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Dissertations / Theses on the topic 'Flotation. Adsorption'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Rusanova-Naydenova, Daniela. "³¹P- and ⁶⁵Cu- solid state NMR studies of Cu(I) di-alkyl-dithiophosphates : complex formation mechanism on synthetic chalcocite surfaces /." Luleå, 2004. http://epubl.luth.se/1402-1757/2004/04.

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2

Potapova, Elisaveta. "Studies on the adsorption of flotation collectors on iron oxides /." Luleå : Luleå university of technology, 2009. http://pure.ltu.se/ws/fbspretrieve/3359292.

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3

Zhang, Wencai. "SURFACE CHEMISTY STUDY OF MONAZITE FLOTATION IN COAL REFUSE SYSTEMS." UKnowledge, 2017. http://uknowledge.uky.edu/mng_etds/34.

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Rare earth mineral recovery from alternative resources such as coal and coal byproducts is increasingly important to provide an opportunity for economic recovery from U.S. sources. Currently, China produces the majority of the 149,000 tons of rare earth elements used annually worldwide of which the U.S. imports 11% or around 16,000 tons. There are no significant mining operations producing rare earth elements in the U.S. However, there are many U.S. sources containing rare earth minerals such as monazite including heavy mineral sand and phosphate operations. Monazite mineral particles of a few

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4

Karlkvist, Tommy. "Selectivity in Calcium mineral flotation - An analysis of novel an existing approaches." Doctoral thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63132.

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5

Micheau, Cyril. "Tensioactif carboxylique polyéthoxylé pour la flottation ionique : étude fondamentale de la solution à la mousse." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20242/document.

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La flottation ionique est un procédé de séparation permettant d'extraire et de concentrer des ions dans une mousse formée à l'aide d'un tensioactif. Pour les systèmes classiques, la forte interaction entre les ions et le tensioactif collecteur entraîne généralement la formation de précipités. Une fois la mousse collapsée, le résidu solide récupéré nécessite un traitement particulier pour permettre sa valorisation ou son conditionnement. Afin de remédier à cet inconvénient, ce travail propose d'utiliser comme collecteur un tensioactif carboxylique polyéthoxylé, l'AKYPO® RO 90 VG, ayant la parti

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6

Bai, Bianfang. "In-situ FTIR-ATR studies on the adsorption mechanisms of collectors on mineral surfaces and their relationship to flotation." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430313.

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7

Manenzhe, Resoketswe. "Investigating the effect of water quality on the adsorption of a xanthate collector in the flotation of a sulphide ore." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29295.

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Environmental concerns necessitate the recycling of process water within mining operations. On average, recycled water contains more dissolved solids than fresh water. Since water is used as both a transportation and process medium, it is expected that changes in its quality will affect plant processes. Flotation is a process that is acutely sensitive to the immediate conditions of the system. Literature suggests that the efficiency of flotation separation is driven by the hydrophobicity that can be achieved by the mineral particles meant to be floated. The hydrophobicity is in turn driven by

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8

Teixeira, Raimundo Nonato Pereira. "Removal of Cu (II), Ni (II), Cd (II) and Pb (II) of wastewater of electroplating industry using hybrid system adsorption electro-flotation-coagulation." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13711.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>Bodies of water contamination problems have stimulated many researchers around the world in the search for alternatives to solve or minimize the effects caused by discharges of toxic materials to the environment. What is desired, preferably, is that such solutions are economically viable and efficient. Toxic metals on the list of the main contaminants of water bodies. Because these are very dangerous chemicals, this class of materials has led many research groups seeking to achieve avoid contamination of water bodies by

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9

Basilio, Cesar Indiongco. "Thermodynamics and electrochemistry of the chalcocite-potassium ethyl xanthate system." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/90909.

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Comprehensive thermodynamic calculations have been carried out on the chalcocite-KEX-water system based on complete mass balance equations which include both soluble and insoluble species. The calculations have yielded i) E<sub>h</sub>-pH stability diagrams for different KEX additions, ii) equilibrium concentrations and amounts of all the dissolved and insoluble species including those of CuX and CuX₂, iii) two- and three-dimensional plots showing the effect of E<sub>h</sub> and pH on the formation of selected species, and iv) minimum xanthate additions required to form CuX and CuX₂. These inf

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10

Pritzker, Mark David. "Thermodynamic and kinetic studies of galena in the presence and absence of potassium ethyl xanthate." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76476.

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A study of the electrochemistry of the PbS-H₂O and PbS-KEX-H₂O systems has been made by carrying out thermodynamic calculations, electrochemical experiments and microflotation tests. Particular attention has been paid to how well this system can be described by equilibrium thermodynamics. The thermodynamic calculations are more comprehensive than previous ones of this type since they are based on a mass balance which includes both insoluble and soluble species. The data they provide include equilibrium concentrations of all dissolved species at any E<sub>h</sub> and pH and an E<sub>h</sub>-p

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11

Montes, Sotomayor Sergio. "La flottation inverse des minerais de fer a gangue silicatée : mécanismes et effet de l'amidon de maïs." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL130N.

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La présente recherche vise à améliorer la flottation sélective de quartz et de l'hématite en présence des sels d'alkylammonium en absence et en présence d'amidon de maïs. L'étude des propriétés structurales, morphologiques et superficielles des adsorbants révèlent que le quartz est très pur par rapport à l'hématite et que tous les deux ont de faibles surfaces spécifiques. Les propriétés électrochimiques superficielles, responsables de la flottabilité des minéraux, ont été déterminées. Elles montrent la nature électrostatique de la liaison normale minéral-adsorbat. Dans le cas du quartz, l'adso

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12

Zhang, Ming. "Elimination de nanoparticules par des procédés de flottation." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0012/document.

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La séparation de nanoparticules (NPs) contenues dans des milieux aqueux est un sérieux challenge pour le traitement des eaux à cause de la grande stabilité et de la nature colloïdale de ces particules. Ce travail concerne le développement de procédés efficaces de flottation pour la séparation de nanoparticules. La première partie du travail est conduite pour obtenir une connaissance plus étroite de la nature et du comportement colloïdal des nanoparticules en suspension. Des tests de modifications de leur surface et des expériences d’adsorption-agrégation sont ensuite menés pour comprendre les

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13

Yang, Song. "Épuration de minéraux silicatés : talcs de la société Talc de Luzenac : mécanisme de la flottation différentielle chlorite-dolomite-quartz." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL056N.

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L’objectif est de rechercher les moyens de valorisation de rejets talqueux ou de mélange de talc et de chlorite contenant de la dolomite ou du quartz. L’hydrophobicité naturelle du talc permet d'obtenir par flottation des concentrés enrichis en talc. Les résidus de cette opération contenant du talc, de la chlorite, de la dolomite, et du quartz sont commercialisable si l'on est capable d'éliminer les carbonates et le quartz. Cette séparation a été étudiée sur des phases pures en tube Hallimond et en micro cellule EMDEE. La mesure des temps d'induction et les résultats sur phases pures ont permi

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14

Lafhaj, Zineb. "Augmentation du contraste de séparation des minéraux calciques semisolubles à l’aide de combinaisons de réactifs carboxyliques et non-ionique." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0052.

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La valorisation des minéraux calciques est un problème mondial. La flottation est une technique utilisée pour séparer ces minéraux puisqu’elle joue sur leurs propriétés superficielles. Cependant, c’est un défi scientifique important puisque les propriétés de surface des minéraux calciques sont très proches. Les difficultés de séparation de ces derniers sont donc dues, aux similitudes entre leurs propriétés chimiques de surface, mais aussi leurs propriétés électrocinétiques et leur stabilité en milieu aqueux. L’application des résultats de recherche fondamentale porte sur les minéraux purs dont

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15

Geneyton, Anthony. "Flottation des particules fines : application aux résidus miniers contenant des minéraux porteurs de terres rares." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0100.

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La flottation des particules fines est un challenge technique que l’industrie minière doit relever pour pouvoir exploiter de manière optimale certains types de gisement dont les minerais présentent des textures particulièrement fines. Cette problématique revêt une importance particulière avec la diminution des ressources minérales considérées comme conventionnelles du point de vue de la maille de libération des minéraux d’intérêt. Il existe deux manières d’optimiser les procédés de flottation pour un minerai, la recherche des paramètres de fonctionnement optimaux des équipements de flottation

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16

Rosa, Andrey Alexsandro. "Pré-cloração associada à adsorção em carvão ativado em pó e flotação por ar dissolvido na remoção de microcistina presente em três diferentes concentrações em águas provenientes de reservatório eutrofizado." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-11072008-154329/.

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O crescimento desordenado das cidades, a utilização de áreas para plantio próximas aos mananciais e o lançamento de águas residuárias domésticas e industriais sem tratamento são consideradas as principais fontes de poluição dos corpos d´água. Tal poluição contribui para o enriquecimento dos corpos hídricos em relação aos nutrientes. Isto, combinado com fatores climáticos proporciona condições para a ocorrência de florações de algas que podem apresentar espécies potencialmente tóxicas. Desta forma, aumenta a preocupação com desenvolvimento de técnicas de tratamento que forneçam água de qualidad

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17

Silva, André Luís Vieira da. "Remoção de microcistina de águas para abastecimento em sistema que associa unidades de adsorção por carvão ativado em pó e flotação por ar dissolvido em escala de laboratório." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-07102016-103812/.

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A crescente degradação da qualidade dos mananciais que servem os sistemas públicos de abastecimento de água potável faz com que se busquem novas técnicas para remoção de compostos indesejáveis. Os fatores climáticos que predominam no Brasil favorecem o desenvolvimento, em ambientes eutrofizados, de microrganismos conhecidos como cianobactérias que podem ser potencialmente produtores de toxinas. Este trabalho estudou a eficiência de remoção de microcistinas em um sistema que associa coagulação, floculação, flotação por ar dissolvido, adsorção em carvão ativado e filtração, com o intuito de remo

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18

Yildirim, Ismail. "Surface Free Energy Characterization of Powders." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/27525.

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Microcalorimetric measurements and contact angle measurements were conducted to study the surface chemistry of powdered minerals. The contact angle measurements were conducted on both flat and powdered talc samples, and the results were used to determine the surface free energy components using Van Oss-Chaudhury-Good (OCG) equation. It was found that the surface hydrophobicity of talc increases with decreasing particle size. At the same time, both the Lifshitz-van der Waals (gSLW) and the Lewis acid-base (gSAB) components (and, hence, the total surface free energy (gS)) decrease with decrea

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19

Lacerda, Junior Jonatas Araujo de. "Projeto, constru??o e an?lise de um prototipo vibracional em escala de bancada aplic?vel ao tratamento de ?gua de produ??o de petr?leo bruto, mediante inovadora opera??o h?brida de adsor??o e auto-flota??o." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/13037.

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Made available in DSpace on 2014-12-17T14:09:19Z (GMT). No. of bitstreams: 1 JonatasALJ_TESE.pdf: 9049452 bytes, checksum: dd9b668c8bc7791108be8a6bbc44e152 (MD5) Previous issue date: 2014-04-28<br>A self-flotator vibrational prototype electromechanical drive for treatment of oil and water emulsion or like emulsion is presented and evaluated. Oil production and refining to obtain derivatives is carried out under arrangements technically referred to as on-shore and off-shore, ie, on the continent and in the sea. In Brazil 80 % of the petroleum production is taken at sea and area of deployment

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20

Chen, Ze Huai. "The synthesis of naphthalene derivatives and their adsorption at the grahite-water interface." 1994. http://arrow.unisa.edu.au:8081/1959.8/83889.

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21

Mwapwele, Collins William. "Effect of flotation reagents on the adsorption of gold by activated carbon." Thesis, 2016. http://hdl.handle.net/10539/20058.

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The use of activated carbon in gold extraction is one of the most established methods for the recovery of gold from a leach solution. This is due to its lower operational cost and its ability to produce gold bullion with good purity compared to other methods such as cementation. Flotation of sulphide gold ores is commonly used as one of the beneficiation processes before leaching. However, the type and dosage of flotation reagents can affect downstream processes due to their fouling effect on granular activated carbon. This study aims to investigate the fouling effect of the most widely used f

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22

Mulaudzi, Masilu Godfrey. "Computer simulation studies of thiol collectors adsorption on sulphide mineral, for flotation process." Thesis, 2020. http://hdl.handle.net/10386/3386.

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Thesis(Ph.D.(Physics)) -- University of Limpopo, 2020<br>Surface properties of pyrite (FeS2), chalcopyrite (CuFeS2), galena (PbS) and sphalerite (ZnS) most thermodynamically stable surfaces have been studied using first priniciples density functional theory. The most stable surfaces showed the highest surface exposure as it covered a higher percentage of the surface area on morphologies. The interaction of water with such sulphide surfaces was also investigated; the structures of sulphide minerals surfaces were changed in the presence H2O molecules. The surfaces of FeS2 and ZnS rel

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23

Huang, Shu Zhen, and 黃淑禎. "Colloid adsorption flotation of cobalt(II) ions and SPME of haloethers in water." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/01493295637341021473.

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24

Huang, Shu-Zhen, and 黃淑禎. "Colloid adsorption flotation of cobalt(II) ions and SPME of haloethers in water." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/65516003620122180459.

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25

Tsai, Tzung Ying, and 蔡宗穎. "Colloid adsorption flotation of mixed heavy metal ions(Cu,Zn,Pb Ni) and Uranine." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/13923736631596224751.

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26

Jaji, Kehinde Temitope. "Treatment of Oilfield Produced Water with Dissolved Air Flotation." 2012. http://hdl.handle.net/10222/15347.

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Produced water is one of the major by products of oil and gas exploitation which is produced in large amounts up to 80% of the waste stream. Oil and grease concentration in produced water is the key parameter that is used for compliance monitoring, because it is easy to measure. For Canadian offshore operations, the current standard is a 30-day volume weighted average oil-in-water concentration in discharged produced water not exceeding 30 mg/L. Treatment of produced water may therefore be required in order to meet pre-disposal regulatory limits. The measurement of oil in produced water is imp

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27

Barnes, Deon Eugene. "Die adsorpsie van natriumlinoleaat op verdunningsminerale in foskoriet en pirokseniet." Thesis, 2014. http://hdl.handle.net/10210/10871.

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28

Cushing, Alexander. "ADSORPTION OF POLYAMINE CHELATED COPPER IONS ONTO GANGUE MINERALS AND HIGH CAPACITY ADSORBENTS." Thesis, 2013. http://hdl.handle.net/1974/8546.

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The effluent quality from mining & processing operations is monitored to ensure that maximum allowable limits are not exceeded. Recently, copper concentration levels in the effluent discharge flows of a copper and nickel mining company in Ontario have indicated increasing trends. A chemical particular to the problem is use of diethylenetriamine (DETA) in the process. Adsorption tests were conducted to investigate the ability of various adsorbents to remove and retain copper complexed with DETA and triethylenetetramine (TETA) in solutions. The tests were divided into two sections: gangue adsorb

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29

Nyamekye, George A. "Adsorption of dextrin onto sulphide minerals and its effect on the differential flotation of the Inco matte." Thesis, 1993. http://hdl.handle.net/2429/2242.

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The major constituents of the Inco matte, chalcocite (Cu2S) and heazlewoodite (Ni3S2), are separated by differential flotation with diphenylguanidine as collector. To select an effective organic depressant, many dextrins were tested and tapioca dextrin 12 was found to have an exceptional affinity towards heazlewoodite surface at a particular pH of the mineral suspension. A new reagent system, involving the use of this dextrin as a modifying agent which provides better selectivity, has been studied. Adsorption tests revealed that while dextrin exhibits high affinity towards heazlewoodite, espec

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30

駱建樹. "Removal of Copper from Aqueous Amminecopper(II)Solution by Precipitation, Adsorption with Metal Hydroxide and Foam Flotation, and Removal of Cadmium and Nickel in Solution of High Ionic Strength by Coflotation with Ferrous Hydroxide." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/43723912001179054530.

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