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Dissertations / Theses on the topic 'Zinc leaching'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

McGinnity, Justin. "Sulfur dioxide leaching of zinc sulfide." Thesis, Curtin University, 2001. http://hdl.handle.net/20.500.11937/1033.

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Studies were conducted into the mechanism and kinetics of the dissolution of synthetic zinc sulfide and zinc concentrate in aqueous solutions containing sulfur dioxide.Experiments at ambient temperature established that the dissolution of ZnS in aqueous solutions of sulfur dioxide proceeds via acidic non-oxidative dissolution and not by direct reaction of the sulfide with S02(aq). The non-oxidative dissolution reaction generates H2S(aq) or HS-(aq) species which are thought to rapidly react with sulfurous acid species, S02(aq) or HS03-(aq), to possibly produce initially sulfane monosulfonates a

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2

McGinnity, Justin. "Sulfur dioxide leaching of zinc sulfide." Curtin University of Technology, Department of Applied Chemistry, 2001. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=12896.

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Studies were conducted into the mechanism and kinetics of the dissolution of synthetic zinc sulfide and zinc concentrate in aqueous solutions containing sulfur dioxide.Experiments at ambient temperature established that the dissolution of ZnS in aqueous solutions of sulfur dioxide proceeds via acidic non-oxidative dissolution and not by direct reaction of the sulfide with S02(aq). The non-oxidative dissolution reaction generates H2S(aq) or HS-(aq) species which are thought to rapidly react with sulfurous acid species, S02(aq) or HS03-(aq), to possibly produce initially sulfane monosulfonates a

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3

Dyson, Devy Alexander William. "Modeling the kinetics of the zinc pressure leaching process - oxidative sphalerite leaching in sulphuric acid media." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63409.

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In the field of hydrometallurgy, the industrial uptake of leaching models has been overlooked partially due to the lack of universal models. A model developed for one plant cannot easily be transferred for the application of a different plant without redesigning the leaching kinetics in the code. The Multiple Convolution Integral (MCI)-based model developed in this thesis has the ability to be universally applied by user-controlled inputs. Chemical reactions can be selected while the modeling software calculates the mass and energy balances. Residence times, operating conditions, and the rate-

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4

Chieng, Pau. "Recovery of silver from lead/zinc flotation tailings by thiosulfate leaching /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19152.pdf.

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5

Filippou, Dimitrios. "Reaction kinetics and reactor modelling of zinc-ferrite hot-acid leaching." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41588.

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The main objectives of this Thesis were the determination of the reaction kinetics of the dissolution of zinc-ferrite particles ((Zn$ sb{1-x}$, Fe$ sbsp{x}{2+}$)$ rm Fe sbsp{2}{3+}O sb4$, x $ le$ 0.4) in hot aqueous solutions of sulphuric acid, and the development of a mathematical model for the prediction of the performance of a series of continuous stirred-tank reactors where zinc ferrite is leached.<br>Well-characterised, porous zinc-ferrite particles of industrial origin were subjected to controlled leaching experiments at temperatures close to 373 K in sulphuric acid solutions of concentr

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6

Rusen, Aydin. "Recovery Of Zinc And Lead From Cinkur Leach Residues By Using Hydrometallurgical Techniques." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608669/index.pdf.

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In this thesis, it was aimed to select and propose a feasible method, or series of methods, for the recovery of zinc (Zn) and lead (Pb) that are present in disposed &Ccedil<br>iNKUR leach residues having 12.43 % Zn, 15.51 % Pb and 6.27 % Fe. Initially, physical, chemical and mineralogical characterizations of the leach residues were done. Results of these analyses showed that lead was present as lead sulfate (PbSO4), and zinc was present as zinc sulfate heptahydrate (ZnSO4.7H2O), zinc ferrite (ZnFe2O4) and zinc silicate (2ZnO.SiO2) in the leach residues. Initially, water leaching experiments w

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7

Deveci, Haci. "Bacterial leaching of complex zinc/lead sulphides using mesophilic and thermophilic bacteria." Thesis, University of Exeter, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341175.

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8

Bertilsson, Olle. "Study of leaching behavior of tin in Zinc-clinker and Mixed Oxide." Thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69941.

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Due to the increasing usage of Sn in different electronics, such as solders and in touchscreens, together with Boliden Rönnskärs increased intake of electronic waste as a secondaryraw material, a Zn-containing product called Zn-clinker has increasing amounts of Sn. TheZn-clinker is shipped to Boliden Zn-smelter in Odda, where the Zn-clinker is mixed in withcalcine (roasted concentrate) and leached in several steps. Since Zn-clinker is a product froma halogen removal in a clinker-furnace, the feed material (Mixed Oxide), for this furnace, wasalso investigated since there are plans to replace cl

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9

Zanager, Afaf Mohamed. "Mercury leaching from dental amalgam fillings and its association with urinary zinc." University of the Western Cape, 2019. http://hdl.handle.net/11394/6791.

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Magister Scientiae (Medical Bioscience) - MSc(MBS)<br>Mercury (Hg) is an example of a toxic metal that is not essential for nutrition. It exists in organic and inorganic forms in seafood and vapour from dental amalgam fillings respectively. Elemental mercury (Hg0) from dental amalgam was the focus of this study. Dental amalgam is one of the most commonly used dental filling materials and has been used for over 150 years. It is composed of Hg0 (approximately 50%) combined with other metals such as copper and zinc (Zn). These fillings give off Hg0 vapour throughout their existence, and is furthe

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10

Carrillo-Gonzalez, Rogelio. "Mechanisms of Zn displacement through sandy soils." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312559.

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11

Lu, Xiuqing, and 卢秀清. "Phase transformations and leaching behavior of hazardous zinc stabilized in aluminum-based ceramic products." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2015. http://hdl.handle.net/10722/212624.

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12

Torani, Daiane. "Sistemas alternativos de ativadores de vulcanização em comparação ao sistema tradicionalmente utilizado em compostos elastoméricos de borracha natural." reponame:Repositório Institucional da UCS, 2017. https://repositorio.ucs.br/handle/11338/3381.

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Submitted by Ana Guimarães Pereira (agpereir@ucs.br) on 2017-12-14T11:27:43Z No. of bitstreams: 1 Dissertacao Daiane Torani.pdf: 659387 bytes, checksum: 1da8ec4adced63030a1d1600bee76d99 (MD5)<br>Made available in DSpace on 2017-12-14T11:27:43Z (GMT). No. of bitstreams: 1 Dissertacao Daiane Torani.pdf: 659387 bytes, checksum: 1da8ec4adced63030a1d1600bee76d99 (MD5) Previous issue date: 2017-12-14<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, CAPES.

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13

Dikko, Abubakar Umar. "An evaluation of some procedures for assessing the long-term capacity of soil minerals to replenish nutrients lost and the effects of acid deposition." Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362251.

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A novel system for leaching of reconstituted cores of soils taken from horizons of <I>Calluna</I> moorland podzol profiles derived from granites has been used to see if absolute, or at least, relative, weathering rates assessed by simple leaching techniques and by using the PROFILE model agreed. Initial base cations are first removed by leaching with ammonium acetate. Agreement was reasonable, but the results highlighted problems posed by mineralization effects in column-based procedures. A successful attempt was made to develop a procedure to overcome this problem, based upon pre-oxidation wi

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14

Moura, André Negrão de. "Remediação de áreas contaminadas com metais pesados utilizando Acidithiobacillus sp." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3147/tde-15032007-113057/.

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A \"Região dos Lagos\" de Santa Gertrudes é um exemplo das muitas áreas contaminadas com metais pesados existentes no Estado de São Paulo e no Brasil. O pólo de Revestimentos Cerâmicos de Santa Gertrudes dispôs inadequadamente seus resíduos sólidos e águas residuárias diretamente no solo por mais de três décadas, contaminando uma área de 1,5 km2. A despeito das incertezas que cercam e que prejudicam a plena compreensão de um processo de bioremediação de um solo contaminado, esta pesquisa avalia a influência do pH inicial e da adição de inoculo e nutrientes sobre a eficiência de remoção de chum

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15

Saba, Mojtaba. "The Extraction Behaviour of Zinc, Lead and Silver from Ores and Concentrates by Glycine Leaching Processes." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/81907.

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This research covers the fundamental aspects of the direct leaching of sphalerite by considering the dissolution of silver, lead, and copper contents and their effects on the process. The effects of independence variables such as sodium hydroxide, potassium permanganate, hydrogen peroxide, lead nitrate, sodium chloride, dissolved oxygen, temperature, glycine concentration, dissolution time, and particle size on the process were investigated. All the outputs have been modelled and optimised through the analysis of variance.

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16

MOSTONI, SILVIA. "From nanosized to single sites zinc-based activators for rubber vulcanization process." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241069.

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I nanocompositi di gomma (NC) sono materiali comunemente usati nell’industria degli pneumatici. Le proprietà meccaniche dipendono sia dall’aggiunta delle nanoparticelle (NP) di filler rinforzanti e dal processo di vulcanizzazione. La reazione di vulcanizzazione a base zolfo si basa sulla formazione di un reticolo chimico tra le catene di polimero attraverso ponti mono-, bi- e poli-sulfurei. L’incremento della velocità di reazione e dell’efficienza di reticolazione è consentito da un complesso sistema catalitico, composto da acceleranti (ad esempio sulfenammidi), attivatori (ossidi metallici) e

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17

Sunkar, Ahmet Semih. "Investigation And Development Of Possible Leaching Processes For Recovery Of Zinc And Lead From Cinkur Leach Residues." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605886/index.pdf.

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The major aim of this study was to investigate various leaching methods for the recovery of zinc and lead from blended neutral leach residues of &Ccedil<br>inkur having a composition of 12.59 % Zn, 15.21 % Pb, 6.45 % Fe, 0.054 % Cd. Initially water leaching tests were performed at various conditions of leaching temperature, reaction time and particle size. The optimized conditions for water leaching were found to be 2 h, 95&amp<br>#61616<br>C and 250 g/l pulp density with a final pH of 5.9. However, the zinc recovery value of 10.26 % was not adequate for industrial scale operations itself.

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18

Wagner, Manuela. "Industrial Pilot Scale Leaching and Recovery of Zinc from Waste-to-Energy Fly Ash using Scrubber Liquids." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10348.

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Previous studies from laboratory experiments and a similar process at a plant in Switzerland, led to the pilot plant project at Renova AB, which will be described in this master thesis. In cooperation with Götaverken Miljö AB it was investigated if fly ash, produced at the Renova Waste-to-Energy plant in Gothenburg, could be treated with own scrubber liquids in order to recover zinc. If successful, Renova might build this tested pilot process in to a big scale. The pilot plant has a scale of 16 times smaller than a future big scale process. The goal of the project is to leach zinc from fly ash

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19

Sunkar, Ahmet Semih Supervisor :. Topkaya Yavuz A. "Investigation and development of possible leaching processes for recovery of zinc and lead from çinkur leach residues." Ankara : METU, 2005. http://etd.lib.metu.edu.tr/upload/12605886/index.pdf.

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20

Cartwright, John Alexander. "Study of the leaching of polymetallic sulphide ores using ion selective membranes." Thesis, Queensland University of Technology, 1998.

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21

Mocellin, Julien. "Ressources secondaires de métaux, valorisation par voie hydrométallurgique de résidus de sidérurgie pour la valeur en zinc, en manganèse et plomb." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0211/document.

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Entre le milieu du XIXème et du XXème siècle, le secteur sidérurgique a été l’une des principales sources de richesse en France. Toutefois, la production de ferromanganèse a généré une quantité considérable de déchets, notamment lors du lavage des fumées des hauts fourneaux. Ces boues d’épuration, riches en zinc (Zn), manganèse (Mn) et plomb (Pb) (5 à 40% en masse), ont été déposées dans des bassins de décantation en périphérie des sites sidérurgiques. Depuis la fermeture des usines, ces terrains sont restés en l’état et certains, comme à Pompey (Lorraine), ont été progressivement colonisés pa

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22

Gazano, Vanessa Santos Oliveira. "Contaminação de solos por metais tóxicos provenientes do descarte inadequado de pilhas Zinco-Carbono de uso doméstico." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-15052012-140600/.

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O presente trabalho determinou a concentração dos metais zinco, manganês, cádmio, chumbo, níquel, cobre e cromo no efluente e solo de quatro colunas de latossolo indeformadas. Duas colunas foram contaminadas por pilhas do tipo zinco-carbono e duas colunas foram utilizadas como referência, além de pilhas isoladas, foram todas lixiviadas por uma solução \"água de chuva\" (HNO3 + H2SO4, pH 4,0). Os metais no efluente e no solo foram determinados pela técnica de ICP-OES. A avaliação do efluente e do solo das colunas contaminadas pelas pilhas mostrou um incremento das concentrações dos metais, prin

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23

Ngenda, Banka Richard. "Etude de valorisation des rejets des usines à zinc de Kolwezi, République démocratique du Congo." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210144.

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Les rejets des Usines à Zinc de Kolwezi contiennent majoritairement du zinc sous forme réfractaire (ferrite) au traitement hydrométallurgique conventionnel. Ils contiennent d’autres métaux « lourds » qui les rendent dangereux vis-à-vis de l’environnement dans lequel ils sont actuellement entreposés. Ces métaux, dont la plupart peuvent être valorisés, font de ces rejets un véritable gisement secondaire. Il est donc impératif de mettre au point un procédé adéquat de valorisation ;d’où le thème de la présente thèse :« Etude de valorisation des rejets des Usines à Zinc de Kolwezi, RDC ». <p>A l’ai

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24

Tshibanda, Kabumana Dieudonne. "Contribution à la recherche d'un modèle de gestion d'un passif envronnemental issu d'un traitement métallurgique des minerais sulfurés cuivre zinc en République Démocratique du Congo." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209618.

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Ce travail traite d’un problème de pollution liée à la présence de métaux de base dans des passifs environnementaux issus d’un traitement métallurgique des minerais sulfureux cuivre – zinc provenant de la mine de Kipushi en République Démocratique du Congo. L’objectif principal de ce travail a été d’arriver à proposer des scénarios de gestion durable au passif environnemental de la filière présentant les risques environnementaux les plus élevés. Pour cela, on a d’abord procédé à une identification des différents problèmes environnementaux tout au long de la filière de traitement sur les quatre

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25

Tchoumou, Martin. "Hydrometallurgie du cuivre en milieu chlorure : attaques de minerais dosages polarographiques des solutions resultant de l'attaque et depot cathodique du cuivre." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13154.

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Etude dans le cadre de l'extraction de cu des minerais de type chalcopyrite. Lors de l'attaque des minerais de type chalcopyrite par des solutions de cu(ii) en milieu fortement chlorure, les metaux presents dans le minerai sous forme de sulfures passent en solution soit partiellement soit en totalite, et s elementaire precipite. Mise au point du dosage polarographique des ions cu, pb, zn et fe dissous. L'electrolyse de solutions a teneur elevee en cu(i) et contenant pb(ii), zn(ii) ou fe(ii) a mis en evidence un phenomene de codeposition de pb avec cu lorsqu'on opere a des densites de courant e

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26

Obeng, Daniel Philip. "Leaching in reactive froth of zinc sulphide concentrate." Thesis, 1997. https://hdl.handle.net/10539/27822.

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A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the Degree of Master of Science in Engineering.<br>Laboratory experimentation were conducted to investigate the regeneration and recycling of nitric acid during leaching in froth (LIF) processing of Gamsberg zinc sulphide concentrate. Two experiments were performed in a mechanically stirred batch reactor at 80- 90°C to determine the leaching kinetics of the zinc sulphide concentrate. 93 to 97% of zinc was extracted into spent zinc sulphate electrol

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27

Kasongo, Katambayi. "Alkine pre-treatment of jarosite minerals when leaching gold and silver from zinc refinery residue." Thesis, 2008. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000580.

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Thesis (MTech. degree in Metallurgic Engineering)--Tshwane University of Technology, 2008.<br>The purpose of this study is to develop a feasible process for extracting gold and silver from an electrolytic zinc refinery residue. Composite samples of electrolytic zinc refining lead-silver residues containing traces of gold (1.35 g/t) and significant amounts of silver (155 g/t) were subjected to batchwise cyanide leaching to assess the feasibility of extracting gold and silver. This project was concluded with a recommendation that a pilot Residue Leach Plant should be commissioned to beneficiate

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28

Jun-HaoHuang and 黃俊豪. "The filtration behavior of crude zinc oxide after sulphuric acid leaching." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/95503624740207880553.

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碩士<br>國立成功大學<br>資源工程學系碩博士班<br>100<br>Crude zinc oxide is the product of the Waelz kiln process for the processing of EAF dust. With increasing amount of EAF dust produced in Taiwan, many company jump into the production and sale of crude zinc oxide to downstream firms for manufacturing of zinc oxide. Crude zinc oxide is a valuable resource with high zinc content (〉40%). it also contains other valuable metals such as lead and iron. Usually the zinc in crude zinc oxide was recovered by sulphuric acid leaching and filtration. However, the filterability of leachate produced by sulphuric acid leac

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29

Chen, Tsung-Mao, and 陳宗懋. "Recovery of Zinc from Electric Arc Furnace Flue Dust by Alkaline Leaching." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/13144016470749520571.

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碩士<br>國立屏東科技大學<br>環境工程與科學系所<br>97<br>The electric arc furnace steel-making process generate a large amount of waste known as electric arc furnace flue dust. The current treatment is still limited to pyrometallurgical smelter to recover zinc oxide while dump the residues of other heavy metals oxide directly to landfill which already cause a serious threat to the environment. Due to the surging raw materials prices and shortage of mineral resources for Taiwan, how to effectively recover almost all metals would be an important issue to be addressed. The hydrometallurgical techniques could be the

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30

Morin, Kevin A. (Kevin Andrew) 1955, Nora M. Hutt, and Keith D. 1952 Ferguson. "Measured rates of copper and zinc leaching in the International Kinetic Database." 1995. http://hdl.handle.net/2429/10854.

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The objective of the International Kinetic Database (IKD) is to characterize bulk reaction rates in alkaline, neutral, and acidic minesite drainage. The IKD currently contains 307 kinetic tests from around the world, and is growing. Of the 307 tests, 185 provided leaching rates for copper and zinc. Scatterplots of these rates against pre-test parameters such as solid-phase copper and acid-base accounting failed to reveal any clear relationships. Consequently, leaching rates cannot be predicted accurately from pre-test characterization of a sample. Some correlation was noted among leaching

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31

Strobos, Johannes Gerhardus. "Zinc recovery from baghouse dust generated at Ferrochrome foundries." Diss., 2002. http://hdl.handle.net/2263/29153.

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During the production of ferrochrome in electric arc furnaces, a dust is captured in baghouse filters as a means of air pollution control. This dust contains various metals such as chromium, zinc, iron, aluminium and magnesium. Due to the presence of hexavalent chromium in the dust, which is both toxic and carcinogenic, it requires disposal at a hazardous waste disposal site, entailing high cost. The possibility exists that these costs could be reduced if metals such as zinc can be recovered from the dust through, inter alia, leaching. Experiments were performed to determine suitable condition

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32

Tzu-YingTsao and 曹姿盈. "The filitability improvement of anglesite–sludge produced by sulphate acid leaching of crude zinc oxide." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/62291041446196670101.

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33

Beard, Jason. "A study of leaching tests for cement stabilised waste." Thesis, 2002. https://vuir.vu.edu.au/15565/.

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A cement-stabilised waste was subjected to batch, column, and dynamic leaching tests, and the leaching behaviour of arsenic, copper, lead, selenium, and zinc was investigated. Batch tests included the Australian Bottle Leaching Procedure (ABLP, AS 4493.3-1997), Toxicity Characteristic Leaching Procedure (TCLP, USEPA Method 1310); column testing included small columns (internal diameter = 24mm) and a large column (internal diameter = 500mm); and dynamic leaching tests were run with both short (1 hour) and long (4 hour) leachant renewal frequencies. A maximum availability test was used to indi

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34

Owusu, George. "The role of surfactants in the leaching of zinc sulphide minerals at temperatures above the melting point of sulphur." Thesis, 1993. http://hdl.handle.net/2429/2204.

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The role of the surfactants lignin sulfonic acid, cocoamido hydroxyl sulfobetaine (CAHSB), tallow amido hydroxyl sulfobetaine (TAHSB), cocoamido betaine (CAB), naphthalene sulfonic acid-formaldehyde condensates and orthophenylene diamine (OPD) in the liquid sulfur-aqueous zinc sulphate-zinc sulfide mineral system has been studied. The effect of the various surfactants on the liquid sulfur-aqueous system interfacial tensions and the liquid sulfur-mineral contact angle were measured in a high temperature-high pres-sure apparatus. In the absence of any surfactant, the liquid-liquid interfacial te

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35

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

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

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37

Schuwirth, Nele [Verfasser]. "The release of zinc and lead from mine tailings : evaluation of leaching tests, soil water sampling, and sequential chemical extractions with special focus on sphalerite bearing flotation residues with anoxic conditions / vorgelegt von Nele Schuwirth." 2006. http://d-nb.info/980855470/34.

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38

Берстенев, Н. В., та N. V. Berstenev. "Исследование комбинированной технологии переработки медно-цинковых промпродуктов : магистерская диссертация". Master's thesis, 2016. http://hdl.handle.net/10995/43703.

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В представленной работе на тему «Исследование комбинированной технологии переработки медно-цинковых промпродуктов» произведены теоретические и лабораторные исследования по определению оптимальной технологии переработки медно-цинковых сульфидных промпродуктов гидрометаллургическим способом. Рассмотрены две эффективные технологии, проведено сравнение по объективным показателям, сделаны экологоэкономический и экономический расчеты.<br>In this study, entitled "Study of the combined technologies of processing of copper-zinc middlings" produced theoretical and laboratory studies to determine the bes

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