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Dissertations / Theses on the topic 'Leaching'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Ekström, Tomas. "Leaching of concrete : the leaching process and its effects /." Lund : Univ, 2003. http://www.byggnadsmaterial.lth.se/.

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2

Barbosa, Filho Olavo. "Thiocyanate leaching of gold." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46663.

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3

Trejo-Gallardo, Jaime. "Modeling chalcopyrite leaching kinetics." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/240.

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Chalcopyrite (CuFeS2) is the most abundant of the copper sulfides and also one of the most refractory for leaching. Several processing routes have been proposed to overcome drawbacks associated with environmental problems related to copper extraction from this mineral. Atmospheric leaching in acidic ferric sulfate is regarded as being particularly attractive over other hydrometallurgical systems. However, the challenge has been to overcome the problem of slow extraction rates due to passivity encountered at high solution potentials in this system. This highlights the need to investigate better

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4

Munkondya, Ferguson Mukozoke. "Kinetic modelling of leaching." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47583.

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5

Sililo, Bernard Liswani. "Modelling uranium leaching kinetics." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/61336.

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The uranium price decline has negatively impacted on the uranium mining industry. This decline in price requires that uranium metallurgical processes be made to operate more efficiently. Some key parameters that influence the dissolution and kinetics of leaching uraninite (one of the main minerals from which uranium can be extracted) are pH, oxidationreduction potential and iron concentration. A good understanding of the effect these parameters have on the leach kinetics would lead to an efficient operation of metallurgical processes. The objective of this work was therefore to investiga

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6

Watson, Jack. "Leaching for Maintenance: Factors to Consider for Determining the Leaching Requirement for Crops (AZ." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/146964.

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3 pp.<br>As a result of the application of irrigation water containing soluble salts, a salt load is continually added to the soil. Soil salts have to be removed on an ongoing basis through maintenance leaching to prevent yield losses from a salinity buildup. This publication provides factors to consider for determining the leaching requirement for crops.

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7

Tavakolikhaledi, Mohammadreza. "Vanadium : leaching and solvent extraction." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46814.

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The fundamental understanding of vanadium hydrometallurgy was developed in three phases: vanadium (V) leaching, vanadium (III) oxidative leaching, and solvent extraction of vanadium (V&IV). In the first section, V₂O₅ leaching was studied in three steps. First, vanadium leaching and solubility of VO₂⁺ at different pH’s and temperatures were investigated in sulfuric acid. Secondly, the kinetics of vanadium leaching in pH 5 and pH 8 solutions, and the reductive leaching of vanadium pentoxide using sodium sulfite were studied. It was shown that the kinetics of acid leaching is rapid but suffers f

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8

Hill, Annette Rosemary. "Leaching of alternative pavement materials." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410354.

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9

Dubus, Igor G. "Calibration of pesticide leaching models." Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269528.

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10

May, Noelene. "The ferric leaching of pyrite." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/17952.

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Bibliography: pages 82-90.<br>The bioleaching of pyrite has been found to occur via an indirect mechanism. Ferric iron leaches the pyrite, and is reduced to ferrous iron. Bacteria such as Thiobacillus ferrooxidans oxidise the ferrous iron to ferric iron, thus maintaining a high redox potential. In this thesis, the effect of the redox potential on the ferric leach rate was investigated by examining previously published data and by developing an experimental technique where dynamic redox potential measurements were used to study the kinetics of the sub-process. The ferric leach rate of pyrite wa

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11

Albertani, Bryce Martin. "The leaching of α-spodumene". Thesis, Albertani, Bryce Martin (2018) The leaching of α-spodumene. Honours thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/44868/.

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An investigation into the direct leaching of α-spodumene has being warranted due to increasing societal interest in lithium-ion battery technology. The direct leaching of α-spodumene utilising a caustic autoclave process was investigated, in aspirations of leaching significant quantities of lithium from the silicate matrix of α-spodumene. The influence of reagent dosage, temperature, reaction time and particle size on the extraction efficiency of lithium were investigated. From the investigations conducted it became evident that the leaching efficiency of α-spodumene was consistently greater t

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12

Parker, Gretel Kristen. "Spectroelectrochemical investigation of chalcopyrite leaching." Thesis, Griffith University, 2006. http://hdl.handle.net/10072/365971.

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This thesis describes an experimental investigation, utilising primarily spectroelectrochemical techniques, into the mechanism of chalcopyrite leaching and the properties of the metal-deficient product layer. A systematic comparison of the leaching behaviour and products in chloride and sulfate lixiviants was undertaken, and variation of leach conditions was also considered. The product layer distribution, structure and morphology was examined, and various model systems and compounds investigated to aid in identifying the product layer composition and properties. A range of chalcopyrites, a

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13

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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14

Marshall, Miles Ramsvik. "Spatial variablity and pesticide leaching : measurement and modelling the hydrodynamic aspects of pesticide leaching in soils." Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402812.

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15

Gashier, Wail. "Accelerated leaching methods for cementitious nuclear wasteforms and the impact of superplasticisers on the leaching behaviour." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12266/.

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The Intermediate Level Wastes (ILW), produced during the reprocessing of spent nuclear fuel, are commonly encapsulated in a blast furnace slag (BFS) and Portland cement (PC) composite and stored in repositories. These cements are required to safely immobilise these wastes for long durations of time. Additives are used in the cementitious wastes to further enhance them for example superplasticisers are used in general cement industry to increase fluidity, resulting in large reductions of water required for mixing, giving high early strength development, a decrease in permeability and ultimately

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16

Garlapalli, Ravinder Kumar. "Leaching of chalcopyrite with sodium hypochlorite." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/11213.

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Thesis (M.S.)--West Virginia University, 2010.<br>Title from document title page. Document formatted into pages; contains vii, 47 p. : ill. Includes abstract. Includes bibliographical references (p. 46-47).

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17

Lázaro-Báez, María Isabel. "Electrochemistry of the leaching of chalcopyrite." Murdoch University, 2001. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20060817.125248.

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The potential region in which chalcopyrite dissolves during the oxidative leaching of the mineral in ferric sulphate solutions has been established. These results have been modelled using an extended mixed-potential description of the system. The initial stages of the dissolution process have been studied using a chalcopyrite disk and a platinum ring electrode held at appropriate potentials for the detection of ferrous and cupric ions. These experiments have shown that the initial stages of oxidation of the mineral involve the formation of soluble sulphur species in addition to elemental sulph

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18

Xia, Chen. "Thiosulphate stability in gold leaching process." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ59414.pdf.

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19

Lázaro-Báez, María Isabel. "Electrochemistry of the leaching of chalcopyrite /." Access via Murdoch University Digital Theses Project, 2001. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20060817.125248.

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20

Ndlovu, Sehliselo. "Bacterial leaching of pyrite single crystals." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401694.

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21

Andac, M. "Leaching of cement-stabilised solid waste." Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.592062.

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The physical, chemical and leaching properties of municipal solid waste incinerator (abbreviated MSWI) fly ash itself and the long term leaching properties and leaching mechanisms of stabilised MSWI-fly ash in cement systems were analysed. MSWI-fly ash is a complex material which consists of crystalline phases including NaCl, KCl, CaSO<SUB>4</SUB>, SiO<SUB>2</SUB>, glassy silicates and also an amorphous organic phase. The MSWI-fly ash has a relatively high content of toxic metals, mainly Zn and Pb. The leaching properties of these elements from the ash depends on leachate pH as well as the lea

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22

Al-Omeiri, Saeed S. "Leaching of copper-refined anode slime." Thesis, University of Strathclyde, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435125.

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23

Cai, Liping. "CFD modelling of chalcopyrite heap leaching." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/44559.

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Heap leaching is widely applied to recover metals from ore. The behaviour of the fluid and chemical species inside heaps, which involves many coupled physico-chemical phenomena, are highly variable and complex. Computational Fluid Dynamics (CFD) simulation can provide an efficient approach to investigate these phenomena and offer guidelines to improve heap design. Stagnant zones exist in the packed bed with multiphase flow, however, the conventional advection-dispersion model (ADE) failed to capture this phenomenon, therefore, the mobile immobile model (MIM) is employed to model the mass trans

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24

Carter, E. Thomas Jr. "Risk assessment formulation for nitrate leaching." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/40347.

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25

Dominguez, Kimberly. "Leaching of Silver Nanoparticles from Textiles." Ohio University Art and Sciences Honors Theses / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors155690445799457.

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26

Abrahamsson, Filip. "Leaching of Pyrrhotite from Nickel Concentrate." Thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-64934.

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Non-oxidative acid leaching of pyrrhotite from Kevitsa’s Ni-concentrate and methods to recover by-products, have been investigated. Selective dissolution of pyrrhotite (Fe1-xS, 0<x<0.25) can enrich the content of the valuable metals, such as Ni and Co, in the final concentrate and will reduce the amount of Fe and S sent to the smelters. The pyrometallurgical smelting of leached concentrate will thus give less formation of smelter by-products in form of slag and SO2. The leaching was studied through an experimental design plan with parameter settings of 38.8% to 57.8% H2SO4 and temperatu

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27

Carter, E. Thomas. "Risk assessment formulation for nitrate leaching /." This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11182008-063039/.

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28

Lazaro-Baez, Maria Isabel. "Electrochemistry of the leaching of chalcopyrite." Thesis, Lazaro-Baez, Maria Isabel (2001) Electrochemistry of the leaching of chalcopyrite. PhD thesis, Murdoch University, 2001. https://researchrepository.murdoch.edu.au/id/eprint/147/.

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The potential region in which chalcopyrite dissolves during the oxidative leaching of the mineral in ferric sulphate solutions has been established. These results have been modelled using an extended mixed-potential description of the system. The initial stages of the dissolution process have been studied using a chalcopyrite disk and a platinum ring electrode held at appropriate potentials for the detection of ferrous and cupric ions. These experiments have shown that the initial stages of oxidation of the mineral involve the formation of soluble sulphur species in addition to elemental sulph

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29

Lazaro-Baez, Maria Isabel. "Electrochemistry of the leaching of chalcopyrite." Lazaro-Baez, Maria Isabel (2001) Electrochemistry of the leaching of chalcopyrite. PhD thesis, Murdoch University, 2001. http://researchrepository.murdoch.edu.au/147/.

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The potential region in which chalcopyrite dissolves during the oxidative leaching of the mineral in ferric sulphate solutions has been established. These results have been modelled using an extended mixed-potential description of the system. The initial stages of the dissolution process have been studied using a chalcopyrite disk and a platinum ring electrode held at appropriate potentials for the detection of ferrous and cupric ions. These experiments have shown that the initial stages of oxidation of the mineral involve the formation of soluble sulphur species in addition to elemental sulph

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30

Sitando, Onias. "Gold Leaching in Thiosulfate-Oxygen Solutions." Thesis, Sitando, Onias (2017) Gold Leaching in Thiosulfate-Oxygen Solutions. PhD thesis, Murdoch University, 2017. https://researchrepository.murdoch.edu.au/id/eprint/38239/.

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31

Muslim, Abrar. "Thiosulfate leaching process for gold extraction." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/896.

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Increasing environmental concerns over the use of cyanide for gold recovery has intensified the need to deeply understand gold thiosulfate leaching system. Therefore, experimental and modelling work for the kinetics and equilibrium adsorption of thiosulfate, polythionates, gold and copper onto strong based anion exchange resin have been conducted in this study, and the results are concisely discussed in the thesis. Experimental procedures, reaction mechanisms and novel dynamic models for the adsorption phenomena were also proposed.

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32

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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33

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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34

Lee, Aik Heng. "Prediction of pollutant leaching from landfill." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/2182.

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Landfill is continued to be the most common approach to solid waste disposal. On contrary, landfill practice is still common with increase in water pollution due to leaching of pollutants.Leachate generation from landfill can be defined into two phases, firstly soluble salt produced due to aerobic decomposition or acetogenic phase and secondly methane and carbon dioxide due to anaerobic decomposition or methanogenic phase.Characterization of landfill leachate is used in design to achieve low hydraulic conductivity or decrease permeability as leachate percolating through the waste strata and mo

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35

Kaya, Serif. "High Pressure Acid Leaching Of Turkish Laterites." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612896/index.pdf.

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ABSTRACT HIGH PRESSURE ACID LEACHING OF TURKISH LATERITES Kaya, Serif M.Sc., Department of Metallurgical and Materials Engineering Supervisor: Prof. Dr. Yavuz A. Topkaya January 2011, 91 pages The aim of this thesis study was to investigate and find the most cost effective way of extracting nickel and cobalt into the pregnant leach solution (PLS) from G&ouml<br>rdes lateritic nickel and cobalt ore by means of sulphuric acid leaching under high temperature and high pressure conditions.The high pressure acid leach (HPAL) experiments were conducted with nontronitic and limonitic types of G&oum

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36

George, Anthe. "The leaching properties of co-combustion residues." Thesis, Imperial College London, 2005. http://hdl.handle.net/10044/1/12027.

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37

Blancarte-Zurita, Martha Alicia. "Controlled redox potential microbiological leaching of chalcopyrite." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28627.

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Leaching of chalcopyrite by Thiobacillus ferrooxidans under standard microbiological leaching conditions resulted in simultaneous solubilization of copper, iron and sulfur. The sulfide portion was oxidized preferentially over iron in solution suggesting a direct attack mechanism by the bacteria on the mineral particles. Copper extractions were low, 29-44%, with maximum specific copper extraction rates of the order of 0.001-0.006 h⁻¹ and cell yields per unit of copper released 4-43mg TOC/mg Cu. Leaching under redox-controlled conditions required a minimum pulp density, ca. 200 g/1, to result

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38

Rademan, Johan Andries Muller. "The simulation of a transient leaching circuit." Thesis, Link to the online version, 1995. http://hdl.handle.net/10019/3146.

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39

Stenemo, Fredrik. "Vulnerability assessments of pesticide leaching to groundwater /." Uppsala : Dept. of Soil Sciences, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200757.pdf.

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40

Torstensson, Gunnar. "Nitrogen availability for crop uptake and leaching /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1998. http://epsilon.slu.se/avh/1998/91-576-5507-3.gif.

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41

Onal, Mehmet Ali Recai. "Pressure Leaching Of Caldag Lateritic Nickel Ore." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615480/index.pdf.

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The purpose of this study was to investigate the process optimization of combined high pressure acid leaching (HPAL) and mixed hydroxide precipitation (MHP) route for the extraction of nickel and cobalt from &Ccedil<br>aldag lateritic nickel ore. In order to extract nickel and cobalt values into pregnant leach solution (PLS), several process parameters of HPAL including acid load, temperature, leaching duration and particle size were investigated in comparative manner at constant solid concentration and agitation speed. After HPAL trials, it has been found that more than one combination of par

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42

Parada, Torres Fernando Andrés. "The alkaline sodium sulphide leaching of enargite." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/34016.

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Leaching of enargite samples containing approximately 12 % As, 0.5 % Sb and 38 % Cu was studied in alkaline sodium sulphide solutions. Samples were leached in the presence of sodium hydroxide and sodium sulphide, which is expected to hydrolyse and form sodium hydrosulphide. Kinetic parameters studied included temperature, particle size, reagent concentration and stoichiometry in high pulp density tests. Leaching behaviour of arsenic and antimony was very similar; it was enhanced as temperature and reagent dosage was increased and/or particle size decreased. Copper, iron, zinc, and silver were

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43

Zaayman, Yolande. "Leaching kinetics of synthetic heazlewoodite / Y. Zaayman." Thesis, North-West University, 2004. http://hdl.handle.net/10394/646.

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The sources of base metals are mainly in the form of oxides or sulphides, of which the sulphides are predominantly present in South Africa. These metals are intergrown platinum group and base metals in the form of alloys and sulphides. In order to produce high grade saleable metals, it is necessary to effectively separate the base metals from the precious metals. By means of a hydrometallurgical process, that is leaching, metals can selectively be extracted from ores. The mechanism of leaching can be described by oxidation-reduction and acid-base reactions. During this study, the leaching of a

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44

MacArthur, Andrew. "Electrically accelerated leaching of simulated cementitious wasteforms." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19959/.

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UK disposal plans for intermediate-level nuclear waste (ILW) foresee its encapsulation in blends of Blast Furnace Slag and Portland cement (BFS:PC), held in steel drums and stored in a Geological Disposal Facility. Following groundwater ingress, wasteform degradation through leaching is possible and radionuclides could escape. Due to the long lifetime of hazardous waste, real-time experiments are infeasible, although it is necessary to gain detailed information about leaching performance of the wasteforms for key radionuclides and their transmutation products. This study aims at better underst

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45

Lok, Jonathan Y. "Acid Leaching of SHS Produced MgO/TiB2." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/35366.

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The stoichiometric Self-propagating High-temperature Synthesis (SHS) thermite reaction involving magnesium oxide (MgO), titanium dioxide (TiO2), and boron oxide (B2O3) forms titanium diboride (TiB2) and MgO as final products. Selective acid leaching is used to remove the MgO leaving high purity TiB2 powder. The SHS method to produce TiB2 is attractive because of the relatively low temperature required to initiate the reaction, fast reaction time, and product purity. This study investigates the acid leaching of SHS produced MgO/TiB2 and a stoichiometric mixture of commercial MgO and TiB2 powder

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46

Hirato, Tetsuji. "Studies on the Oxidative Leaching of Chalcopyrite." Kyoto University, 1986. http://hdl.handle.net/2433/74697.

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47

Watson, Jack. "Leaching for Reclamation (AZ Water Series #23)." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/144697.

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2 pp.<br>When salts build up in soil, they have to be removed to allow for plant growth. The amount of water required to accomplish this task depends upon the method of water application, the initial salinity of the soil, the final soil salinity desired, and the quality of the irrigation water. This publication provides the soil and water analysis for leaching salts from soil.

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48

Lim, Hazel. "Leaching of Rare Earths from Eudialyte Minerals." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/75841.

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The (a) sulfuric and (b) citric acid leaching of rare earths from two differently textured eudialyte minerals were investigated through leaching tests conducted using Taguchi and fractional factorial design of experiments. Results of the leaching studies showed that the use of novel method of citric acid yielded comparable leaching recoveries of 70-80 % to conventional sulfuric acid method on direct leaching of large-grained eudialyte. Fine-grained eudialyte required rigorous conditions for rare earths leaching.

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49

Vu, Quoc Hung. "Modelling pollutants leaching from recycled construction materials." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/130795/1/Quoc%20Hung_Vu_Thesis.pdf.

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This research developed new models to replicate metal leaching characteristics from recycled concrete aggregate (RCA) and reclaimed asphalt pavement (RAP). Model development was supported by a comprehensive experimental and analytical program with multiple influential factors. New models were developed so that they are readily applicable in commercial models to replicate pollutant leaching and solute transport in soil environments. Outcomes of this study will enhance the sustainable use of waste products such as RCA and RAP in the construction industry and relieve the stresses on natural quarr

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50

Vann, Kevin N. "Leaching behavior of personal computer central processing units (CPUs) using standardized and modified toxicity characteristic leaching procedure (TCLP) tests." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0001149.

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