN THE INFLUENT STREAM OF CERNY PRIKOP." In SGEM2011 11th International Multidisciplinary Scientific GeoConference and EXPO. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2011/s04.102.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Sydykanov, Muratbek, Yerkin Bektay, Gaukhar Turysbekova, Adilkhan Baibatsha, and Gurhan Yalcin. "APPLICATION OF BIOLEACHING OF COPPER FLOTATION TAILINGS." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/4.2/s18.03.

Full text
Abstract:
The lack of new deposits with a rich copper content and the depletion of old deposits, as well as the need to comply with environmental requirements, raises the issue of the need to process the tailings of metallurgical industries. In Kazakhstan was accumulated significant stocks of tailings "Borgezsay" and "Staroye". The tailings reserves are estimated at up to 1 billion tons. Sample evaluation showed that the average copper content in the tailings is 0.15-0.2%. More than 1 million tons of copper are stored in this tailings. The complexity of the structure of minerals passes through the process of leaching of these wastes. Several types of leaching in sulfuric acid were considered for processing. Methods using chalcopyrite as a catalyst or dissolution with chlorides were not economically efficient. Studies have been carried out on the use of copper bioleaching. Bioorganisms destroy various minerals of metals, ensures the transition of metals into the leaching solution. Thionic bacteria Acidithiobacillus ferrooxidans were used. The strains of these iron-oxidizing bacteria occupy an exceptional position among thionic bacteria, since in addition to the ability to autotrophic growth due to the oxidation of sulfur compounds, they can use the energy of oxidation of ferrous iron. Studies have shown that the use of these bacteria can reduce the copper content in samples from 0.2% till 0.05%, in some cases down to 0.005%. Bioleaching carried out on various tailings samples showed the effectiveness of this method.
APA, Harvard, Vancouver, ISO, and other styles
7

El Achkar, Jean H., Abrar Ben Husain, Nadeen Alotaibi, Noor Alhaddad, Taiyeba Alamgir, Husain Alshamali, Yousef Alshammari, et al. "Could Petroleum Sludge be Used to Produce Biomethane as a Renewable Energy Source?" In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/210953-ms.

Full text
Abstract:
Abstract During the exploration, production, and refining of crude oil, as well as the effluent treatment facilities of refineries, the petroleum sector produces a substantial quantity of sludge. This review offers in-depth insights into the methods used to treat and dispose of petroleum sludge today. It also explores the possibility of valorizing such waste while converting it to a sustainable energy source using anaerobic digestion technology. Aside from health concerns, the random disposal of untreated petroleum sludge causes land pollution, water pollution, and ecosystem devastation. Consequently, the adequate treatment and disposal of this sludge provide a substantial challenge to the oil and gas sector, which has become a worldwide concern. Various methods used, such as incineration, oxidation, ultrasounds, stabilization, and landfarming will be presented. On another note, this review imparts a new insight into the possibility of generating biomethane from petroleum sludge. It also investigates its anaerobic co-digestion with food waste and other byproducts, promoting the transition toward a circular bioeconomy. Most conventional sludge treatment methods are unstainable and insufficient to deal with a large amount of generated sludge. Ultrasonic treatment, solvent extraction, and incineration are all expensive processes. Moreover, incineration contributes to air pollution, whereas landfarming and degradation are inefficient and contribute to heavy metals leaching. Considering those disadvantages, creating a greener and more cost-effective approach to securely disposing of these hazardous materials is vital. The bacterial degradation of any substrate without oxygen is known as anaerobic digestion (AD). It is one of the highly efficient systems for recovering bioenergy from small to large sizes. Sludge treatment in anaerobic digesters yields biomethane, a substitute for natural gas, recovered while microorganisms reduce the organic matter in the sludges. However, the sludges have poor anaerobic degradability, and the presence of heavy metals might interfere with anaerobic microorganisms' ability to function. Suitable pretreatment of sludge and its co-digestion with organic wastes such as food waste can be an option to solve the above problems, tackling at the same time the food waste management issues alongside petroleum sludge management.
APA, Harvard, Vancouver, ISO, and other styles
8

Turysbekova, Gaukhar, Yerkin Bektay, Akmurat Altynbek, Muratbek Sidikanov, and Bauyrzhan Shiderin. "INFLUENCE OF IRON-OXIDIZING BACTERIA ON THE REDOX POTENTIAL OF THE LEACHING SOLUTION IN SITU RECOVERY (ISR) OF URANIUM." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/6.2/s25.27v.

Full text
Abstract:
At one of the Kazakh uranium deposits, studies were carried out on the effect of ironoxidizing bacteria on the redox potential of leaching solutions. The studies carried out on three bioreactors with a volume of 1 m3 and one bioreactor with volume 6 m3 made it possible to establish a close relationship between the content of ferric iron in the solution and the redox potential of the leaching solution. In situ recovery of uranium uses sulfuric acid leaching solutions containing sulfuric acid from 3.5 g/liter to 25 grams/liter. Diagrams of the relationship between redox and the content of a trivalent iron in solution were obtained. This makes it possible to carry out an operational analysis of the composition of the leaching solution according to the redox of the solution directly in the conditions of the geotechnological field.
APA, Harvard, Vancouver, ISO, and other styles
9

Bektay, Yerkin, Gaukhar Turysbekova, Erzhan Mukanov, Akmurat Altynbek, and Bauyrzhan Shiderin. "BIOACTIVATION OF LEACHING SOLUTION FOR URANIUM IN-SITU RECOVERY." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/1.1/s03.024.

Full text
Abstract:
Technology of in-situ recovery (ISR) of uranium is using in Kazakhstan for increasing of production 15 times from 800 ton in 1998 till 22 000 ton in 2013. This ISR process is zero wastes technology. Investigations showed serious potential to improve results of ISR technology using biotechnology methods. Uranium in the ore body is usually presented as hexavalent (soluble) and tetravalent uranium (slightly soluble). To convert uranium into a soluble form, it is necessary to oxidize tetravalent uranium. Leaching solution of most of the uranium deposits of Kazakhstan contains ferrous iron. Oxidation of tetravalent uranium was obtained by the formation of ferric iron by iron-oxidizing bacteria A.Ferrooxidans. This bacteria oxidize ferrous iron till ferric iron. This was done at a uranium mine in two 20 m3 a flow bioreactors of new construction. In bioreactors was get activated leaching solution where take place oxidizing of ferrous iron. The redox of the leaching solution rose from 360 mV to 430-450 mV in bioreactors. The content of ferric iron increased from 0.1 g/l to 1.5 g/l and higher. Temperature of leaching solution was 10-140C in order to decrease cost for heating. Concentration of uranium in the productive solution increased by 20 % without adding additional sulfuric acid. Test with additional sulfuric acid give 40 % increasing of concentration of uranium in production solution. The costs of using the technology are 6-8 times lower in comparison with using chemical oxidizers (hydrogen peroxide).
APA, Harvard, Vancouver, ISO, and other styles
10

Qingliang Wang and Guanzhou Qiu. "Study on bacteria domestication and application of heap leaching in uranium mine." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5964149.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Bacterial leaching"

1

McCready, R. G. L., and V. Sanmugasunderam. The Noranda contract reports on the prefeasibility study of in-place bacterial leaching: a summation. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/307260.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Bacterial leaching' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography