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Rozprawy doktorskie na temat „Nickel-sulphide”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Lane, Monica Leonie. "Nickel sulphide mineralization associated with Archean komatiites." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005594.

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The distribution of Archean Nickel sulphide deposits reflects tectonic controls operating during the evolution of the granitoid greenstone terrains. Important deposits of komatiitic-affinity are concentrated within, and adjacent to, younger (∼2.7 Ga), rift-related greenstone belts (e.g. Canada, Western Australia and Zimababwe). Two important classes of Archean Nickel sulphide deposits exist, formerly known as "Dunitic" and "Peridotitic", these are now referred to as Group I and Group II deposits, based on their characteristic structure and composition. Mineralization varies from massive and ma

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2

Cameron, Rory. "Bioleaching of low-grade nickel sulphide ore at elevated pH." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19784.

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This thesis examines the bioleaching of six different Canadian nickel sulphide ores at pH levels above what is generally considered optimum (~ 2). The majority of work discussed in this thesis was conducted with a low-grade metamorphosed ultramafic nickel sulphide ore from Manitoba, Canada (Ore 3), which is not currently exploitable with conventional technologies. The ore contains 21% magnesium and 0.3% nickel. Nickel is the only significant metal value, and is present primarily as pentlandite. A substantial fraction of the magnesium is present as the serpentine mineral lizardite, making proce

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3

Henriques, Leal Andrade Bianca. "Potential Use of Oxygen Depleted Air In Nickel Sulphide Flotation." Thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70460.

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Copper-nickel low grade ore deposits normally have complex mineralogy and process behaviour. Implementing an optimum process that is able to recover all the valuable minerals efficiently is challenging. One concentration strategy in mineral processing of copper-nickel sulphide ores is stage-wise flotation. The first flotation stage concentrates mainly copper minerals. The copper middling is re-floated to obtain nickel concentrate.During the industrial process of copper-nickel ore, it was observed that significant amount of nickel sulphides was lost to the tailings during the nickel flotation.

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4

Thangwane, Selaelo Christabel. "Synthesis and characterization of substituted dithiocarbamates ligands and complexes as a source of metal (Pb, Ni & Co) sulphide nanoparticles." Thesis, Vaal University of Technology, 2017. http://hdl.handle.net/10352/396.

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M. Tech. (Department of Chemistry, Faculty of Applied and Computer Sciences), Vaal University of Technology.<br>Lead, nickel and cobalt dithiocarbamates complexes were synthesized using methanol and water as solvents. All complexes were refluxed at 60 °C, cooled at room temperature, washed with methanol to remove the impurities and dried under the fume hood. A combination of Fourier transformer infrared (FTIR), elemental analysis (EA) and thermogravimetric analysis (TGA) were used to characterize these complexes. There was shifting of bands from low to high frequencies of the dithiocarbamates

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5

Nuttall, Robert Horan. "Aqueous hydrogen sulphide corrosion of iron, iron/chromium and iron/nickel alloys." Thesis, Robert Gordon University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358471.

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6

Evans, David Morris. "The role of magma contamination in the genesis of komatiitic nickel sulphide deposits, Kambalda, Australia." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/12008.

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7

Karbanee, Nazneen. "Investigation towards controlled precipitation of nickel using H2S(g) by harnessing pH dependent sulphide speciation." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/5308.

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Includes bibliographical references (leaves 109-114).<br>Sulphide as a precipitating agent is effective as it facilitates the removal of heavy metals to very low residual concentrations (ppm - ppb levels) over a wide pH range, owing to the low solubilities (Ksp) of metal sulphides. However, previous work on metal sulphide precipitation has highlighted a number of challenges. The low solubilities of metal sulphides in combination with the rapid kinetics of sulphide precipitation leads to rapid, uncontrolled metal sulphide precipitate formation. The extremely high supersaturations result in high

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8

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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9

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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10

De, Joux Alexandra. "Cosmos greenstone terrane : insights into an Archaean volcanic arc, associated with komatiite-hosted nickel sulphide mineralisation, from U-Pb dating, volcanic stratigraphy and geochemistry." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8918.

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The Neoarchaean Agnew-Wiluna greenstone belt (AWB) of the Kalgoorlie Terrane, within the Eastern Goldfields Superterrane (EGS) of the Yilgarn Craton, Western Australia, contains several world-class, komatiite-hosted, nickel-sulphide ore bodies. These are commonly associated with felsic volcanic successions, many of which are considered to have a tonalite-trondhjemite-dacite (TTD) affinity. The Cosmos greenstone sequence lies on the western edge of the AWB and this previously unstudied mineralised volcanic succession contrasts markedly in age, geochemistry, emplacement mechanisms and probable t

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11

Alzaid, Ali H. "Impact of conjugated olefins on nickel-molybdenum-sulphide supported on gamma-alumina catalyst deactivation and fouling of naphtha hydrotreaters." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58480.

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This dissertation investigates the reactions of conjugated olefins that lead to catalyst deactivation and fouling in naphtha hydrotreater reactors using a commercial Ni-Mo-S/γ-Al₂O₃ catalyst. The reactions were performed in a micro-scale fixed bed reactor system operated at 150-250°C, 3-4 MPa H₂, LHSV of 1-8 hr-¹ and a H₂/feed ratio of 392-1200 standard mL/mL. During isoprene hydrogenation, an increase in dimerization activity with temperature was attributed to a higher activation energy of dimerization compared to hydrogenation. Conjugated olefin content was also shown to impact oligomeri

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12

Piercey, Stephen John. "An integrated study of magmatism, magmatic nickel-copper sulphide mineralization and metallogeny in the Umiakoviarusek Lake region, Labrador, Canada." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0019/MQ54906.pdf.

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13

Jardine, Mitchel. "Three dimensional quantitative textural analysis of nickel sulphide ore using X-ray computed tomography and grey level co-occurrence matrices on drill core." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20489.

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Alongside the global trend to mine and process lower grade and more mineralogically complex ores, there has been an increased awareness of the prevalence of ore heterogeneity. Ore texture - the interrelationship of minerals comprising a rock, has been identified as one of the primary geometallurgical indicators of ore variability. It is well known that a relationship exists between ore texture and the resultant metallurgical performance (ore hardness, throughput, liberation, grade, recovery). Consequently, there exists a need to rapidly, routinely, cost effectively, and reliably quantify ore t

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14

Dwyer, Berni Lori. "A compiled geological, geochemical, and metallogenic study of a magmatic nickel-copper sulphide occurrence at the Cirque property, Nain Plutonic suite, Northern Labrador /." Internet access available to MUN users only, 2001. http://collections.mun.ca/u?/theses,36819.

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15

Evans-Lamswood, Dawn. "Physical and geometric controls on the distribution of magmatic and sulphide-bearing phases within the Voisey's Bay nickel-copper-cobalt deposit, Voisey's Bay, Labrador /." Internet access available to MUN users only, 1999. http://collections.mun.ca/u?/theses,26958.

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Thesis (M.Sc.), Memorial University of Newfoundland, 2000.<br>Restricted until January 2002. The CD-ROM "includes a series of .AVI files... the .AVI files are digital video captures of the 3-dimensional models used to produce the 2 dimension figures contained in this document." Bibliography: leaves 254-265. Also available online.

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16

Yousfi, Oussama. "Transformations de phase des sulfures de nickel dans les verres trempés." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0031.

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Le sulfure de nickel (NiS) peut former des inclusions dans les verres trempés conduisant à une fracture due à la transformation de phase avec changement de volume. Un traitement thermique, provoquant cette transformation de phase, est actuellement utilisé afin de réduire cet effet. Pour proposer des traitements plus efficaces, une étude allant des mécanismes de transformation jusqu’à la modélisation a été menée. Selon la composition et la température, deux mécanismes de transformation (avec ou sans partition) ont été mis en évidence par l’étude microstructurale et calorimétrique donne les lign

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17

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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18

Piercey, Stephen John. "An integrated study of magmatism, magmatic Ni-Cu sulphide mineralization and metallogeny in the Umiakoviarusek Lake Region, Labrador, Canada /." Internet access available to MUN users only, 1998. http://collections.mun.ca/u?/theses,32157.

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19

Pietrobon, Michael C. "Chemical aspects in the flotation of pentlandite in Western Australian nickel ores." 1996. http://arrow.unisa.edu.au:8081/1959.8/84872.

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20

Huberts, Robert. "Application of electrochemical kinetics to elucidate the leaching mechanism in the bio-oxidation of a synthetic nickel sulphide." Thesis, 2015. http://hdl.handle.net/10539/16901.

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The importance of the direct and indirect mechanisms in the bacterial leaching of a synthetic nickel sulphide is investigated using an electrochemical leaching model. Sterile controls runs, in which only ferric leaching took place, are compared with runs in the presence of an active, adapted bacterial culture. The direct mechanism occurs when bacteria attach to the sulphide mineral and catalyze the oxidation of the mineral, presumably with enzymes (biological catalysts). No evidence was found of the direct mechanism, in fact ferric leaching appeared to be inhibited as the bacterial

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21

Brown, James A. "Interfacial studies of liquid sulphur during aqueous pressure oxidation of nickel sulphide." 2004. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=95189&T=F.

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22

Kahn, Riyard. "Optimisation of reagent addition during flotation of a nickel sulphide ore at the Nkomati Mine concentrator." Thesis, 2017. http://hdl.handle.net/10539/22965.

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A dissertation submitted to the faculty of Engineering and the Built Environment, University of Witwatersrand in fulfilment of the requirements for the degree of Master of Science in Engineering 28 January 2017<br>Batch scale laboratory testwork was conducted to evaluate collector and depressant addition on flotation performance of a nickel sulphide ore. The objectives of the study were to: 1. develop an understanding of the effects of collector and depressant dosage, and its interactive effects, on flotation performance and 2. determine the effect of stage dosing collector and depressant o

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23

Liwanag, Janice. "Post-magmatic modification of the sulphide deposits from the Thompson Nickel Belt, Manitoba, Canada." 2009. http://hdl.handle.net/1993/3728.

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Disseminated to massive sulphides from the Thompson Nickel Belt, Manitoba, show textural and geochemical evidence of being modified by deformation and fluid alteration. Samples of massive sulphide horizons, hosting metasediments, sulphidebearing ultramafic rocks, and sulphide breccias were collected from the Thompson, Birchtree, and William Lake deposits. Sulphide minerals from these samples were examined petrographically and analyzed by electron microprobe analysis (EMPA) and proton-induced X-ray emission (PDG). Representative samples were analyzed by whole-rock geochemical techniques. Compo

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24

Chiwundura, Phillip. "Application of indicator kriging and conditional simulation in assessment of grade uncertainty in Hunters road magmatic sulphide nickel deposit in Zimbabwe." Thesis, 2017. https://hdl.handle.net/10539/24082.

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A research project report submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, in fulfilment of the requirements for the degree of Masters of Science in Engineering, 2017<br>The assessment of local and spatial uncertainty associated with a regionalised variable such as nickel grade at Hunters Road magmatic sulphide deposit is one of the critical elements in the resource estimation. The study focused on the application of Multiple Indicator Kriging (MIK) and Sequential Gaussian Simulation (SGS) in the estimation of recoverable resourc

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Frimpong, Augustine. "Evaluation and improvement of the nickel sulphide fire assay method with ICP-MS finish, for analysis of rocks for the precious metals /." 1992. http://collections.mun.ca/u?/theses,125915.

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Steenkamp, Nicolaas Casper. "Alteration assemblage in the lower units of the Uitkomst Complex, Mpumalanga Province, South Africa." Thesis, 2012. http://hdl.handle.net/2263/27714.

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The Uitkomst Complex is located within the Great Escarpment area close to the town of Badplaas, approximately 300 km due east of Pretoria, in the Mpumalanga Province, South Africa. This complex is believed to represent a layered conduit system related to the 2.06 Ga Bushveld Complex. The succession from the bottom up comprises the Basal Gabbro- (BGAB), Lower Harzburgite- (LHZBG) and Chromitiferous Harzburgite (PCR) Units, collectively referred to as the Basal Units, followed by the Main Harzburgite- (MHZBG), Upper Pyroxenite-(PXT) and Gabbronorite (GN) Units, collectively referred to as the Ma

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27

Smith, Roderick L. "The basal gabbro subdivision and associated magmatic nickel-copper sulphide mineralization of the Pants Lake intrusion, Labrador, Canada : a combined geological, petrological, geochemical, and metallogenic study /." 2006. http://collections.mun.ca/u?/theses,68970.

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