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Dissertations / Theses on the topic 'Bentonite'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Ouyang, Shoung. "Sealing performance assessments of bentonite and bentonite/crushed rock plugs." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185275.

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Bentonite and mixtures of bentonite and crushed rock are potential sealing materials for high level nuclear waste repositories. The materials have been used to form cap layers to reduce infiltration for mined waste tailings and can also be used to construct clay liners for municipal as well as industrial waste managements. This study includes a systematic investigation of the sealing performance of bentonite and bentonite/crushed rock plugs under diverse conditions. American Colloid C/S granular bentonite and Apache Leap tuff have been mixed to prepare samples for laboratory flow testing. Bent
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2

ANDRADE, Daniela de Lourdes Anjos Coutinho Simões. "Influência das variáveis de processo na formação e propriedades de nanocompósitos polipropileno/bentonita." Universidade Federal de Campina Grande, 2009. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1691.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-09-12T12:56:27Z No. of bitstreams: 1 DANIELA DE LOURDES ANJOS COUTINHO SIMÕES ANDRADE - TESE (PPGEP) 2009.pdf: 2248344 bytes, checksum: 28a93ae4236853f59fe35037c2ab6f28 (MD5)<br>Made available in DSpace on 2018-09-12T12:56:27Z (GMT). No. of bitstreams: 1 DANIELA DE LOURDES ANJOS COUTINHO SIMÕES ANDRADE - TESE (PPGEP) 2009.pdf: 2248344 bytes, checksum: 28a93ae4236853f59fe35037c2ab6f28 (MD5) Previous issue date: 2009<br>A proposta deste trabalho foi preparar nanocompósitos de polipropileno/compatibilizante/bentonita, pelo método d
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3

Ju, Shuohui. "Electroosmotic dewatering of bentonite suspensions." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59868.

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Electroosmotic dewatering of Bentonite suspensions under conditions of constant DC voltage and constant DC current was investigated experimentally in a column 5 cm in diameter. The suspensions were prepared with CaCl$ sb2$ in distilled water with concentrations up to 1 M. The initial solid content was between 9.1 wt% and 26 wt% and the initial bed height ranged from 1.0 cm to 5.2 cm. Constant voltages from 4.0 V to 8.0 V and constant currents from 90 mA to 110 mA were used.<br>Electroosmosis removed 20-60% of the water with energy expenditures well below the energy required to vaporize the wat
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4

Howarth, Leslie George. "Rheological studies of bentonite dispersions." Thesis, University of Bristol, 1986. http://hdl.handle.net/1983/8cd3b134-1a67-40b0-a779-70559df77948.

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5

Magalhães, Vladmir Alvim Vieira. "Bentonita sódica com propriedade antibacteriana para inibição de biocorrosão em poços tubulares profundos /." Araraquara, 2016. http://hdl.handle.net/11449/141943.

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Orientador: Rodrigo Fernando Costa Marques<br>Banca: Miguel Jafelicci Junior<br>Banca: Wilton Rogério Lustri<br>Resumo: O presente trabalho consiste na funcionalização do fluido de perfuração conhecido como bentonita (BN) com grupos funcionais sulfidril (SH) provenientes do reagente 3- mercaptopropil-trimetoxissilano (MPTS) e nanopartículas de prata (NPs/Ag), visando a inibição da biocorrosão por oxidação de bactérias. Para tanto, a argila do tipo bentonita, constituída principalmente do argilomineral montmorilonita, foi modificada através de rota de inserção de organossilano e nanopartículas
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6

Hume, Harold B. "Gas breakthrough in compacted Avonlea bentonite." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ35063.pdf.

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7

Mollins, Lee Hamilton. "The design of bentonite-sand mixtures." Thesis, University of Leeds, 1996. http://etheses.whiterose.ac.uk/4122/.

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One-dimensional and isotropic swelling tests, hydraulic conductivity tests and triaxial compression tests have been performed at applied stresses up to 450kPa on sodium bentonite powder, sand and compacted sodium bentonite-sand mixtures (5, 10, and 20% bentonite by dry weight). This was done to investigate the use of bentonite improved soils for waste containment, and study the fundamental geotechnical properties of bentonite-sand mixtures using a classical soil mechanics approach. It was found that air dried bentonite powder swells to reach a state described by a single straight line on a plo
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8

Visudmedanukul, Punlop. "Solute Transport Through Cement-Bentonite Barriers." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/123466.

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9

Sherriff, Nicholas Kevin. "Radionuclide dissociation from bentonite colloid systems." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/radionuclide-dissociation-from-bentonite-colloid-systems(43918efc-26e4-4e41-a450-3e209c20340d).html.

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Deep geological disposal is a method of managing high level, long-­‐lived nuclear waste. It is a concept that many countries are exploring for the possibility of managing nuclear waste generated from power production. For deep geological disposal to be viable then areas where problems may surface have to be explored. Bentonite clay has been proposed as the material to be used for the backfill of the repositories. Its swelling properties ensure that it will expand to plug the bore holes that will be made for the waste, its impermeable nature restricts contact between groundwater and the waste p
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10

Schenning, Jessica A. "Hydraulic performance of polymer modified bentonite." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000403.

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11

Machado, Gabriel Gonzalo. "Variação espacial da carga interfoliar de esmectitas do depósto de bentonita de melo (norte do Uruguai): implicações nas propriedades físicas e na organofilização." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/75924.

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Para a modelização da distribuição espacial da carga interfoliar das esmectitas de Melo foram amostrados quatro perfis, sendo dois obtidos a partir de furos de sondagens e dois com amostras coletadas na frente da cava de exploração da ocorrência. Os perfis formam aproximadamente uma figura com a forma de um trapezoide isósceles possuindo uma mediana em torno de 100 m. Foi analisado um total de 21 amostras a partir dos perfis. A camada de bentonita na área estudada varia de 5 a 6 metros de espessura e no perfil localiza-se entre a camada de solo do topo e uma camada sotoposta de arenito de gran
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12

Nocon, Melody Schwartz. "Inorganic Sorption in Polymer Modified Bentonite Clays." Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/3850.

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In 1986, geosynthetic clay liners (GCLs) were invented and successfully used as a replacement for the soil layer in composite lining systems. In some applications an additive (polymer) is mixed with the bentonite to increase performance, especially in those that have low concentrations of sodium bentonite (EPA 2001).Studies showing significant increases in hydraulic conductivity values for bentonite in the presence of high salt concentrations are frequently documented and there is a risk of early breakthrough due to performance failure of the GCL clay component. (Ashmawy et al, 2002). It has a
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13

Wilson, James Charles. "The effect of iron on bentonite stability." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274751.

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14

Stepova, K. V., and A. Z. Kontsur. "LEAD ADSORPTION FROM WASTEWASTER BY MODIFIED BENTONITE." Thesis, Львівський національний університет ім. І.Франка, 2019. http://hdl.handle.net/123456789/6235.

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15

Baxter, Diane Yamane. "Mechanical Behavior of Soil-Bentonite Cutoff Walls." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27079.

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A soil-bentonite cutoff wall is a type of subsurface vertical barrier constructed by back-filling a trench with a mixture of soil, bentonite, and water. Although soil-bentonite cutoff walls are common, their mechanical behavior is not well understood. Current design procedures do not consider the final stress state of the consolidated soil-bentonite backfill or deformations in adjacent ground. The final stress state in the completed wall is important because it influences the hydraulic conductivity of the cutoff (Barrier 1995), the cutoff's susceptibility to hydraulic fracture, and the magnitu
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16

LEYAMA, MACAIRE. "Etude de l'ecoulement des suspensions de bentonite." Université Louis Pasteur (Strasbourg) (1971-2008), 2001. http://www.theses.fr/2001STR13050.

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Le but du travail etait l'etude de l'ecoulement de trois suspensions de bentonite de concentration en poids 6%, 8% et 10%, en conduite circulaire en aval d'un coude a 90\ de rapport de rayons 2,5. Une caracterisation rheologique a montre que les suspensions pouvaient etre modelisees par une loi de herschel-buckley thixotrope, dont l'augmentation de la concentration provoquait l'augmentation de la consistance et de la contrainte seuil, tandis qu'elle provoquait la diminution de l'indice d'ecoulement. Il a egalement ete montre que l'etat structurel des suspensions influence fortement leur loi de
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17

Mohammad, Noor. "Desiccation Cracking Behaviour in Thin Bentonite Layers." Thesis, The University of Sydney, 2020. https://hdl.handle.net/2123/22231.

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This thesis investigates the behaviour of desiccation cracks in thin bentonite layers under different conditions (initial water content, layer thickness, temperature and mixtures with kaolinite). For this, a comprehensive series of experiment was conducted as well as some theoretical models were developed. The theoretical model was developed based on the critical cracking thickness following the principles of linear elastic fracture mechanics (Chapter 4). This model was then used in the following chapters and validated with the experimental investigations. Also, hydraulic properties of the cr
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18

Ran, Chongwei. "Performance of fracture sealing with bentonite grouting." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186118.

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A bentonite grouting technology has been developed to meet the requirements of fracture sealing for nuclear waste isolation and environmental engineering. The work reported presents an experimental evaluation of the performance of the bentonite fracture sealing in densely welded tuff. Included are the study of grout stability and resistance to erosion, theoretical and numerical analyses of the grout penetration process, pressure distribution in the fracture during grouting, grout delivery distance, breakthrough pressure and rheological characterization. Bentonite suspensions with solids conten
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19

Ghazi, Ali Faisal. "Engineering characteristics of compacted sand-bentonite mixtures." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2015. https://ro.ecu.edu.au/theses/1615.

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Sand-clay mixtures are commonly used as a liner/barrier material in various engineering applications, such as construction of hydraulic and waste containments. Permeability, compressibility and strength are important properties of sand-clay mixtures and are often required for the design of the liner/barrier of the containments. In states like Western Australia, which is covered mostly by sandy soils, engineers face difficulties with economically sourcing clays for liner/barrier applications. Any reliable research finding that recommends an optimum clay content to be used with sandy soil can be
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20

Yang, Jinwen. "Hydromechanical behavior of pellets/bentonite powder mixture." Electronic Thesis or Diss., Marne-la-vallée, ENPC, 2023. https://these.univ-paris-est.fr/intranet/2023/TH2023ENPC0023.pdf.

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Dans le cadre du stockage géologique des déchets radioactifs de haute et moyenne activité, le mélange de pellet/poudre de bentonite est proposé comme matériau optionnel de scellement/remblayage. Les échantillons de mélange peuvent être endommagés par des fissures, ce qui compromet les performances à long terme du stockage géologique. Il est donc nécessaire de clarifier le comportement du mélange de pellet et de poudre. Des essais de compression oedométrique à succion contrôlée, de porosimétrie par intrusion de mercure (PIM) et de tomographie par microcomputation (μCT) ont été réalisés sur des
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21

Virgl, Vítězslav. "Vlastnosti formovacích směsí ze směsných bentonitů po opakovaném použití." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382285.

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High class mold is required for high quality castings. At present, the demands on molding materials are being extended by adding the strict requirement of environmentalists. A suitable variant that meets both demands are green sand molds. The goal of the thesis is to repeatedly cast experimental castings into molds made of 4 types of green sand mixtures. The technological properties of the molds will be compared, the degree of bentonite degradation will be assessed and the surface quality of castings will be assessed according to the amount of adherent molding mixture.
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22

Fermino, Danilo Marin. "Estudo das propriedades mecânicas, reológicas e térmicas de nanocompósito de HMSPP (polipropileno com alta resistência do fundido) com uma bentonita Brasileira." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-31102011-102319/.

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Este trabalho aborda o estudo do comportamento mecânico, térmico e reológico do nanocompósito de HMSPP polipropileno de alta resistência do fundido (obtido por radiação gama na dose de 12,5 kGy) e uma argila brasileira bentonítica do Estado da Paraíba (PB), conhecida como chocolate com concentração de 5 e 10 % em massa em comparação a uma argila americana, Cloisite 20A. Foi utilizado nesse nanocompósito o agente compatibilizante polipropileno graftizado com anidrido maleico PP-g-AM com 3 % de concentração em massa, através da técnica de intercalação do fundido utilizando uma extrusora de dupl
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23

RODRIGUES, Katyane. "Desenvolvimento e caracterização de nanocompósitos de bentonita contendo filtros-solares." Universidade Federal De Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/18387.

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Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2017-03-08T18:16:41Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Katyane 2.pdf: 4899390 bytes, checksum: 591b77920f0440069d4c7a3d4ec83b37 (MD5)<br>Made available in DSpace on 2017-03-08T18:16:41Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Katyane 2.pdf: 4899390 bytes, checksum: 591b77920f0440069d4c7a3d4ec83b37 (MD5) Previous issue date: 2013-02-26<br>Facepe e Capes<br>A radiação UV compreende uma região d
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Ayar, Engin Mazlum Süleyman. "Bentonit kili kullanılarak su ortamından fosforun adsorbsiyon ile giderimi /." Isparta : SDÜ Fen Bilimleri Enstitüsü, 2009. http://tez.sdu.edu.tr/Tezler/TF01287.pdf.

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25

Camargo, Karina Retzlaff. "Avaliação da condutividade hidráulica e da resistência ao cisalhamento de misturas solo-bentonita: estudo de caso de um aterro sanitário localizado em Rio Grande (RS)." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-18062013-110028/.

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A utilização do solo natural compactado com bentonita empregado em camadas impermeáveis para retenção de contaminantes é bastante usual para aterros sanitários. Neste trabalho são apresentados resultados de ensaios condutividade hidráulica e de resistência ao cisalhamento, realizados em equipamentos triaxiais. Além do solo natural, foram utilizadas misturas solo-bentonita nos teores de 2%, 4% e 6%. O solo arenoso ensaiado é encontrado na Planície Costeira Sul do Estado do Rio Grande do Sul. Os valores de condutividade hidráulica diminuiram tanto com o acréscimo do teor de bentonita, quanto com
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26

Wold, Susanna. "On diffusion of organic colloids in compacted bentonite." Doctoral thesis, KTH, Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3522.

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<p>The main issue of this thesis was to obtain information ondiffusion and sorption behaviour on organic colloids incompacted bentonite through experimental studies. It was tostudy if bentonite is an efficient barrier for organic colloidsor not. If colloids diffuse into bentonite in sufficientconcentrations, the speciation and sorption characteristics ofdiffusing radionuclides will change. Colloids might facilitatetransport, especially of radionuclides immobilised by strongsorption on bentonite.</p><p>Laboratory experiments were performed to determine thestability of humic substances (HS) and
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27

Uskarci, Togan. "Behaviour Of Bentonite Suspensions In Non-aqueous Media." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607161/index.pdf.

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Bentonite is a smectite type clay mineral and swells in water. In this thesis, the effect of acetone, methyl-ethyl ketone, n-hexane on the properties of bentonite was determined by thermal analysis and water absorption tests. The tests indicated no significant change with treating bentonite with organic liquids. Because of the swelling property, only small amount of bentonite can be suspended in water. This may limit certain applications of bentonite. In this thesis, feasibility of suspending large quantities of bentonite in a non-aqueous media was studied. The concentrations for a pumpable h
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Takai, Atsushi. "Geoenvironmental Reliability of Soil-Bentonite Mixture Cutoff Walls." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188847.

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Wong, Eric 1975. "Surfactant-enhanced electrokinetic remediation of dichlorobenzene-contaminated bentonite." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31077.

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A dense nonaqueous phase liquid, o-dichlorobenzene (o-DCB) was removed by surfactant-enhanced electrokinetic remediation from saturated bentonite clay. The surfactant was Antarox BL-236, a nonionic surfactant with a solubilization capacity of 0.052 g DCB/g surfactant. The 9 cm long bed, which initially contained 10 wt % bentonite and a dispersion of o-DCB (2910 or 5821 ppm) in water, was placed in a horizontal cylinder (5 cm ID) and held at each end by a supported filter paper. Carbon disk electrodes were located in compartments at each end of the bed. Surfactant solution or distilled water wa
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Sánchez, González Sandra. "The swelling pressure of bentonite and sand mixtures." Thesis, KTH, Skolan för kemivetenskap (CHE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158511.

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The compacted bentonites are used as buffer and backfill materials for engineering barriers for high-level nuclear waste repositories located underground. For this purpose, it is very important to evaluate the swelling characteristics of this clay. The swelling capacity is one of the most important properties of the bentonite clay. The swelling behaviour is due two mechanisms, the crystalline swelling and the osmotic swelling. These mechanisms produce an increase in the distance between the layers of montmorillonite which is one component of bentonite. The result of the swelling capacity is th
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Ng, Man Yin Albert. "Modelling of hydraulic fracturing in cement bentonite geomaterials." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/283851.

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Ran, Chongwei 1956. "Effectiveness of rock fracture sealing with bentonite grouting." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278016.

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A new fracture grouting technology has been developed to meet the requirements of high-level nuclear waste isolation. Bentonite fracture grouting tests are performed on a fracture model, made of circular acrylic plates with outer diameter of 30 cm and a central injection hole of 2.5 cm diameter. Suspensions with bentonite concentration of 9% to 31% have been injected into fractures with apertures of 9 to 39 microns under injection pressures less than 0.5 MPa. After grouting, the hydraulic conductivities of the fractures are reduced from the 10-1 to the 10-5 cm/s level. When the suspension is t
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Auboiroux, Michel. "Affinité de différents cations métalliques (Co2+, Ni2+, Cu2+, Zn2+, Cd2+ et Pb2+) pour une montmorillonite calcique : expérimentation et applications." Orléans, 1998. http://www.theses.fr/1998ORLE2025.

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L'etude experimentale des interactions entre metaux lourds (co, ni, cu, zn, cd, pb) et une montmorillonite purifiee calcique est menee en considerant differentes conditions experimentales (force ionique moderee ou elevee, argile en suspension ou compactee). L'argile et les solutions utilisees sont prealablement caracterisees. Le mecanisme d'echange ionique est mis en evidence par analyse quantitative xps d'echantillons echanges avec cd et pb. Le traitement des resultats experimentaux obtenus en solutions de force ionique moderee et constante, par un modele d'echange ionique et sa fonction puis
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Colmenares, Montanez Julio Estaban. "Suction and volume changes of compacted sand-bentonite mixtures." Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/7775.

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Krol, Magdalena M. "Implications of trichloroethylene diffusion through soil-bentonite slurry walls." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0019/MQ58050.pdf.

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36

Durham, J. "The prediction of shear strength in bentonite/cement groups." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/7435.

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Bentonite/cement grouts and slurries are used in the civil engineering industry in various ground engineering processes. The specifications usually require a minimum compressive strength or shear strength at 28 days age. The interaction between the materials namely bentonite, cement and water is complex; both the bentonite content and the cement content of the grout affect the development of shear strength. An investigation of the development of shear strength has been made for a range of grouts with bentonite contents from 5% to 20% by weight of water and water/cement ratios from 4 to 12. The
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Ishidera, Takamitsu. "Study on diffusion behavior of radionuclides in compacted bentonite." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/57264.

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38

Britton, Jeremy Paul. "Soil-Bentonite Cutoff Walls: Hydraulic Conductivity and Contaminant Transport." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28642.

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Soil-bentonite cutoff walls are commonly used to contain contaminants in the subsurface. A key property in determining the effectiveness of a cutoff wall is its hydraulic conductivity. There are important difficulties and uncertainties regarding the accuracy of commonly used methods of measuring the hydraulic conductivity of cutoff walls. When predicting contaminant transport through cutoff walls, common practice is to use the average hydraulic conductivity of the wall. There are some cases, however, such as circumferential cutoff walls with inward hydraulic gradients, where it is also imp
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PUMA, SARA. "Chemico-mechanical improvement of bentonite barriers for pollutant containment." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2507922.

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Pollution control represents one of the main problems of public interest in all industrialised countries. Since the 1970s, when the engineering of waste containment began, the overall objective of Environmental Geotechnics was to limit contaminant discharge to groundwater and subsoil. Since the 1990s design engineers and environmental agencies have shown a growing interest in the use of geosynthetic clay liners (GCLs) as an alternative to compacted clays in cover systems or in bottom lining of waste containment facilities because they have very low hydraulic conductivity to water and relativ
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NASCIMENTO, Neyber Fádio Cavalcanti. "Reologia de argilas bentoníticas do Estado da Paraíba aditivadas com MgO para uso em tintas base água." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1122.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-07-09T13:22:22Z No. of bitstreams: 1 NEYBER FÁDIO CAVALCANTI NASCIMENTO - DISSERTAÇÃO (PPGCEMat) 2016.pdf: 1783822 bytes, checksum: 978c857fd44cc5a5c4f6d54a35a5e8a3 (MD5)<br>Made available in DSpace on 2018-07-09T13:22:22Z (GMT). No. of bitstreams: 1 NEYBER FÁDIO CAVALCANTI NASCIMENTO - DISSERTAÇÃO (PPGCEMat) 2016.pdf: 1783822 bytes, checksum: 978c857fd44cc5a5c4f6d54a35a5e8a3 (MD5) Previous issue date: 2016-02-27<br>Capes<br>Devido a suas propriedades reológicas, uma grande quantidade de bentonitas são empregadas como aditivos pa
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Tiranarat, Chanan. "An investigation of the use of modified clay to remove colour from process wastewater." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269717.

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42

Jozja, Nevila. "Etude de matériaux argileux albanais : caractérisation multi-échelle d'une bentonite magnésienne : impact de l'interaction avec le nitrate de plomb sur la perméabilité." Orléans, 2003. https://tel.archives-ouvertes.fr/tel-00003740.

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Ce travail s'inscrit dans le cadre des études sur l'interaction argile/polluant, concernant l'utilisation des argiles comme barrière d'un site de stockage de surface. Le travail présenté se propose de relier les variations de la perméabilité avec les modifications structurales et microtexturales pouvant être induites par la fixation d'un cation métallique sur une argile. Parmi 3 matériaux argileux albanais présélectionnés, celui de Prrenjas, formé par pédogenèse puis sédimentation continentale aux dépens d'une roche mère (ultrabasique), a été choisi en raison de ses caractéristiques proches d'
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43

Diot, Frédéric. "Application des techniques séparatives basées sur le magnétisme et l'électricité à la valorisation des fines de sable de fonderie." Vandoeuvre-les-Nancy, INPL, 2001. http://www.theses.fr/2001INPL598N.

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Le but principal de ce travail porte sur le recyclage de sable de fonderie (séparation quartzbentonite par voie sèche). La bibliographie fait une mise au point sur les différentes méthodes de séparations (magnétique, pneumatique et électrostatique) et les sables de fonderie. L'étape de la caractérisation minéralurgique du sable à vert montre que l'argile (bentonite) est concentrée principalement dans la fraction de taille inférieure à 40Jlm. L'électrostatique est la voie retenue pour la récupération. Les différents tests effectués montrent qu'il est possible au niveau du laboratoire de recycle
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44

Muller, John. "Etude du cycle biogéochimique du sélénium dans l'environnement." Nantes, 2008. http://www.theses.fr/2008NANT2082.

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Le but de ce travail est de déterminer le cycle biogéochimique du sélénium, et plus particulièrement des sélénites, dans un environnement proche de la surface. Pour cela, nous avons réalisé des études de sorption sur différentes phases minérales en système mono et multi-phasiques. Nous avons également réalisé des expériences pour étudier le devenir du sélénium dans un système-sol_plantes_microorganismes. (i) Les expériences de sorption des sélénites sur différentes phases minérales ont validé la méthode dite des « membranes de dialyse » et ont montré qu'il n'y avait pas d'additivité des capaci
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45

Molera, Marimon Mireia. "On the sorption and diffusion of radionuclides in bentonite clay." Doctoral thesis, KTH, Chemistry, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3390.

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46

Sunde, Marius. "Organic binder as a substitute for bentonite in ilmenite pelletization." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18840.

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TiZir Titanium &amp; Iron produces high titania slag and high purity pig iron from ilmenite in Tyssedal. The ilmenite is pelletized before smelting. Bentonite is added to the ilmenite concentrate as a binder to give the pellets strength and durability. Bentonite consists mainly of silica and alumina, which are considered as impurities in the high titania slag production. The use of organic binder has therefore been suggested as a substitute for bentonite.This work has focused on developing knowledge on the pelletization process and investigating various organic binders.Two methods of agglomera
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47

Barclay, D. Scott. "Batch treatment of textile wastewaters with modified bentonite adsorbent blends." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0017/MQ55652.pdf.

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48

Park, Sang-il. "Thermal conductivity of bentonite-bonded molding sands at high temperatures." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/18386.

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49

Dzene, Liva. "Synthesis of Scleroglucan-Smectite Composite Based on Porto Santo Bentonite." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30638.

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In this thesis, a smectite rich bentonite ore deposit from Porto Santo Island (Portugal) was characterized and then applied to prepare clay-biopolymer nanocomposite material. Natural clay sample is mainly composed of Fe rich smectite, having also feldspar, calcite and magnetite-maghemite minerals. Both montmorillonite from the clay source repository (SWy-2) and the Porto Santo bentonite were used for the nanocomposite synthesis. An exocellular polysaccharide – scleroglucan was used as a biopolymer. The X-ray diffraction and transmission electron microscopy results show that smectite is well di
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50

Hurel, Charlotte. "Rétention d'éléments trace sur une bentonite : étude expérimentale et modélisation." Nice, 2002. http://www.theses.fr/2002NICE5801.

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Le stockage des déchets radioactifs en formation géologique est envisagé en France. L’altération des déchets peut mobiliser le polluant, qui pourrait alors migrer vers la géosphère. Des argiles sont envisageables comme barrière anti-pollution étant donnée leur faible perméabilité et leur forte capacité de rétention. Un modèle thermodynamique de complexation de surface basé sur le principe d’additivité est proposé pour prédire le comportement des polluants au contact des argiles. Ce principe permet une détermination indépendante de chaque paramètre du modèle, et limite l’ajustement de données c
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