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Dissertations / Theses on the topic 'Nickel sulfide'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Huang, Shanshan. "Nanoparticulate nickel sulfide." Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54754/.

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Nickel sulfide possesses a variety of typical structures and stoichiometries that distinguish itself from iron sulfide and exhibits unique roles in the prebiotic reactions which are proposed to be involved in the origin of life. Nickel sulfide precipitate is hydrated and nanocrystalline, modelled as a 4 nm sphere with a 1 nm crystalline and anhydrous NiS (millerite) core, surrounded by a hydrated and defective mantle phase. It is a metastable but fairly robust structural configuration. It may be formulated as NiSxFbOx approximates to 1.5 and decreases on heating. The fresh nanoparticulate nick

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2

Weatherwax, Trent. "Integrated mining and preconcentration systems for nickel sulfide ores." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/238.

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As part of a strategic research initiative at UBC to design and evaluate integrated underground mining and mineral processing systems, work has been done to determine how to utilize the coarse rejects of pre-concentration in the underground environment. An amenability study for nine orebodies from four of Xstrata Nickel’s Ontario operations evaluated both processing and waste disposal methods. Metallurgically the orebodies showed amenability to dense media separation and conductivity sorting. The dense media results showed high mass rejections and high metal recoveries for all nine orebodies

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3

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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4

Chang, Xiangning. "Short term sublethal studies in rats exposed to nickel subsulfide and nickel ore : effects on oxidative damage, antioxidant and detoxicating enzymes /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ55491.pdf.

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5

Zhang, Liping. "Hydrodenitrogenation of organonitrogen compounds over nickel-molybdenum sulfide and Molybdenum nitride catalysts /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487942739805674.

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6

Ji, Yijie. "Metal Organic Frameworks Derived Nickel Sulfide/Graphene Composite for Lithium-Sulfur Batteries." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron152233332526446.

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7

Tong, Libin. "Sulfur dispersing agents for nickel sulfide leaching above the melting point of sulfur." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/3427.

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The effects of sulfur dispersing agents (SDAs) in the oxygen pressure leaching of nickel concentrate at medium temperature were investigated. Liquid sulfur-aqueous solution interfacial tensions and liquid sulfur-sulfide mineral contact angles were measured at 140ºC, 690 kPa overpressure by nitrogen, and 1.0 mol/L NiSO₄. The effects of SDAs including lignosulfonate, Quebracho, o-phenylenediamine (OPD), and humic acid were evaluated by the calculation of the work of adhesion in the liquid sulfur-sulfide mineral-aqueous solution systems. It was found that the sulfide mineral surface is sulfophobi

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8

Pillay, Keshree. "Mineralogical effects on the dense medium separation of low grade nickel sulfide ore." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/13751.

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Dense medium separation (DMS) is a method often used to upgrade base metal sulfide (BMS) ores before their main processing stage, with varying results achieved for different ore types. The process makes use of the density differences between the BMS minerals and the lower density silicate/carbonate gangue minerals, using a separating medium of density between the two ore components. The separation is accelerated using a dense medium cyclone (DMC) to form two products: overflow (tailings) and underflow (concentrate). The purpose of DMS is to reject large quantities of gangue upfront, resulting

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9

Franchuk, Anatoliy. "HIGH TENOR NI-PGE SULFIDE MINERALIZATION OF THE SOUTH MANASAN ULTRAMAFIC INTRUSION, THOMPSON NICKEL BELT, MANITOBA." Thesis, Laurentian University of Sudbury, 2014. https://zone.biblio.laurentian.ca/dspace/handle/10219/2195.

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The South Manasan ultramafic intrusion (ca. 1880 Ma) located in the Early Proterozoic Thompson Nickel Belt (TNB) contains Ni and platinum group element (PGE) mineralization hosted by disseminated sulfide. Whole-rock Ni values range from 0.3 to 1.7 wt. % and total precious metals (TPMs) range from 0 to 1.3 ppm Pt + Pd + Au and equate to tenor values (i.e., metal in 100% sulfide) of 11-39 wt. % Ni and 8-27 ppm TPMs. The South Manasan intrusion is a steeply dipping sill-like body with a boudinaged outline having a strike length of approximately 1200 m, average width of 125 m and a minimum depth e

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10

Kilickaplan, Isil. "Effect of pulp rheology on flotation : the nickel sulfide ore with asbestos gangue system." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12765.

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Pulp rheology is a sensitive indicator of the state of aggregation/dispersion of mineral particles. In this study, possible correlation between the rheological properties of flotation pulp and the flotation response was investigated through a series of rheological and batch flotation tests. The nickel-sulfide ore from the Mt. Keith plant (Western Australia) was used for the tests. It is a low-grade nickel sulfide ore which is characterized by complex mineralogical composition with a large content of serpentine minerals. The experimental program included agglomerate flotation tests and rheolog

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11

Yukna, Jennifer. "Computational and experimental investigations of the structural properties, electronic properties, and applications of silver, gold, mercury selenide, silver sulfide, and nickel sulfide nanoparticles /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1482010021&sid=2&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Thesis (Ph. D.)--Southern Illinois University Carbondale, 2007.<br>"Department of Chemistry and Biochemistry." Keywords: Electronic properties, Silver, Gold, Mercury selenide, Silver sulfide, Nickel sulfide, Nanoparticles. Includes bibliographical references (p. 170-180). Also available online.

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12

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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13

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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14

Lu, Zheng-Ya. "Extraction of copper from copper-iron and copper-nickel-iron sulfide concentrates by a double roast-leach process." Thesis, Lu, Zheng-Ya (1986) Extraction of copper from copper-iron and copper-nickel-iron sulfide concentrates by a double roast-leach process. PhD thesis, Murdoch University, 1986. https://researchrepository.murdoch.edu.au/id/eprint/52722/.

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A fundamental investigation into a double roast-leaeh process to extract copper from sulfide concentrates containing iron and nickel has been undertaken. The double roast-leach process involves three steps: dead roast to remove sulfur from concentrates, segregation roast to produce metallic copper, and a selective leach of copper with acidic Cu(II) sulfate/acetonitrile (AN)/H20 or Cu(II) chloride/NaCl/h2O solutions. The first part of this work investigates the application of the double roast-leach process for -the recovery of copper from copper-iron and copper-nickel-iron sulfides under a

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15

Khan, Feroze. "Effect of Hydrogen Sulfide in Landfill Gas on Anode Poisoning of Solid Oxide Fuel Cells." Youngstown State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1338838003.

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16

Becker, Megan. "The mineralogy and crystallography of pyrrhotite from selected nickel and PGE ore deposits and its effect on flotation performance." Thesis, Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-09272009-100136/.

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17

Francis, Jérémy. "Vers un design orienté de nouveaux catalyseurs zéolithiques sélectifs pour l'hydrocraquage." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10013.

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L’emploi de cristaux de zéolithe USY comme fonction acide et de phases sulfures de type NiMoS comme fonction hydro/deshydrogénante (H/DH) dispersée sur un liant de type alumine [NiMoS/(_-Al2O3 + USY)] permet l'obtention de catalyseurs bifonctionnels d’hydrocraquage très actifs mais dont la sélectivité en distillats moyens est relativement faible. Une des causes invoquées pour expliquer ces performances est la distance importante entre les sites H/DH et les sites acides qui entraine des réactions secondaires et la formation de produits légers. Dans ce travail, une phase H/DH additionnelle (nick

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18

Oliveira, Diogo Padilha, and 92981837414. "Síntese hidrotermal do sulfeto de níquel/carbono para aplicação em supercapacitores." Universidade Federal do Amazonas, 2018. https://tede.ufam.edu.br/handle/tede/6586.

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Submitted by Diogo Oliveira (diogo_dpo@hotmail.com) on 2018-09-11T19:27:30Z No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação - Diogo Padilha Oliveira.pdf: 2087027 bytes, checksum: dce925c5d03b977ea55d48f64a89b36c (MD5) Carta de Encaminhamento para Autodepósito.pdf: 1300274 bytes, checksum: bc86221770e14a2d384060440c52b343 (MD5) Ata de Defesa Pública.pdf: 1062842 bytes, checksum: 30613942cf00a0bcfda46d50a69d6af4 (MD5)<br>Approved for entry into archive by PPGCEM Ciência e Engenharia de Materiais (ppgcem@ufam.edu.br) on 2018-09-11T19:42

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19

Zhang, Jian, Tao Wang, Darius Pohl, et al. "Interface Engineering of MoS2/Ni3S2 Heterostructures for Highly Enhanced Electrochemical Overall Water Splitting Activity." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235457.

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To achieve sustainable production of H2 fuel through water splitting, low-cost electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are required to replace Pt and IrO2 catalysts. Here, for the first time, we present the interface engineering of novel MoS2/Ni3S2 heterostructures, in which abundant interfaces are formed. For OER, such MoS2/Ni3S2 heterostructures show an extremely low overpotential of ~218 mV at 10 mA cm-2, which is superior to that of the state-of-the-art OER electrocatalysts. Using MoS2/Ni3S2 heterostructures as bifunctional electrocatalyst

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20

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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21

Zindine, El Mostafa. "Etude de la résistance à la corrosion de quelques métaux et alliages susceptibles d'être utilisés en connectique sans traitement de surface préalable." Besançon, 1987. http://www.theses.fr/1987BESA2029.

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Etude du comportement mecanique et de la resistance a la corrosion de certains metaux et alliages susceptibles d'etre utilises pour la fabrication de connecteurs sans revetement protecteur. Des alliages a base de nickel, a base de cuivre et a base de cobalt ont ete testes dans des milieux d'essais industriels (h::(2)s et/ou h::(2)s+so::(2)). La nature des produits de corrosion formes ete analysee par reduction electrochimique, diffraction des rx, microsonde de castaing et spectrometrie xps. Les resultats ont ete compares avec ceux obtenus par polarisation des echantillons dans une solution aqu

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22

Chamberlain, Anthony C. "The effect of stoichiometry on the thermal behaviour of synthetic iron-nickel sulfides." Thesis, Curtin University, 1996. http://hdl.handle.net/20.500.11937/2602.

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The effect of stoichiometry on the pyrolytic decomposition, oxidation and ignition behaviour of synthetic violarite and pentlandite has been established. These minerals, of general formula (Fe,Ni)(subscript)3S(subscript)4 and (Fe,Ni)(subscript)9S(subscript)8 respectively, may vary considerably in Fe:Ni ratio. Pentlandite can also show some variation in metal:sulfur ratio. A series of samples, ranging in stoichiometry from Fe(subscript)0.96Ni(subscript)1.97S(subscript)4 to Fe(subscript)0.20Ni(subscript)2.72S(subscript)4 and Fe(subscript)5.80Ni(subscript)3.15S(subscript)8 to Fe(subscript)3.40Ni(

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23

Carvalho, Luciana Batista de. "Autoxidação dos complexos de tetra, penta e hexaglicina de Ni(II), Co(II) e Cu(II) induzida por S(IV). Determinação de S(IV) e aldeídos por quimiluminescência." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-30032007-153520/.

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A autoxidação dos complexos de Ni(II) e Co(II) com tetra, penta e hexaglicina, em meio de tampão borato, é acelerada por espécies de enxofre (IV) (H2S0<SUB3, HS03-e SO32-). A formação dos complexos de Ni(III) e Co(III) foi acompanhada espectrofotometricamente em 325 e 265 nm, respectivamente. A velocidade da reação de autoxidação do complexo de Ni(II)/Gn aumenta com a concentração de S(IV) e é máxima em pH Ξ8,5. O processo é autocatalítico com Ni(III)ou Co(III)atuando como iniciadores, forma~os pela oxidação espontânea de Ni(II) ou Co(II) pelo oxigênio molecular. A dependência da constant

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24

Chamberlain, Anthony C. "The effect of stoichiometry on the thermal behaviour of synthetic iron-nickel sulfides." Curtin University of Technology, Department of Applied Chemistry, 1996. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=11365.

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The effect of stoichiometry on the pyrolytic decomposition, oxidation and ignition behaviour of synthetic violarite and pentlandite has been established. These minerals, of general formula (Fe,Ni)(subscript)3S(subscript)4 and (Fe,Ni)(subscript)9S(subscript)8 respectively, may vary considerably in Fe:Ni ratio. Pentlandite can also show some variation in metal:sulfur ratio. A series of samples, ranging in stoichiometry from Fe(subscript)0.96Ni(subscript)1.97S(subscript)4 to Fe(subscript)0.20Ni(subscript)2.72S(subscript)4 and Fe(subscript)5.80Ni(subscript)3.15S(subscript)8 to Fe(subscript)3.40Ni(

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25

ARROUIJAL, FATIMA-ZOHRA. "Etude de la transformation biologique et des proprietes genotoxiques et immunotoxiques du sous-sulfure de nickel (alpha ni3s2)." Lille 2, 1991. http://www.theses.fr/1991LIL2T006.

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26

Zuo, Donghua. "Etude des propriétés de catalyseurs à base de sulfure de nickel et de tungstène." Lyon 1, 2003. http://www.theses.fr/2003LYO10039.

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Les spécifications environnementales concernant la teneur en soufre contenue dans les gazoles ne cessent de se durcir (500 ppm en 1996, 50 ppm en 2005). Ces nouvelles normes expliquent pourquoi l'hydrodésulfuration catalytique (HDS) est un procédé du raffinage en pleine évolution et pour lequel la recherche de nouveaux catalyseurs basées sur de nouvelles phases actives ou de nouveaux supports suscite de nombreux efforts de recherche. L'objectif de ce travail est l'étude de catalyseurs à base de sulfure de tungstène WS2 en portant particulièrement attention à l'effet du promoteur nickel et à l'

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27

Mbedzi, Ndishavhelafhi. "Impurity control by precipitation in synthetic atmospheric nickel laterite sulfate leach solutions." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/81508.

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In light of fast depleting nickel sulfide ore reserves and increasing demand for nickel, the future of the nickel industry lies in the hydrometallurgical processing of the relatively abundant low-grade nickel laterite ores. The purification of the leach solutions, however, has proven difficult. Hydroxide and oxidative precipitation processes using a variety of reagents were developed for processing synthetic sulfate solutions simulating nickel laterite leach solutions and nickel and cobalt solutions following iron precipitation process.

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28

Ikogou, Maya Devi. "Etude des processus de biominéralisation des sulfures de fer et des mécanismes de piégeage du nickel : contexte des sédiments de mangrove de Nouvelle-Calédonie." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066705/document.

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Ces travaux de thèse avaient pour objectifs (i) d’étudier le comportement du fer et du nickel au cours de la biominéralisation de sulfures de fer par des bactéries sulfato-réductrices et (ii) de tenter une première estimation de l’influence de l’exploitation minière sur les communautés microbiennes des sédiments de mangrove de Nouvelle-Calédonie. Pour atteindre ces objectifs, des expériences d’incubation ont été conduites en anoxie avec une espèce unique de bactérie (thio)sulfato-réductrice (i.e. Desulfovibrio capillatus) et avec un consortium de bactéries sulfato-réductrices natives de sédime

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29

Barbaroux, Romain. "Développement d'un procédé hydrométallurgique de récupération du nickel." Thesis, Vandoeuvre-les-Nancy, INPL, 2010. http://www.theses.fr/2010INPL087N/document.

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Cette recherche s’inscrit dans le contexte de la conception d’une filière originale comprenant la phytoextraction du nickel par la plante hyperaccumulatrice Alyssum murale, endémique des sols de serpentine d’Albanie et de sa valorisation de ce nickel, l’objectif étant d’arriver à un produit à haute valeur ajoutée. Les sols de serpentine peuvent être considérés comme une ressource secondaire. Ils contiennent des concentrations élevées en nickel mais à des teneurs insuffisantes pour être exploités par l’industrie minière. La plante Alyssum murale peut extraire et concentrer le nickel dans ses ti

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30

Lakhdar, Mahjoub. "Application de la reaction d'hydrodesazotation de la pyridine a la caracterisation de l'activite et de la selectivite de catalyseurs sulfures." Caen, 1987. http://www.theses.fr/1987CAEN2021.

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31

Zhang, Xin. "Procédé hydrométallurgique pour la valorisation du nickel contenu dans les plantes hyperaccumulatrices." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0172/document.

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Certaines plantes, dites hyperaccumulatrices, ont la capacité de se développer sur des sols riches en métaux et d’accumuler ces métaux à des concentrations élevées. L’incinération de la biomasse produit des cendres qui contiennent de 10 à 25% en masse de Ni. Ce travail s’inscrit dans la continuité d’une recherche menée par l’équipe depuis plusieurs années, qui a donné lieu notamment à un brevet sur la production du sel double sulfate de nickel et d’ammonium hexahydraté (ANSH) à partir de la biomasse d’Alyssum murale. Le manuscrit comprend d’abord une synthèse bibliographique sur la phytomine,

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32

Jiang, Nan. "First-Row Transition Metal Sulfides and Phosphides as Competent Electrocatalysts for Water Splitting." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6480.

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Conversion of renewable energy resources (such as solar and wind) through water splitting to hydrogen and oxygen has attracted increasing attention. The sole product of hydrogen combustion is water, rendering a carbon-neutral energy cycle. Water splitting consists of two redox half reactions: hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Both of these two transformations involve multi- electron/proton movement and thus are kinetically sluggish. In order to accelerate the reaction rates for practical application, efficient catalysts are needed. State-of-the-art catalyst

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33

Hantzer, Sylvain. "Nouveaux materiaux pour la reaction d'hydrodesulfuration (hds)." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13120.

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Nouveau modele de phase active obtenu par interpretation des resultats de rmn du **(59)co et de microscopie electronique haute resolution pour des catalyseurs d'hydrotraitement a base de sulfure de molybdene et de cobalt. Application a d'autres systemes : nire, core, rhre et rhmo. Etude de l'empoisonnement par la porphyrine de catalyseur nimo/al::(2)o::(3)

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34

Nhut, Jean-Mario. "Réaction d'oxydation sélective de l'hydrogène sulfuré (H2S) en soufre élémentaire." Université Louis Pasteur (Strasbourg) (1971-2008), 2003. http://www.theses.fr/2003STR13240.

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Les travaux réalisés sur la réaction de désulfuration à haute température ont permis de contrôler sélectivement la localisation de la phase active par rapport au support, grâce à la mise au point d'une nouvelle méthode d'imprégnation (appelée imprégnation bi-phasique). Cette méthode est basée sur les propriétés de dualité de surface du SiC (hydrophile, hydrophobe), et permet de déposer les particules d'oxyde de fer (phase active) exclusivement sur les zones purement SiC de nature hydrophobe, qui s'avèrent être localisées à l'extérieur des pores du matériau et permettent une meilleure accessibi

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35

Ikogou, Maya Devi. "Etude des processus de biominéralisation des sulfures de fer et des mécanismes de piégeage du nickel : contexte des sédiments de mangrove de Nouvelle-Calédonie." Electronic Thesis or Diss., Paris 6, 2016. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2016PA066705.pdf.

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Ces travaux de thèse avaient pour objectifs (i) d’étudier le comportement du fer et du nickel au cours de la biominéralisation de sulfures de fer par des bactéries sulfato-réductrices et (ii) de tenter une première estimation de l’influence de l’exploitation minière sur les communautés microbiennes des sédiments de mangrove de Nouvelle-Calédonie. Pour atteindre ces objectifs, des expériences d’incubation ont été conduites en anoxie avec une espèce unique de bactérie (thio)sulfato-réductrice (i.e. Desulfovibrio capillatus) et avec un consortium de bactéries sulfato-réductrices natives de sédime

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36

Mijoin, Jérôme. "Transformation de dérivés carbonylés sur catalyseurs à base de sulfure de molybdène ; contribution à la compréhension de l'effet des promoteurs et application à la synthèse de thiols." Poitiers, 1999. http://www.theses.fr/1999POIT2351.

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La transformation de derives carbonyles sur catalyseurs a base de sulfure de molybdene promu ou non par le cobalt ou le nickel a ete realisee en phase gazeuse a 220\c et a pression atmospherique en presence d'un melange h 2s/h 2. La molecule modele utilisee, la cyclopentanone, se transforme selectivement en cyclopentanethiol avec de bons rendements. Le schema reactionnel determine a revele la presence d'un intermediaire thiocetonique, et la formation parallele de produits de condensation ainsi que d'olefines provenant principalement de la deshydrosulfuration du thiol. L'application de cette re

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37

Schoeman, Liezl. "Evaluation of polarisation parameters as predictor of morphology of nickel electrodeposits produced from sulfate electrolyte." Thesis, University of Pretoria, 2018. http://hdl.handle.net/2263/66022.

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Industrial electrowinning of nickel requires specific control and optimisation of the electrolyte composition, the presence of impurities, the addition of additives (to achieve particular deposit properties) and the operating parameters (such as pH and temperature) in order to produce electroplated nickel of high quality and desirable morphological characteristics. Without understanding and strict control of the electrocrystallisation process, nickel can delaminate due to internal strain, frequent pitting of the deposit can occur, current efficiency can decrease significantly or dendritic grow

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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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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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Brémaud, Mickaël. "Etude du mode d'action des catalyseurs à base de sulfure de molybdène par échange isotopique (H-D) et par hydrogénation d'oléfines." Poitiers, 2003. http://www.theses.fr/2003POIT2350.

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Romero, Perez Yilda. "Hydrodésoxygenation de composés phénoliques modèles représentatifs d'une bio-huile issue de matières lignocellulosiques sur catalyseurs sulfures promus (NiMo/Al2O3 et CoMo/Al2O3) et non-promu (Mo/Al2O3)." Poitiers, 2010. http://theses.edel.univ-poitiers.fr/theses/2010/Romero-Perez-Yilda/2010-Romero-Perez-Yilda-These.pdf.

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La valorisation de la biomasse lignocellulosique comme source alternative pour la production de carburants de type gazole impose le développement de procédés spécifiques pour les traitements des bio-huiles issues de sa transformation. Pour atteindre les nouvelles directives européennes sur l'utilisation de ces nouveaux types de biocarburants, il est nécessaire d'éliminer l'oxygène de ces bio-huiles par un procédé d'hydrodésoxygénation. Les performances de trois catalyseurs sulfures ((Co,Ni)Mo/Al2O3) sur la transformation de composés phénoliques modèles (phénol, 2-éthylphénol et 4-éthylphénol)

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Ben, Tayeb-Meziane Karima. "Voies de préparation innovantes pour les catalyseurs d’hydrocraquage nickel-tungstène supportés : intérêt de l’utilisation de précurseurs hétéropolyanioniques." Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10155/document.

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Le développement de la phase hydro-déshydrogénante pour la préparation de catalyseurs d’hydrocraquage innovants et plus performants est nécessaire pour l’évolution du marché des carburants orienté vers une production maximale en produits légers (gazole, kérosène) moins polluants. Les catalyseurs actuellement utilisés sont du type NiW/SiAl (solution de métatungstate d’ammonium et de nitrate de nickel déposée sur une silice-alumine). Ce travail propose une nouvelle méthode de synthèse de ces solides. Nous avons préparé des catalyseurs d’hydrocraquage à partir de sels d’hétéropolyanions à structu

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Sanches, Carlos Vinícius [UNESP]. "Disponibilidade de Ni em um latossolo vermelho distrófico em função da aplicação de gesso agrícola e caracterização fisiológica e bioquímica do algodoeiro." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151924.

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Submitted by Carlos Vinícius Sanches null (carlos01267@aluno.feis.unesp.br) on 2017-10-16T23:04:13Z No. of bitstreams: 1 Carlos Vinicius Sanches.pdf: 1153134 bytes, checksum: e1a87166456fa7557998258f42005db3 (MD5)<br>Approved for entry into archive by Monique Sasaki (sayumi_sasaki@hotmail.com) on 2017-10-18T18:46:06Z (GMT) No. of bitstreams: 1 sanches_cv_me_ilha.pdf: 1153134 bytes, checksum: e1a87166456fa7557998258f42005db3 (MD5)<br>Made available in DSpace on 2017-10-18T18:46:06Z (GMT). No. of bitstreams: 1 sanches_cv_me_ilha.pdf: 1153134 bytes, checksum: e1a87166456fa7557998258f42005db3

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Zakaria, Siti Nurul Azian binti. "Insight into the surface structure of iron (-nickel) sulfides in aqueous environments for CO2 reduction applications using in-situ spectroelectrochemistry." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/10039695/.

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Iron sulfides and iron nickel sulfides, specifically greigite, (Fe3S4), and violarite, (FeNi2S4), have been shown to reduce CO2 on application of low electrode potentials (up to −1.3 V vs AgCl|Ag). However, at such low potentials, metal sulfides are predicted to undergo reductive decomposition and competing reactions such as water reduction may also take place. The aim of the work in this thesis was to determine the stability of the iron (-nickel) sulfides under conditions where CO2 reduction has been demonstrated to take place. In-situ Attenuated Total Reflectance Fourier Transformed Infrared

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Bernardon, Guillaume. "Hydrodésoxygénation de molécules modèles sur catalyseur sulfures de nickel et de molybdène déposés sur alumine." Poitiers, 1996. http://www.theses.fr/1996POIT2331.

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L'objectif general de ce travail etait d'examiner la possibilite d'introduire les huiles de pyrolyse de la biomasse dans les charges des unites d'hydrotraitement. Il fallait donc savoir s'il etait possible de convertir des molecules oxygenees dans les conditions de l'hydrotraitement sur le meme type de catalyseur et en presence de molecules caracteristiques des charges a hydrotraiter, notamment les molecules azotees. Cette etude a donc porte sur la transformation de molecules oxygenees modeles, et plus particulierement le benzofuranne, dans des conditions proches de la realite industrielle (re

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Roebuck, James William. "Reagents for selective extraction of nickel(II), cobalt(II) and copper(II) from highly acidic sulfate feeds containing iron." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/17976.

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This thesis focuses on development of new regents which are suitable for recovering nickel, cobalt and copper from laterite leach solutions, specifically focusing on reagent requirements for novel base metal flowsheets developed by Anglo American. The work aims to design reagents which can extract nickel(II), cobalt(II) and copper(II) from a highly acidic aqueous sulfate solutions whilst showing selectivity over iron(II) and iron(III). Chapter 1 reviews current extractive metallurgy processes for separating and concentrating metals in laterite ores and describes new flowsheets proposed by Angl

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Shirali, Pirouz. "Etude in vitro de la toxicite du sous-sulfure de nickel (ni3s2) sur cellules pulmonaires : consequences sur la fluidite membranaire et la peroxydation lipidique." Lille 2, 1992. http://www.theses.fr/1992LIL2P252.

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Mennour, Ammar. "Caracterisation par spectroscopie infrarouge d'alumines modifiees et de catalyseurs w(mo) - ni(co) sulfures supportes sur alumine." Caen, 1987. http://www.theses.fr/1987CAEN2019.

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Sanches, Carlos Vinícius. "Disponibilidade de Ni em um latossolo vermelho distrófico em função da aplicação de gesso agrícola e caracterização fisiológica e bioquímica do algodoeiro /." Ilha Solteira, 2017. http://hdl.handle.net/11449/151924.

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Orientador: Enes Furlani Junior<br>Resumo: O algodoeiro apresenta uma sensibilidade elevada nos sistemas de cultivo. A acidez do solo aliada a alta concentração alumínio e a baixa disponibilidade de cálcio em profundidade podem limitar a produtividade sendo possível verificar distúrbios nutricionais. Nesse contexto, o níquel, nutriente essencial, componente da metaloenzima urease tem sua importância comprovada no metabolismo do nitrogênio e vem sendo estudado como alternativa para melhorar a qualidade do sistema de cultivo por meio da eficiência do uso do nitrogênio disponível. Outra vertente

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Zahir, Najate. "Activités en hydrodésazotation et caractérisations de catalyseurs sulfures à base de molybdène et de nickel." Lyon 1, 1987. http://www.theses.fr/1987LYO11738.

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