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Dissertations / Theses on the topic 'Metal Extraction'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Trenholme, W. J. F. "Metal-organic frameworks for platinum group metal extraction." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/32795/.

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This Thesis describes the synthesis and characterisation of a variety of functionalised metal-organic frameworks (MOFs). These MOFs have been used for the extraction of platinum group metal (PGM) compounds from aqueous and organic solvents and for the storage of gases such as CO2, CH4 and the C2 hydrocarbons. Chapter 1 contains an introduction to PGM properties and uses with specific focus on the chemical properties which allow for separation of PGMs from base metal compounds and for separation between different PGM compounds. The synthesis and structure prediction of MOFs is then introduced,

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2

Pornsinlapatip, Pornpun. "Flow-injection solvent extraction of metal chelates." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284394.

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3

Lunkov, Sergey. "Modelling metal complexation in solvent extraction systems." Thesis, Curtin University, 2013. http://hdl.handle.net/20.500.11937/2018.

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This thesis represents a theoretical investigation of synergistic solvent extraction of transition metal ions based on models for the commercial used components, namely LIX63 and Versatic10 acid. Quantum mechanical studies of oxime isomerisation have been conducted in order to understand the thermodynamic and kinetic properties of the syn/anti interconversion of LIX63, which is found to favour an oligomeric form in non-polar solvents.

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4

Eapen, M. J. "Solvent extraction of some transition metal chelates." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1986. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3279.

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5

Ge, Xinlei. "Extraction of Metal Values : Thermodynamics of Electrolyte Solutions and Molten Salts Extraction Process." Doctoral thesis, Stockholm : Skolan för industriell teknik och management, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10638.

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6

Healy, Mary Rose. "Outer-sphere interactions in metal solvent extraction systems." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28712.

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This work aims to define the modes of action of a series of metal extraction ligands with particular focus on how these depend on the formation of supramolecular assemblies. Though solvent extraction processes are well established industrially often the understanding, particularly of the metal coordination chemistry, is less so. A greater understanding of a variety of solvent extraction systems can lead to the development of stronger and more specific extractants. Chapter 2 examines the role of inter-ligand interactions in the extraction of copper by phenolic oximes and pyrazoles. Computationa

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7

Brown, Stanley. "Heavy metal detoxification of sewage sludge." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302700.

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8

Davis, Lauren Elizabeth. "Extraction : one woman's epilepsy." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/3281.

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9

Rashid, Salman Ghanem. "Studies on copper extraction with hydroxyoxime extractants for the design of hollow fibre membrane based extraction processes." Thesis, University of South Wales, 1999. https://pure.southwales.ac.uk/en/studentthesis/studies-on-copper-extraction-with-hydroxyoxime-extractants-for-the-design-of-hollow-fibre-membrane-based-extraction-processes(7e631b77-71e2-4d6e-8c03-4636d42f9f69).html.

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This work has included a review of the most relevant aspects of measurement techniques and mathematical models proposed in the literature to assess the equilibrium and mass transfer data of metal extraction by the use of chelating agents. The limitations of these techniques and models have been highlighted. Three chelating extractants diluted in EscaidllO were used to study the extraction equilibrium of copper. The extractants are 5-nonylacetophenone oxime (LIX84®), 5- dodeylsalicylaldoxime (LIX860®) and 50/50 v/v mixture of both oximes (LIX984®). The copper concentration changes in the aqueou

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10

Boodhoo, Kishore. "Functionalised cyclodextrins for multi-metallic assemblies : towards metal extraction." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273554.

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11

Smith, Kate Jennifer. "Ditopic ligands for the extraction of divalent metal salts." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/12982.

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This thesis extends earlier work at the University of Edinburgh aimed at opening up new flowsheets for the hydrometallurgical recovery of base metals using tetradentate ligands which are capable of transporting metal salts {both a metal cation and its attendant anion(s)}. Prototypes were based on salicylaldimine derivatives of diamines, “salen” ligands in which coordination of a metal dication releases the two phenolic protons which are captured by pendant secondary amine groups generating a preorganised dicationic binding site for the anion(s). The thesis initially deals with the design, synt

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12

Barker, Michael H. "Electrochemistry at liquid/liquid interfaces for metal ion extraction." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367192.

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The aim of this project was to produce a selective extraction system for the separation of precious metal ions from waste electrolyte streams utilising liquid/liquid electrochemical techniques. During the course of this project the work partitioned into three different aspects of charge transfer: electron transfer, ion transfer and membrane studies. Some fundamental physicochemical properties of liquid/liquid systems were explored. For electron transfer reactions the dependence of the rate of electron transfer on supporting electrolyte concentration in the organic phase for the water/1,2-DCE i

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13

Ca, Diep Vu. "NANOSTRUCTURED ASSEMBLIES FOR SOLID PHASE EXTRACTION OF METAL IONS." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1107552000.

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14

Chamupathi, Virittamulla Gamage. "Role of the interface in metal solvent extraction kinetics." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184256.

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Interfacially active reagents are utilized in metal solvent extraction processes and it is therefore important to understand the role of the liquid-liquid interface in the study of the kinetics and equilibria of extraction. The diffusion problems encountered in the traditional apparatus were overcome by using a high speed stirring apparatus. The microporous teflon membrane phase separator permitted more accurate measurements of interfacial areas, characterization of extraction kinetics of metal chelates, and a greater understanding of the phase separation mechanism. In contrast to the neutral

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15

Wang, Jin 1954. "Extraction of heavy metals with supercritical carbon dioxide : a novel approach to heavy metal analysis and decontamination." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39890.

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The technique of extraction with supercritical carbon dioxide (SC-CO$ sb2$), which is now used routinely for the recovery of non-polar analytes from a variety of liquid and semipermeable solid media, was extended to the efficient extraction of metal ions. Measurements of the solubilities in SC-CO$ sb2$ corroborated the hypothesis that the non-polar character of a series of tetraalkylammoniun dialkyldithiocarbamates ion pairs was influenced (i) primarily by the chain length of the alkyl substituent(s) on the carbamate nitrogen and (ii) to a lesser extent, by the chain length of the alkyl substi

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16

Premaratne, Wijendra A. P. Jeewantha. "Mineral chemistry and metal extraction of Sri Lanka beach sands." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404128.

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17

Mead, D. A. "Investigation of the supported liquid membrane process for metal extraction." Thesis, University of Hertfordshire, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376472.

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18

Doidge, Euan Douglas. "Designing reagents for the solvent extraction of critical metal resources." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31070.

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The work in this thesis aims to develop new systems for the more efficient recovery of metals from aqueous solution using solvent extraction. Understanding the underlying coordination chemistry to improve hydrometallurgical methods is crucial in order to meet the demand for critical metals for use in modern technologies, reduce the environment impact of recovery from primary mining deposits, and recycle valuable metals from secondary sources (e.g. mobile phones, WEEE). Chapter 2 examines the use of a simple primary amide that can load gold and other chloridometalates into a toluene phase throu

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19

Tucker, Kate Louise. "Heavy metal extraction using advanced liquid-liquid style partitioning systems." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/heavy-metal-extraction-using-advanced-liquid--liquid-style-partitioning-systems(6a238cb4-94cf-4fa8-bffe-d1a1b70adaa6).html.

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Understanding the behaviour of heavy metals involved in the nuclear fuel cycle is of paramount importance to the reprocessing and storage of spent nuclear fuel. These studies have attempted to obtain a greater understanding of the fundamental chemistry of these systems, by investigating extraction performance and speciation in current (PUREX) and proposed (GANEX) extraction processes. Various complexes have been shown to exist in the post-extracted organic fraction of the systems analysed. For Zr(IV), U(VI) and Np(VI) separated from aqueous nitric and hydrochloric using TBP, the complexes [Zr(

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20

Hildreth, Scott A. "Statistical SPICE parameter extraction for an N-Well CMOS process /." Online version of thesis, 1995. http://hdl.handle.net/1850/12177.

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21

Galbraith, Stuart G. "Ditopic ligands for the selective solvent extraction of transition metal sulfates." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/10911.

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The thesis considers the development of new reagents which could transport transition metal <i>salts</i> in extractive hydrometallurgy and addresses the ligand design features which are needed to control the strength and selectivity of binding of both a particular metal cation and its attendant anions(s). Extractive metallurgy of base metals is surveyed in chapter 1 and suggests that more efficient recovery processes are needed. One new approach, which could lead to much better materials balances in many cases, is to use hydrometallurgical techniques which involve co-extraction and transport o

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22

Chatreewongsin, Urai. "Metal Extraction From Soil Samples By Chelation in a Microwave System." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/26982.

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This work involves the combination of chelation and microwave extraction as a technique for extracting adsorbed metals in soil. It has been termed in this work, Chelate Assisted Microwave Extraction (CAME). Unlike other extraction methods, CAME is able to differentiate between anthropological and geological trace metals. The method has been applied to major sample matrices included three types of soils (Bertie Sandy Loam, Davidson Silty Clay, and Davidson Clayey Loam) as well as sea sand, alumina, and iron oxide. In order to investigate the effects of sorptive coatings on metal concentrations

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23

DESHPANDE, SUSHILENDRA ARUN. "FEATURE EXTRACTION AND INTRA-FEATURE DESIGN ADVISOR FOR SHEET METAL PARTS." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1070392705.

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24

Howard, Maury Elizabeth. "Characterization of synthetic biopolymeric chelators for trace metal extraction and recovery /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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25

Jabbour, Rabih Elie. "Characterization of selected immobilized metal-ions using solid phase extraction sorbents." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282773.

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Solid phase extraction (SPE) has been developed as an alternative to liquid-liquid extraction (LLE) in the sample preparation process. The advantages of SPE over LLE are that it is a more useful, reliable tool for sample preparation, which offers greater selectivity. The selectivity of an SPE sorbent is vital for the isolation of analyte from a biological matrix containing a myriad of interferences. The use of conventional ion exchange SPE for such an extraction process might not be adequate due to the adverse effects of interfering ions. Metals immobilized on various modified silicas were inv

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26

Salazar, Ariza Juan Felipe. "Development of chelating materials for localized metal extraction in neurodegenerative diseases." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10293.

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L'homéostasie des métaux dans le cerveau joue un rôle crucial dans la santé du système nerveux central. Les recherches actuelles sur les maladies neurodégénératives suggèrent que la dyshoméostasie des métaux contribue activement à la pathogenèse et à la progression d'affections telles que les maladies de Parkinson et d'Alzheimer. L'excès de métaux libres dans le cerveau peut avoir des effets délétères, notamment des dommages oxydatifs par la production d'espèces réactives oxygénées (ROS), l'inflammation et la perturbation des processus biologiques en raison de l'altération des conformations de

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27

Diffin, B. "The mechanism of metal detoxification of waste activated sludge by pH depression." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353776.

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28

Angarita, Fonseca Maria Paula. "Electrolytic extraction of a metal from its metal compound: estimates of optimal energy requirements and their consequences." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98004.

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Thesis: S.M. in Technology and Policy, Massachusetts Institute of Technology, Engineering Systems Division, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 62-66).<br>To ensure the sustainability of a world whose growing population demands more materials, products, and energy, we must closely examine the sustainability of the industries that supply them. Metal-making industries encounter an opportunity space at the extraction stage of a metal life cycle when aiming at making a significant impact in energy efficiency and carbon emission mitigation. W

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29

Adams, Robert Jonathan Watt. "The extraction of caesium and cobalt(II) from solution using inorganic ion exchangers in electrochemical ion exchange." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385171.

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30

Copham, Piers Martin. "Rotating electrodes in molten salt electrowinning." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330202.

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31

Mebrahtu, Fanuel M. "Transport and extraction of Au(lll) using thiourea ligands." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50206.

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Thesis (MSc)--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: A series of di- and mono-substituted acyl(aroyl) thioureas were examined for the extraction and transportation of Au(III). Two-phase metal ion extraction experiments were employed to investigate the extraction behaviour of these ligands. The effect of varying ligand concentration on the extraction trend of these ligands was investigated. The results show that the different substituent groups on the benzoyl ring can affect the extraction pattern of the metal. Furthermore, the alkyl substituents on the thiourea moiety and va

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32

Lopian, Tobias. "Characterization of a metal-extracting water-poor microemulsion." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT206/document.

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Le recyclage des terres rares à partir de déchets électroniques n'a toujours pas trouvé une réalisation industrielle significative. L'une des raisons est le manque de procédures de séparation optimisées en raison de connaissances fondamentales médiocres sur ces systèmes. En raison des similitudes chimiques et physiques de ces métaux, la conception d'une formulation efficace, adaptative et prédictive est toujours hors de portée des possibilités. L'interprétation supramoléculaire de la formation complexe dans la phase organique est de plus en plus importante au cours des dernières années. C'est

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33

Squires, Clare. "Ligand self assembly to enhance the strength and selectivity of metal extraction." Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/14470.

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The strength and selectivity of commercial phenolic oxime copper extractants are thought to be due to the hydrogen-bonded <i>pseudo</i>-macrocycle which this ligand forms around copper. This thesis investigates the role of hydrogen-bonding of sulfonamido ligands to determine the importance of ligand association prior to and upon complexation. Chapter 2 deals with the coordination chemistry of a series of 11 relatively simple bidentate monosulfonamidodiamine ligands. The solid state structures of these ligands are difficult to predict and illustrate that a surfeit of hydrogen-bond donors and ac

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34

Bauer, Caroline. "Metal ion extractant in microemulsion : where solvent extraction and surfactant science meet." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20041/document.

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Le but du travail est d'étudier la structure supramoléculaire de mélanges de tensioactif hydrophile, n-octyl-beta-glucoside (C8G1), et d'un extractant d'ions métalliques hydrophobe, le tributyl-n-phosphate (TBP), en présence d'eau, d'huile et de sels. Les systèmes classiques d'extraction ionique (composés d'une phase aqueuse, d'huile et d'extractant dont le but est d'extraire un soluté de la phase polaire sont passés en revue. L'aspect colloïdal et les transitions de phases que l'on retrouve dans ces systèmes sont souvent décrits singulièrement. Nous avons transposé l'approche « diagramme de p

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35

Rinsant, Damien. "Elaboration de matériaux hybrides fonctionnalisés de type MOFs pour l’extraction sélective de l’uranium." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS062.

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L’offre en combustible nucléaire à base d’uranium est un enjeu clé de la stratégie française de production d’électricité, d’autant plus que la demande en uranium naturel continuera à augmenter dans un futur proche. Il y a donc un intérêt à proposer de nouveaux procédés d’extraction de l’uranium plus efficaces et plus écologiques que ceux utilisés actuellement. L’objectif de cette thèse est donc de valoriser l’uranium issu des lixiviats de minerais par des procédés de séparations solide-liquide avec des matériaux de type Metal Organic Framework (MOF). Les MOFs sont des matériaux hybrides, crist

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36

Ager, Patrick. "Mobilizationpurging of aqueous metal ions into supercritical carbon dioxide." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20553.

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The technology of supercritical fluid extraction (SFE) offers the opportunity to efficiently extract both relatively non-polar analytes as well as ionic materials (such as metal ions) that can be mobilized with the addition of complexing reagents. The nebulizer of a conventional flame atomic absorption spectrometer (FAAS) was modified to extend the range of metals amenable to on-line detection. The flow injection thermospray-FAAS (FI-TE-FAAS) interface provided efficient detection for a variety of less volatile elements (Co, Cr(III), Cr(VI), Fe, Ni, Mn and Al) present as ions in aqueous media

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37

Murthy, Challa Venkata Ramachandra. "Modelling of the rate of stripping of zinc from di(2-ethylhexyl) phosphoric acid in n-heptane." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/8688.

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38

Stewart, Neil Stuart. "The technology and control of mining in Roman Britain." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249933.

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39

Ho, Mark D. "Application and assessment of sequential extraction for trace metal characterization of contaminated soil." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0009/MQ40907.pdf.

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40

Uheida, Abdusalam. "Selective separation of metal ions by solvent extraction, liquid membranes and magnetic nanoparticles /." Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3871.

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41

Chen, Fu-Yih Jeffrey. "Characterization of the liquid-liquid interface and its influence on metal extraction processes." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186977.

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8-Mercaptoquinoline (QSH) exhibited substantial interfacial activity in its neutral form. The interfacial activity of QSH may stem from its zwitterionic form QH⁺S⁻. The interfacial activities of Ni-HPMBP system are in the order Ni(PMBP)₂ > PMBP⁻ > HPMBP. The interfacial rate constant of formation reaction is 4 times greater than the bulk value. The bulk and interfacial rate constants for dissociation reaction of Ni(PMBP)₂ are essentially the same. The centrifugal partition chromatography (CPC) inefficiency as measured by the quantity channel equivalent of a theoretical plate (CETP), reflects t

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42

Okino, Fumito. "Study on the Instability Analysis of the Liquid Metal and Application for the Fusion Energy Conversion System." Kyoto University, 2014. http://hdl.handle.net/2433/192209.

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43

Kong, Frederick. "Silicon-on-sapphire MOSFET parameter extraction by small-signal measurement /." [St. Lucia, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17051.pdf.

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44

Sotiropoulos, Dimitrios. "Rate controlling mechanisms in the extraction of zinc and copper with a supported liquid membrane." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/8811.

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45

Sylvester, Paul. "Extraction of cobalt and other metal ions from aqueous solutions using inorganic ion exchangers." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278137.

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46

Croxtall, Ben. "The application of solid phase extraction in organic synthesis using fluorous derivatised metal catalysts." Thesis, University of Leicester, 2003. http://hdl.handle.net/2381/30076.

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This thesis describes the synthesis, characterisation and coordination chemistry of a variety of fluorinated ÃŸ-diketonate ligands (I) and carboxylate ligands (II), the catalytic activity of the resultant metal complexes for oxidation and C-C bond forming reactions, and an evaluation of fluorous methodologies for catalyst/product separation. (Fig. 3706) Chapter 1 introduces the concept and application of fluorous methodologies, including fluorous biphase catalysis and fluorous reverse phase silica gel (FRPSG), as alternative approaches to product/catalyst separation in homogeneous catalysis. C

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47

McKim, Artie S. "Synthesis and Alkali Metal Extraction Properties of Novel Cage-Functionalized Crown Coronands and Cryptands." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc277666/.

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48

Marshall, Karen L. "Chelate Assisted, Pressurized, Liquid Extraction for the Removal of Adsorbed Metal Contaminants From Soils." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/78001.

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Chelate Assisted, Pressurized, Liquid Extraction (CAPLE) has been developed in our laboratory as an efficient, separation-based, extraction methodology for heavy metals in soils. Unlike current extraction methods used in environmental determination of contaminated soils, CAPLE is able to selectively remove adsorbed metals from the soil matrix without requiring the total destruction of the sample. By not fracturing the soil matrix particles, as with hot acid digestion methods, geologically bound metals are not liberated in the CAPLE process. This unique feature of CAPLE allows us to quantify

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49

Griffin, Jonathan. "Transition metal oxides and their use as hole extraction materials in organic photovoltaic devices." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/5125/.

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One of the limiting factors in the efficiency of organic photovoltaic devices utilising new generations of donor polymers is the ability to obtain Ohmic contacts between the electrodes and the organic layers. This is due to the fact these new donor polymers often have deeper energy levels meaning that at the interfaces between the organic layer and the electrode contact barriers are formed. PEDOT:PSS is the current benchmark material that is used to reduce or remove these contact barriers however even this material has too shallow an energy level and has serious issues with long term stability

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50

Manzke, Yori. "Non-local, local, and extraction spin valves based on ferromagnetic metal/GaAs hybrid structures." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17230.

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Im Gebiet der Spin-Elektronik wird der Spin des Elektrons zusätzlich zu seiner Ladung für Bauelementkonzepte ausgenutzt. Hierbei ist die effiziente elektrische Erzeugung einer Spinakkumulation in einem halbleitenden Material von großer Bedeutung. Die Erzeugung der Spinakkumulation kann mithilfe eines ferromagnetischen Metall-Kontaktes erfolgen. Wird eine elektrische Spannung an die Grenzfläche zwischen dem ferromagnetischen Metall und dem Halbleiter so angelegt, dass spinpolarisierte Elektronen vom Metall in den Halbleiter fließen, spricht man von elektrischer Spininjektion. Bei einer Umkehrun

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