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Rozprawy doktorskie na temat „Sulphide minerals”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 30 lipca 2024

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1

DiFeo, Anthony. "Heterocoagulation of sulphide minerals." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0032/NQ64547.pdf.

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Richardson, Stephen. "Sulphide ore minerals : surface chemical properties." Thesis, Aston University, 1988. http://publications.aston.ac.uk/8068/.

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The surfaces of iron-containing sulphide minerals were oxidised by a range of inorganic oxidants, and the resultant surface alteration products studied using various spectroscopic techniques. The characterisation of surface oxidation is relevant to the alteration of ores in nature and their behaviour during flotation and leaching, of importance to the metallurgical industry. The sulphides investigated included pyrite (FeS2), hexagonal pyrrhotine (Fe9S10), monoclinic pyrrhotine (Fe7Se), violarite (FeNi2S4), pentlandite ((FeiNi)9Se), chalcopyrite (CuFeS2) and arsenopyrite (FeAsS). The surfaces w

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3

Catherine, J. H. "The anodic dissolution of copper from complex sulphide minerals." Thesis, University of Exeter, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381574.

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Gudyanga, Francis Pedzana. "Electrohydrometallurgical reduction of cassiterite (SnO2) associated with sulphide minerals." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47090.

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Swarts, Arnoldus Carel. "The Influence of magnetic fields on the flotation of sulphide minerals." Diss., Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-02192007-094826.

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Goh, Siew Wei Chemistry Faculty of Science UNSW. "Application of surface science to sulfide mineral processing." Awarded by:University of New South Wales. School of Chemistry, 2006. http://handle.unsw.edu.au/1959.4/32912.

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Surface spectroscopic techniques have been applied to facets of the flotation beneficiation and hydrometallurgical extraction of sulfide minerals to enhance the fundamental understanding of these industrially important processes. As a precursor to the determination of surface chemical composition, the sub-surface properties of some sulfide minerals that have not previously been fully characterised were also investigated. The electronic properties of ??-NiS and ??-NiS (millerite), Ni3S2 (heazlewoodite), (Ni,Fe)9S8 (pentlandite), CuFe2S3 (cubanite), CuFeS2 (chalcopyrite), Cu5FeS4 (bornite) and C

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7

Sharma, Prashant K. "Surface studies relevant to microbial adhesion and bioflotation of sulphide minerals /." Luleå, 2001. http://epubl.luth.se/1402-1544/2001/37/index.html.

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Al-Harahsheh, Mohammad. "A fundamental investigation into the microwave assisted leaching of sulphide minerals." Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/11075/.

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Microwave assisted leaching has been investigated in an attempt to improve both the yield of extracted metal and reduce processing time. This is especially pertinent in view of the increased demands for metal and more environmentally friendly processes. This work reports a fundamental study on the influence of microwave energy on the dissolution of sulphide minerals. Chalcopyrite and sphalerite were chosen as model materials due to their economic importance and the diversity of their heating behaviour in a microwave field (chalcopyrite being an excellent microwave heater and sphalerite being a

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9

Hunter, C. J. "An electrochemical investigation of the froth flotation of iron bearing sulphide minerals." Thesis, Brunel University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.351913.

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Taguta, Jestos. "The thermochemical behaviour of thiol collectors and collector mixtures with sulphide minerals." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/20124.

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Thiol collectors continue to dominate the base metal sulphide (BMS) and platinum group mineral (PGM) flotation industry. The behaviour of thiol collectors and collector mixtures with sulphide mineral surfaces has been extensively studied using different techniques such as XPS, ToF-SIMS, UV-VIS, etc. However, most of these techniques require a collector dosage above monolayer coverage, take place under equilibrium conditions and may not simulate flotation conditions. Moreover, most of the studies focus on isolated minerals yet exploitable ores exist as an association of sulphide minerals. The u

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11

Chimonyo, Wonder. "An investigation into the relationship between electrochemical properties and flotation of sulphide minerals." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20730.

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There is a growing importance in the mineral processing industry to find ways which are economic and effective in improving the recovery of minerals in the flotation process. The focus of this study was on the recovery by flotation of minerals found in the Merensky reef, which is one of the major reefs in the Bushveld complex. In that reef, base metal sulphide (BMS) minerals are commonly associated with PGMs and this has an effect on the way in which these minerals are concentrated by flotation (Vermaak et al. 2004; Wiese et al. 2005b; Miller et al. 2005; Schouwstra et al. 2000).A major proble

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12

Rossouw, Deon. "A technical risk evaluation of the Kantienpan volcanic hosted massive sulphide (VHMS) deposit and its financial viability." Pretoria : [s.n.], 2003. http://upetd.up.ac.za/thesis/available/etd-08132008-094204/.

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13

Sui, Chihyu Caroline. "Metal ion transfer between sulphide minerals and effect on xanthate interaction with pyrite." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40263.

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Metal ion production by minerals alone and in pairs was studied by solution analysis, extraction with ethylene diamine tetraacetate (EDTA) and laser ion mass spectroscopy (LIMS) for combinations of pyrite, pyrrhotite, galena, and sphalerite. The effect of grinding, pH, and the presence of xanthate was studied. Metal ion transfer between sulphide minerals was determined.<br>Metal ion production with minerals in pairs was different from that for single minerals. The amount of metal ion in solution followed a galvanic interaction model, increasing for the anodic mineral and decreasing for the cat

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14

Todd, Emma Claire. "Surface oxidation of sulphide minerals : nanomineralogy and electronic structure from x-ray spectroscopy." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274619.

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15

Khalid, Muhammad. "Gold cyanidation : gold associated with silver minerals embedded within base-metal sulphide matrices." Doctoral thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27893.

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Les problématiques dans le traitement des minerais aurifères deviennent de plus en plus significatives avec la déplétion des gisements à haute teneur autour du monde. L’or est trouvé principalement sous forme métallique dans la nature et est fréquemment associé avec des minéraux d’argent ou des sulfures métalliques. Dans la présente thèse, le rôle des minéraux d’argent sur la cyanuration de l’or au sein de sulfures métalliques est étudié en détail relativement aux interactions galvaniques et aux phénomènes de passivation de surface. Puisque les contacts galvaniques permanents naturellement pré

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16

Belissont, Rémi. "Germanium and related elements in sulphide minerals : crystal chemistry, incorporation and isotope fractionation." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0049/document.

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Le germanium est un métalloïde « stratégique » dans l’industrie high-tech, notamment pour la transition énergétique et le secteur des communications. Étant distinctement sidérophile, lithophile, chalcophile et organophile, le Ge possède un fort potentiel comme traceur géochimique. Ces travaux de thèse visent à améliorer la compréhension de la géochimie du cycle du Ge et des facteurs qui contrôlent son incorporation dans les minéraux et les gisements métalliques. Les cibles de cette étude concernent le gisement filonien à Zn de Saint-Salvy (Massif Central, France), le gisement filonien à Cu de

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17

Vilinská, Annamária. "Microbial adhesion and surface modifications of sulphide minerals relevant to flotation and flocculation /." Luleå : Division of Extractive Metallurgy, Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/3328441.

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Witne, John Yagbinan. "The effects of oxygen and carbon dioxide enriched air on the bacterial oxidation of sulphide concentrates." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302672.

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Biohydrometallurgical techniques are quite established for the treatment of certain sulphide minerals and others have been demonstrated at laboratory or pilot plant scale level, where iron and sulphuroxidising bacteria are utilised for the leaching of low grade sulphide ores and the pretreatment of gold ores and concentrates. The majority of the microorganisms which are used for bacterial leaching are autotrophic aerobes, therefore carbon dioxide and oxygen are essential nutrients for their growth and survival, adequate supplies must be ensured in order for the oxidation process to be successf

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19

Sitoka, Stefanus. "Exploration status for oxide and sulphide zinc ores at Skorpion Zinc Mine, Namibia." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018204.

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The thesis is inspired by recent interests in oxide zinc ores caused by new developments in the technology of hydrometallurgy. The improved techniques turned the non-sulphide zinc ores in to attractive exploration targets due to a number of advantages such as low metal recovery costs and favorable environmental aspects such as the obvious absence of sulfur (Large, 2001). Historically extraction of zinc metal from oxide ores was not possible until recently. The metallurgical complexity resulted in a lack of interest and hence some economic oxide zinc ores might have been missed by conventional

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20

Ayling, K. J. "Chloride leaching of complex sulphide minerals and recovery of copper using the C.E.E.R. cell." Thesis, Open University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253768.

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21

Marsland, Simon David. "Non-oxidative dissolution of iron sulphide minerals : of relevance to inorganic chemical souring of oil reservoirs." Thesis, Imperial College London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326670.

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22

Corkhill, Claire L. "The mineralogical and biogeochemical transformations associated with As-bearing sulphide minerals in acid mine drainage system." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494293.

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Arsenopyrite (FeAsS) and enargite (CU3ASS4) are the most common As-bearing sulphide minerals in acid mine drainage environments. Orpiment (AS2S3) and realgar (AsS) are also found. In the environment, these minerals are unstable under oxidising conditions, and significant concentrations of As can be released into groundwater upon weathering. Acidophilic bacteria such as Leptospirillum ferrooxidans have been shown to enhance the dissolution of sulphide minerals in these environments, and could therefore accelerate the release of arsenic.

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23

Warner, Terence Edwin. "An electrochemical study of the oxidative dissolution of synthetic nickel-iron sulphide minerals in aqueous media." Thesis, University of Leeds, 1988. http://etheses.whiterose.ac.uk/1075/.

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Pentlandite (Fe4.5Ni4.5S8) and violarite (FeNi2S4) were synthesized by dry in vacuo techniques. The products were analysed by reflected light microscopy, powder X-ray diffraction and electron microprobe analysis. The synthetic pentlandite was found to have an average stoichiometry of Fe4.35Ni4.65S8. A partial phase segregation of pentlandite into heazlewoodite and pyrrhotite was observed. The synthetic violarite grains showed a zonal separation into a Fe1.2Ni1.8S4 core, and a Fe0.5Ni2.5S4 rim. Trace amounts of pyrite and millerite were also detected. From a critical review of the thermodynamic

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24

Čiutelytė, Rūta. "Biogas yield and quality improvement and purification with natural minerals." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20131004_191808-62516.

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Research goal and objective. To investigate the possibilities of the use of mineral raw materials of local origin for the purification of biogas produced from sewage sludge, by-products and waste and to assess the environmental benefits of the use of biogas in the transport sector. The properties of by-products and waste generated in Lithuania as well as the possibilities of their use in the production of biogas from sewage sludge have been assessed. The potential and properties of local mineral raw materials suitable for the purification of biogas have been assessed. The process of the remova

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25

Whiteley, Robert School of Mines UNSW. "Electrical and seismic responses of shallow, volcanogenic, massive sulphide ore deposits." Awarded by:University of New South Wales. School of Mines, 1986. http://handle.unsw.edu.au/1959.4/28078.

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SP, resistivity/IP and seismic refraction responses of the Woodlawn Orebody and Mt.Bulga Deposit are examined and compared. Both exhibit similar responses produced mainly by uneconomic and disseminated sulphide mineralization and host rock features, demonstrating that the magnitude and character of electrical and seismic responses are not reliable indicators of size and economic sulphide content of volcanogenic sulphide ores. SP, soil geochemistry and electrogeochemistry are found to be the most effective exploration methods followed by resistivity/IP and seismic refraction. The large SP respo

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26

Hulley, Vierah. "Reactions between country rock xenoliths and the magma of Uitkomst Complex, with implications for the origin of the sulphide mineralisation." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-05282008-101011.

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Ghavami-Riabi, Reza. "Geochemical exploration for base metal sulphide deposits in an arid environment (eastern Namaqua Metamorphic Province), South Africa." Thesis, Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-06192007-100552.

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Koegelenberg, Corne. "Experimental evidence for sulphide magma percolation and evolution : relevant to the chromite bearing reefs of the Bushveld Complex." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20043.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Pt mineralization within the Bushveld Complex is strikingly focused on the chromitite reefs, despite these horizons being associated with low volumes of base metal sulphide relative to Pt grade. Partitioning of Pt (Dsil/sulp) from silicate magma into immiscible sulphide liquid appears unable to explain Pt concentrations in chromitite horizons, due to the mismatch that exists between very large R factor required and the relevant silicate rock volume. Consequently, in this experimental study we attempt to gain better insight into

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29

Bonel, Kevin Anthony. "The mode of occurrence, recovery characteristics and petrogenesis of platinum-group and base metal sulphide minerals in the UG2 chromitite at Northam Platinum Mine, South Africa." Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297790.

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Rapp, Andrei. "Undersökning av lakningspotential och kristallareafördelning av opaka mineral i bergarter från Ekobacken, Värmdö kommun." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-384007.

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Ekobacken, Värmdö kommun, har problem med surt yt- och grundvatten med höga metallhalter. Uppmärksamheten har riktats mot berggrunden som krossats och lagrats i deponihögar. Bildningen av sur lak styrs av flertalet geokemiska egenskaper, bland annat vilka sulfidmineral som förekommer och deras kristallstruktur. Prover från Ekobacken har undersökts utifrån sulfidhalt, kristallarea för opaka mineral och surgörande potential för att kunna utröna om ett samband finns mellan kristallareafördelning och lakningsegenskaper. Proverna har mikroskopiskt undersökts i reflekterande ljus för att skilja ur v

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Seat, Zoran. "Geology, petrology, mineral and whole-rock chemistry, stable and radiogenic isotope systematics and Ni-Cu-PGE mineralisation of the Nebo-Babel intrusion, West Musgrave, Western Australia." University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0202.

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The Nebo-Babel Ni-Cu-platinum-group element (PGE) magmatic sulphide deposit, a world-class ore body, is hosted in low-MgO, tube-like (chonolithic) gabbronorite intrusion in the West Musgrave Block, Western Australia. The Nebo-Babel deposit is the first significant discovery of a nickel sulphide deposit associated with the ca. 1078 Ma Giles Complex, which is part of the Warakurna large igneous province (LIP), now making the Musgrave Block a prime target for nickel sulphide exploration. The Musgrave Block is a Mesoproterozoic, east-west trending, orogenic belt in central Australia consisting of

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Nanthakumar, Balakrishnan. "Use of silica sol in selective sulphide mineral flotation." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32969.

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Micro- and batch flotation tests were conducted to explore the use of silica sol to control metal ions to reduce accidental activation and misplacement of minerals. As a comparison other 'metal control reagents', ethylenediaminetetraacetic acid (EDTA) and polyphosphate were also tested. X-ray photoelectron spectroscopy (XPS) was used to probe the silica sol-mineral interaction mechanism.<br>Micro flotation was performed on single mineral samples over a pH range 7 to 11. It was found that silica sol depressed all Cu minerals, Cu and Pb activated pyrite and Pb activated sphalerite but did not de

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Javadi, Alireza. "Sulphide mineral flotation : a new insight into oxidation mechanisms." Licentiate thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25773.

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Formation of hydrogen peroxide (H2O2), an oxidizing agent stronger than oxygen, by sulphide minerals during grinding was investigated. It was found that pyrite (FeS2), chalcopyrite (CuFeS2), sphalerite ((Zn,Fe)S), and galena (PbS), which are the most abundant sulphide minerals on Earth, generated H2O2 in pulp liquid during wet grinding in the presence or devoid of dissolved oxygen in water and also when the freshly ground solids are placed in water immediately after dry grinding. Pyrite generated more H2O2 than other sulphide minerals and the order of H2O2 production by the minerals found to b

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Yang, Ying Ping. "Electromagnetic characteristics of synthetic rocks, and sulphide and oxide mineral assemblages." Thesis, The University of Sydney, 1995. https://hdl.handle.net/2123/26849.

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An understanding of the electromagnetic characteristics of sulphide-bearing and magnetite-bearing rock and ore samples is important in the interpretation of electromagnetic (EM) exploration data. In this research study of electromagnetic conductivity characteristics, a theoretical measurement basis was developed, synthetic analogue materials were studied and the theory and analogue results were related to rock samples of varied mineralogy, texture and mineral concentration. The theory developed for cylindrical core sample EM measurements agreed with experiments performed on standard conduct

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Alarcon, Leon Edgardo. "Pyrite weathering and lithium (Li?) transport under unsaturated flow conditions in model and mine-tailing systems." University of Western Australia. School of Earth and Geographical Sciences, 2005. http://theses.library.uwa.edu.au/adt-WU2006.0011.

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[Truncated abstract] As mineral deposits continue to be mined, the non economic gangue materials such as sulphides (e.g. pyrite) that are extracted as part of the ore body or overburden are deposited within the waste rock and/or milled tailings. As a result of natural weathering processes, these reactive materials represent a potential hazard to surrounding environments. A major consequence, resulting from mine-waste impoundments containing sulphidic materials, relates to the offsite movement of low pH leachates containing elevated concentrations of metal ions posing a contamination threat. Th

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Quezada, Reyes Víctor Alejandro. "Pretreatment to the leaching of copper sulphides minerals in oxidizing media." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/670663.

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La producción chilena de cobre procede de la hidrometalurgia y la concentración; el concentrado de cobre es tratado tradicionalmente mediante pirometalurgia. De acuerdo a Cochilco, el cobre producido en el año 2019, vía hidrometalurgia, fue un 27.3% del cobre chileno producido. Sin embargo, se prevé que esta aporte baje a un 11.6% para el año 2029, debido al agotamiento de los óxidos de cobre y la aparición de los sulfuros, principalmente calcopirita, siendo este mineral refractario a condiciones convencionales de lixiviación. Una opción para mejorar la eficiencia de lixiviación es el pretr

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Vigânico, Eunice Maria. "Protótipo em escala piloto para produção de sulfato ferroso a partir de concentrado de pirita da mineração de carvão." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/117757.

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O presente trabalho teve como objetivo desenvolver um protótipo para a produção hidrometalúrgica de sulfato ferroso heptahidratado (FeSO4.7H2O – melanterita). A matéria prima foi um concentrado de pirita obtido a partir de rejeitos do beneficiamento de carvão mineral. Construiu-se, em escala piloto, uma planta de lixiviação com 300 kg de um concentrado com 73,2% de pirita. Nesta unidade, realizou-se uma etapa de lixiviação com água, em circuito fechado, sob condições aeróbias, com o intuito de se obter um extrato aquoso rico em íons férrico e sulfato. A seguir, procederam-se mudanças no sistem

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Adegoke, Idowu Abiodun. "Experimental studies on hydrothermal mineral replacement of bornite by copper sulphides." Thesis, Adegoke, Idowu Abiodun (2021) Experimental studies on hydrothermal mineral replacement of bornite by copper sulphides. PhD thesis, Murdoch University, 2021. https://researchrepository.murdoch.edu.au/id/eprint/60897/.

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Pseudomorphic mineral replacement reactions occur in numerous geological processes (e.g. metamorphism, metasomatism, ore deposition, and chemical weathering) and anthropogenic processes (e.g., reservoir acidification, CO2 sequestration, acid mine drainage, materials syntheses, and minerals processing). Therefore, the understanding of the mechanism and kinetics of these reactions is important not only to geosciences but also to industrial applications. These reactions involve the replacement of a primary mineral by a product mineral in the presence of a fluid phase, with the product mineral pre

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Hildyard, Rebecca Christine. "The Textures and Microstructures of the Calcium Sulphate Minerals Anhydrite Gypsum and Bassanite." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526946.

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Evaporitic rocks containing minerals such as anhydrite, gypsum and bassanite, are of central importance in a number of geological scenarios. They play an important role in localizing deformation, acting as detachment horizons in many foreland fold and thrust belts, implying that their strength is generally lower than other rocks. Characterizing the microstructure of evaporites is therefore important for interpreting the larger scale deformation history of these rocks. Dehydration reactions of high grade metamorphic rocks, e.g. serpentinite, in subduction zones, are thought to be one mechanism

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40

Shackleton, Natalie Jean. "Surface characterisation and flotation behaviour of the platinum and palladium arsenide, telluride and sulphide mineral species." Doctoral thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/5403.

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Includes bibliographical references (leaves 170-181).<br>The Platreef is located in the northern limb of the Bushveld Complex of South Africa. This reef consists of a complex assemblage of rock types, with pyroxenites, serpentinites and calcsilicates being the most abundant. The predominant PGMs are the tellurides, arsenides, alloys and sulphides. The Pt and Pd tellurides contribute between 20-45% of the PGMs present in the Platreef ore followed by the alloys (26%), arsenides (21%) and sulphides (19%). Flotation is used in the processing of the Platreef ore to separate the siliceous gangue fro

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Bromfield, Lucinda. "Factors affecting the attachment of Metallosphaera hakonensis during the colonisation of low grade mineral sulphide heaps." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10217.

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This thesis pertains to the extraction of copper via heap bioleaching, focussing specifically on the bioleaching of the mineral sulphide, chalcopyrite (CuFeS2). Industrial heap bioleaching offers an attractive alternative to conventional extraction methods, such as smelting, for processing low grade ores. There remain a number of operational challenges associated with bioleaching heaps, such as the lag time before efficient extraction is achieved and ineffective heap inoculation, as well as the difficulty in controlling the conditions within the heap.

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Wengorsch, Tobias. "Experimental Alteration in Composite Mineral Systems: Mg-silicates, Fe-Ni-sulphides and Fe-Ti-oxides." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/78546.

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This study provides new insight into fluid-mediated replacement reactions for three different mineral systems. Hydrothermal experiments were conducted at 150 °C and 240 °C. It was found that serpentinisation reaction kinetics and crystal morphology are dependent on fluid and solid composition. Furthermore, primary Ni-sulphides were transformed into high Ni-tenor assemblages and it was found that the generation of fracture networks within ilmenite is strongly affected by the presence of hematite.

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Kotsiopoulos, Athanasios. "Development of an unsteady state model for the tank bioleaching of sulphide mineral concentrates in flow reactor systems." Doctoral thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/10849.

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Includes bibliographical references.<br>In this thesis, it is hypothesized that in bioleaching flow reactor systems, high reaction rate regions exist that can be maintained by application of biological stress trajectories. Reactor models are developed for the purpose of optimising plant operation, understood here as maximising the production rate. Complicating this attempt are a) the non-linear dynamics associated with the kinetics and b) the primary reaction's being multiphase. Mathematical models are developed to establish which particle parameters are necessary to describe reactor performan

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Mamuse, Antony. "Spatial statistical estimation of undiscovered mineral endowment: case of komatiite-associated nickel sulphide resources, Kalgoorlie Terrane, Western Australia." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/449.

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The Kalgoorlie Terrane of the Yilgarn Craton, Western Australia, containing about 60% (~11 Mt) of the world’s known komatiite-hosted nickel sulphide resources, is the world’s best studied and economically most important province for this mineral deposit type. Although increasingly mature in terms of nickel exploration, the Kalgoorlie Terrane is believed to contain significant additional undiscovered nickel endowment. Using the data-rich Kalgoorlie Terrane, this thesis develops a benchmark methodology that combines geological knowledge with spatial analysis and mathematical-statistical methods

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Stalder, Marcel. "Petrology and mineral chemistry of sulphide ores and associated metalliferous rocks of the Gamsberg Zn-Pb deposit, South Africa : implications for ore genesis and mineral exploration." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16072.

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Thesis (PhD)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: The Gamsberg Zn-Pb deposit is a metamorphosed and multiply deformed sediment-hosted base metal deposit in the central Namaqua Province of South Africa. The deposit is hosted by the Bushmanland Group, a late Palaeoproterozoic (2000-1600 Ma) supracrustal succession of quartzite, metapelitic schist and interbedded metavolcanic rocks. Mineralisation occurs within the central part of the Gams Formation, a heterogeneous sequence of metamorphosed metalliferous sediments and fine-grained organic-rich shales. The ore horizon is s

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Greben, Harma. "The biological sulphate removal process." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52490.

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Thesis (MSc)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: South Africa is one of the world's major coal producers, resulting in the second highest foreign exchange earner for South Africa. However, the mining industry contributes negatively to (ground) water pollution, due to the formation of acid mine drainage (AMD). AMD originates from the bacterial oxidation (Thiobacillus ferrooxidans) of pyrite (FeS) and contains high levels of sulphate and metals. Sulphate rich waters can be treated applying the biological sulphate removal technology. This study concentrated on biologica

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Johansson, Simon. "Ore mineralogy and silver distribution at the Rävliden N volcanogenic massive sulphide deposit, Skellefte district, Sweden." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66264.

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The Rävliden North deposit (Rävliden N) is a volcanogenic massive sulphide (VMS) deposit in the western part of the Skellefte district, northern Sweden. The district is one of Sweden’s major metallogenic provinces with a significant amount of VMS deposits. The Rävliden N deposit, discovered in 2011, contains copper, zinc, lead, silver and subordinate gold and occurs close to the largest VMS deposit in the district, the Kristineberg deposit, which has been mined for more than 70 years. The purpose of this master thesis is to study the composition, mineralogy and paragenetic relationships in dif

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Armstrong, John P. "Variations in silicate and sulphide mineral chemistry between free-milling metallic and refractory invisible gold ores, Con Mine, Yellowknife, Northwest Territories." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ28472.pdf.

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Roman, Henry James. "The degradation of lignocellulose in a biologically-generated sulphidic environment." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1004057.

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South Africa is renowned for its mining industry. The period over which the polluted waters from the existing and abandoned mines will require treatment has driven research into the development of passive treatment systems. These waters are characterised by a low pH, high concentrations of heavy metals, high levels of sulphate salts and low concentrations of organic material. The biological treatment of these waters has been a subject of increasing focus as an alternative to physicochemical treatment. The utilisation of lignocellulose as a carbon source has been restricted by the amount of red

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Boshoff, Genevieve Ann. "Development of integrated biological processing for the biodesalination of sulphate- and metal-rich wastewaters." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1003958.

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The substantial pollution threat to the South African environment from acid mine drainage (AMD) effluents has been well documented. Due to the juvenile nature of acidity in these flows, any remediation strategies implemented will need to function effectively and at low cost for long periods of time. The widespread use of sulphate reducing biological systems for the treatment of such effluents, and in particular large volume flows, has been limited. The supply of inexpensive electron donor and carbon sources, as well as appropriate reactor designs capable of handling large volume flows, have be

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