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Gotowa bibliografia na temat „Nickel-sulphide”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 31 lipca 2024

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Artykuły w czasopismach na temat "Nickel-sulphide"

Harris, C. T., C. A. Pickles i J. G. Peacey. "A Thermodynamic Analysis of the Selective Sulphidation of Nickel from a Nickeliferous Lateritic Ore". High Temperature Materials and Processes 31, nr 4-5 (30.10.2012): 603–11. http://dx.doi.org/10.1515/htmp-2012-0098.

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AbstractThe production of a nickel sulphide concentrate through selective sulphidation of a nickeliferous lateritic ore at temperatures lower than current smelting temperatures, is being studied as a potential production method for upgrading lateritic ores. The ability to produce such a nickel sulphide concentrate at economically attractive grades, while achieving reasonable nickel recoveries, relies on the conversion of the maximum amount of nickel oxide to sulphide, while minimizing the amount of iron sulphide. This paper examines the thermodynamic basis for this selective sulphidation. The analysis includes both pure component equilibrium as well as various solid and liquid solution phases, which are anticipated to set limits on the maximum achievable grade/recovery combinations. Thermodynamic calculations show that, for high iron limonitic ores, grades of up to 20 to 25 mass percent nickel should be possible, while maintaining recoveries of greater than 80 percent.

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Bielecki, S., Manuela Reben i Jan Wasylak. "Nickel Sulphide Inclusions in Tempered Glass". Advanced Materials Research 39-40 (kwiecień 2008): 563–66. http://dx.doi.org/10.4028/www.scientific.net/amr.39-40.563.

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The goal of the work was to determine and characterize the inclusions of nickel sulphide in tempered glass. During the tempering process where the glass is heated the nickel sulphide stones are completed transformed to the high temperature modification which is unstable when the temperature decreased. The glass samples, which include the NiS stones, were investigated by microscopic method (SEM) and characterized by EDAX analysis. The glass samples were analysis by elastooptic studies but it did not prove occurrence of stresses. Obtained results will help to solve the problem with forming nickel sulphide inclusions.

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Smoła, G., A. Poczekajło i Z. Grzesik. "Reduction Kinetics Of NiS Sulphide". Archives of Metallurgy and Materials 60, nr 2 (1.06.2015): 981–83. http://dx.doi.org/10.1515/amm-2015-0245.

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Abstract Reduction mechanism and kinetics of NiS nickel sulphide obtained during the process of nickel sulphidation, have been studied as a function of temperature (723-873 K). It has been found that the reduction process follows linear kinetics with activation energy of 103 kJ/mol. It is important to note that during nickel sulphidation and after the reduction of nickel sulphide, the product sample shows highly developed surface, creating thus the potential possibilities to be applied in heterogeneous catalysis.

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Afolabi, Ayo Samuel, Ambali Saka Abdulkareem i Edison Muzenda. "Effect of Flotation Parameters on Recovery of South Africa Nickel Sulphide Ore". Applied Mechanics and Materials 260-261 (grudzień 2012): 961–68. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.961.

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This study investigated the effects of flotation parameters on the recovery of low grade nickel sulphide ore. The parameters investigated are the particle size, flotation time, temperature and pH of the pulp. The analyses of the results obtained showed that particle size, pH, and flotation time had significant effects on the recovery of nickel sulphide ore. The particle size distribution showed that the breakage rate increased in coarse particles and decreased with reduction in particle size. The optimum particle size was found to be 87% passing 75 µm with the highest nickel recovery of 35% at 15 minutes while 68, 79, and 97% passing 75 µm produced nickel recovery of 15, 20 and 16% respectively. The maximum nickel recovery of 35% was achieved at pH of 10.5 which indicated that the nickel sulphide ore has good floatability at alkaline pH range. It was also observed that the recovery of nickel increased with flotation time and the highest recovery was obtained at flotation time of 15 minutes.

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Eddy, Basil T., Belinda L. Stuckenberg i Gemot Pansi. "X-ray Fluorescence and Fire-Assay Collection: Useful Partners in the Determination of the Platinum-Group Elements". Advances in X-ray Analysis 34 (1990): 277–83. http://dx.doi.org/10.1154/s0376030800014567.

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AbstractThis paper describes the determination of the individual platinum-group elements by X-ray fluorescence after nickel-sulphide fire-assay collection. The platinum-group sulphide residue obtained after the dissolution of the nickel is dissolved in acid, and reduced to the metal by use of sodium borohydride. The finely divided metals are then filtered onto a millipore filter, and measured by X-ray fluorescence spectroscopy. The procedure makes use of gold as an internal standard. Factors affecting the accuracy and precision are investigated.

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Bogatyrev, D. M., G. V. Petrov i L. B. Tsymbulov. "Distribution of noble metals between slag and matte phases during smelting of copper-sulphide and copper-nickel concentrates". iPolytech Journal 26, nr 1 (5.04.2022): 128–41. http://dx.doi.org/10.21285/1814-3520-2022-1-128-141.

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In this work, we analyse and structure the information on the distribution of noble metals during pyrometallurgical processing of copper-sulphide and copper-nickel concentrates, available in domestic and foreign scientific sources. The data on the influence of oxygen partial pressure in the system and, consequently, the matte composition, process temperature, and the phase composition of slag on the distribution of platinum group metals, gold, and silver between the smelting products were analysed. Broad-ranging information on the distribution of the examined metals between matte and slag in the processing of copper-sulphide and copper-nickel concentrates was studied. It was established that the distribution of noble metals between the products of smelting using modern analytical methods is still in its early stages. Contradictory information on the behaviour of gold, silver, and platinum group metals during the pyrometallurgical processing of copper-sulphide and copper-nickel concentrates is presented in literature due to the variations in the experimental procedures, preparation, and analysis of test samples, and, as a result, further interpretation of the obtained results. Furthermore, no data on the influence of such technological parameters as magnetite content in the slag phase, the relationship between copper and nickel in the initial furnace charge and obtained mattes on the distribution of gold, silver, and platinum group metals between the products of smelting are available. In addition, no information on the distribution of noble metals during the pyrometallurgical slags depletion obtained in oxidative smelting of copper-nickel production has been published. Thus, it was decided to perform further research on establishing optimal technological conditions for oxidising smelting of copper-sulphide and copper-nickel concentrates, as well as pyrometallurgical depletion of slags, allowing for the highest extraction rates of noble metals into the target product.

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Himstedt, Rasmus, Dominik Hinrichs, Joachim Sann, Anica Weller, Georg Steinhauser i Dirk Dorfs. "Halide ion influence on the formation of nickel nanoparticles and their conversion into hollow nickel phosphide and sulphide nanocrystals". Nanoscale 11, nr 32 (2019): 15104–11. http://dx.doi.org/10.1039/c9nr04187g.

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Elliott, R., i C. A. Pickles. "Thermodynamic Analysis of the Selective Reduction of a Nickeliferous Limonitic Laterite Ore by Hydrogen". High Temperature Materials and Processes 36, nr 8 (26.09.2017): 835–46. http://dx.doi.org/10.1515/htmp-2015-0208.

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AbstractNickeliferous limonitic laterite ores are becoming increasingly attractive as a source of metallic nickel as the costs associated with recovering nickel from the sulphide ores increase. Unlike the sulphide ores, however, the laterite ores are not amenable to concentration by conventional mineral processing techniques such as froth flotation. One potential concentrating method would be the pyrometallurgical solid state reduction of the nickeliferous limonitic ores at relatively low temperatures, followed by beneficiation via magnetic separation. A number of reductants can be utilized in the reduction step, and in this research, a thermodynamic model has been developed to investigate the reduction of a nickeliferous limonitic laterite by hydrogen. The nickel recovery to the ferronickel phase was predicted to be greater than 95 % at temperatures of 673–873 K. Reductant additions above the stoichiometric requirement resulted in high recoveries over a wider temperature range, but the nickel grade of the ferronickel decreased.

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Kungurova, V. Ye, Yu P. Trukhin i V. A. Stepanov. "Sulphide copper-nickel ore occurrence Olenie (Kamchatka)". Mining Informational and analytical bulletin 12, nr 57 (2018): 122–33. http://dx.doi.org/10.25018/0236-1493-2018-12-57-122-133.

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Smits, R. G., B. F. Schaefer i S. W. Beresford. "Geochemical characteristics of orogenic nickel sulphide deposits". Geochimica et Cosmochimica Acta 70, nr 18 (sierpień 2006): A600. http://dx.doi.org/10.1016/j.gca.2006.06.1115.

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Rozprawy doktorskie na temat "Nickel-sulphide"

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 matrix to disseminated, and is nearly always concentrated at the base of the host unit. Primary ores have a relatively simple mineralogy, dominated by pyrrhotite-pentlandite-pyrite, and to a lesser degree millerite. Metamorphic grades tend to range from prehnite-pumpellyite facies through to lower and upper amphibolite facies. Genesis of Group I and II deposits is explained by the eruption of komatiites into rift-phase greenstone belts, as channelized flows, which assimilated variable amounts of footwall rocks during emplacement. Sulphide saturation was dependent on the mode of emplacement and, the amount of sulphidic sediments that became assimilated prior to crystallization. This possibly accounts for variations in ore tenor. The Six Mile Deposit (SMD) in Western Australia, is an adcumulate body of the Group IIB-type, exhibiting disseminated mineralization. The ore has been "upgraded" due to hydration and serpentinization. A profound weathering sequence exists, which was subsequently utilized during initial exploration. Exploration techniques has been focused on Western Australia, as it is here that the most innovative ideas have emerged.

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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 processing difficult with conventional pyro- and biohydrometallurgical techniques. The work with this ore has two equally important objectives: to minimize magnesium mobilization and to obtain an acceptable level of nickel extraction. Batch stirred-tank bioleaching experiments were conducted with finely ground ore ( 147 µm) with temperature and pH control. The first phase of experimentation examined the effect of pH (2 to 6) at 30 °C, and the second phase examined all combinations of three pH levels (3, 4 and 5) and five temperatures (5, 15, 22.5, 30, and 45 °C).

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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. When the nickel flotation feed was sampled and tested in laboratory scale, most of the liberated nickel sulphides were recovered. On the contrary, when the industrial nickel tailing was re-floated in laboratory, most of these nickel sulphides were not recovered. In this work, laboratory tests were performed on the ore to investigate the effect of oxygen depleted gas in nickel circuit recovery. Mechanical surface cleaning and slimes dispersion with dispersant addition before the nickel stage were also tested.Pure nitrogen gas flotation results proved that zero oxygen activity is detrimental for sulphides recovery during the nickel stage. The 5% oxygen gas achieved higher nickel recovery and selectivity than air flotation. Most of the pentlandite lost in the tailings of air and depleted oxygen gas were locked. In the fractions finer than 45 μm, the tailing of air flotation contained more liberated pentlandite than the 5% oxygen gas.Mechanical surface cleaning by short stirred mill applied before the nickel stage improved significantly the nickel recovery of every gas flotation, except for the 5% oxygen gas. When dispersant was added to the standard laboratory flotation, iron slimes were observed in the tailing filtrate.Due to the long residence time and high reactivity of sulphides, excessive surface oxidation is believed to be the major reason of the nickel flotation impairing. Colloidal hydroxide slimes formed during sulphides oxidation may smear on mineral surfaces making them hydrophilic. Consequently, the flotation kinetics are slowed down. Short attrition grinding to clean mineral surfaces, along with dispersant addition to keep dislodge slimes in solution is one remedy. Another solution is applying lower oxygen activity of the flotation gas to decelerate the sulphides oxidation and therefore diminish the colloidal hydroxide slimes presence. The flotation residence time can be dramatically shortened in both cases. Further tests are recommended.

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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.
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 complexes compared to benzimidazole derivatives. The absence of the N-H band and the presence of new C=S bands confirmed that the complexes can be used in the preparation of metal sulphide nanoparticles. Elemental analysis showed that there was a percentage mismatch for the complexes I, III, IV and V. Complexes II and VI calculated percentages were within the limits with the found percentages except for sulphur which was low. The TGA curves decomposed to form a mixture of metal and metal sulphides for complex I, II, III and IV except for complex VI which gave metal sulphide only. All benzimidazole complexes decomposed at higher temperatures and were considered as stable complexes. Lead sulphide (PbS) is an important group IV-VI metal chalcogenide semiconductor. It has a direct narrow band gap of 0.41 eV at 300K and a large excitonic Bohr radius of 18 nm. Lead sulphide absorption band can be tuned to anywhere between near IR to UV (0.4μm) covering the entire visible spectrum, while achieving the quantum confinement region. The synthesis of lead sulphide nanoparticles was conducted by varying the effect of the reaction conditions such as the type of capping agents and temperature. Lead dithiocarbamate complex derived from benzimidazole, [Pb(S2N2C8H5)2] was thermolysed in hexadecylamine (HDA) and trioctylphosphine oxide (TOPO) at different reaction temperatures (140, 160 and 180 °C) to produce HDA and TOPO capped PbS nanoparticles. The nanoparticles were characterized using X-ray diffraction (XRD) for structural analysis, transmission electron microscopy (TEM) for shape and size, Ultraviolet visible (UV/Vis) and Photoluminescence (PL) spectroscopy for optical properties. An increase in temperature gave a decrease in the sizes of the nanoparticles when using the HDA capped lead benzimidazole dithiocarbamate complex. The observed morphology was cubes. TOPO capped lead benzimidazole dithiocarbamate complex gave no specific trend when temperature was varied. A cross-like layer with quasi spherical particles on top was observed at 160 °C. At 180 °C, the cross-like layer decomposed into rods- like materials with quasi spherical particles on top for TOPO capped PbS nanoparticles. For lead 2-methylbenzimidazole [Pb(S2N2C9H7)2] dithiocarbamate complex, TOPO capped PbS produced agglomerated cubic morphology at low temperature but as the temperature was increased agglomerated cylindrical shapes were observed. HDA capped PbS produced polydispersed nanocubes which were increasing in size when the temperature was increased. Nanoparticles displayed a blue shift in band edges with good photoluminescence behaviour which was red shifted from their respective band edges all temperatures and capping agents. XRD confirmed the crystal structure of cubic phase (galena) of PbS at all temperatures except for HDA capped PbS nanoparticles at 140 °C from lead benzimidazole dithiocarbamate complex which confirmed the crystal structure of face-centred cubic phase of PbS nanoparticles. Nickel sulphide has much more complicated phase diagram than cobalt sulfides and iron sulfides. Their chemical composition has many crystalline phases such as α-NiS, β=NiS, NiS2, Ni3S2, Ni3S4, Ni7S6 and Ni9S8. Ni3S2 phase has shown potential as a low-cost counter electrode material in dye sensitised solar cells, while the α-NiS phase has been applied as a cathode Material in lithium-ion batteries. The synthesis of nickel sulphide nanoparticles was done by varying the effect of the reaction conditions such concentration and temperature. Nickel benzimidazole dithiocarbamate [Ni(S2N2C8H5)2] and nickel 2-methylbenzimidazole [Ni (S2N2C9H7)2] dithiocarbamates complexes were thermolysed in hexadecylamine (HDA) at different reaction temperatures (140, 160 and 180 °C) and precursor concentrations (0.30, 0.35 and 0.40 g) to produce HDA capped NiS nanoparticles. It was observed that increasing both temperature and precursor concentration increased the size of the nanoparticles. Anisotropic particles were observed for both complexes when varying precursor concentration and temperature. Nickel benzimidazole dithiocarbamate complex produced stable shapes (spheres and cubes) of nickel sulphide nanoparticles. Nickel 2-methylbenzimidazole dithiocarbamate complex produced a mixture of spheres, cubes, triangles and rods nickel sulphide nanoparticles at all concentrations. But when varying temperature, it only produced that mixture at 160 °C. The optical measurements supported the presence of smaller particles at all temperatures and concentrations. XRD showed the presence of C7OS8 and pure nickel as impurities. However, the crystal structure of cubic Ni3S4 was observed at low temperatures and an introduction of monoclinic NixS6 at high temperature (180 °C) when varying temperature for both complexes. When varying concentration using nickel benzimidazole dithiocarbamate complex, XRD showed the presence of NiSO4.6H2O impurities at high temperatures. At 160 °C a mixture of hexagonal NiS and cubic Ni3S4 was observed. At low temperatures only nickel as a metal was found as an impurity and the crystal structure of cubic Ni3S4 was observed. When nickel 2-methylbenzimidazole complex was used, C7OS8 and pure nickel were found as impurities but the crystal structure of cubic Ni3S4 was observed. Cobalt sulphide (CoS) belongs to the family of group II-IV compounds with considerable potential for application in electronic devices. They have a complex phase diagram and their chemical composition have many phases such as Co4S3, Co9S8, CoS, Co1-xS, Co3S4, Co2S3 and CoS2. The synthesis of cobalt sulphide nanoparticles was conducted by varying the effect of temperature on size and shape of the nanoparticles. Nickel benzimidazole dithiocarbamate, [Ni(S2N2C8H5)2] and nickel 2-methylbenzimidazole [Ni(S2N2C9H7)2] complexes were thermolysed in hexadecylamine (HDA) at different reaction temperatures (140, 160 and 180 °C) to produce HDA capped CoS nanoparticles. Cobalt benzimidazole dithiocarbamate complex produced close to spherical shapes nanoparticles at all temperatures. The images showed that as temperature was increased, the size of the particles decreased. All the main reflection peaks were indexed to face-centred cubic Co3S4 and there were some impurities of C7OS8 at all temperatures. The optical measurements supported the presence of smaller particles at all temperatures. Cobalt 2-methylbenzimidazole dithiocarbamate complex produced big and undefined morphology. The optical properties were also featureless and XRD only showed impurities of C7OS8. The impurity is thought to be generated from a side reaction between benzimidazole and carbon disulphide to give this persistent organic moiety.

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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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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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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).
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 rates of nucleation, leading to the formation of particles with undesirable characteristics. In this thesis, to gain insight on the metal sulphide precipitation of nickel and cobalt from the RES, a simplified model system, consisting of a synthetic NiS04 solution with a concentration of 200ppm Ni2+, was utilised to determine the effect of H2S(g) as a precipitating agent.

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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 data in the literature, several Eh-pH diagrams were constructed for the Fe-Ni-S aqueous system. These were compared with mineralogical evidence obtained from naturally occuring mineral assemblages. A study of the oxidative dissolution of pentlandite by electrochemical techniques was made to clarify the mechanism by which pentlandite is leached in acid FeCl3 solution. The techniques used included: potentiometry, linear sweep cyclic voltammetry, intermittent galvanostatic polarization, chronopotentiometry and chronoamperometry. The products were analysed using scanning electron microscopy, powder X-ray diffraction, electron microprobe analysis, atomic absorption spectroscopy and gravimetric analysis. The fitting of experimental results to a simple electron transfer model via the Sand equation was tested and found to be inappropriate. A mechanism for the oxidative dissolution of pentlandite is postulated. In acid solution, pentlandite decomposes spontaneously, liberating aqueous metal ions and H2S. Under potentiostatic conditions akin to FeC13 leaching, pentlandite is oxidized directly to elemental sulphur, without the formation of any intermediate phases. The lack of formation of violarite indicates that the system is substantially perturbed from equilibrium due to slow solid state diffusion of metal atoms within the sulphur sublattice. The formation of metastable amorphous sulphur as the alternative product is further evidence of this perturbation. The physical properties of the sulphur product layer cause an impediment to mass transport between the bulk aqueous solution and the mineral surface. However, the oxidation involves an intrinsically slow 'electron transfer for the So, Fe2+, Ni2+ / Fe4.5Ni4.5S8 couple which, within the potential range relevant to FeCl3 leaching, is rate determining for an appreciable part of the reaction. The implication for extractive hydrometallurgy is discussed. The use of a convolution transform of voltammetric currents with a (πt)-1/2 function as applied to simple electron transfer is described. In addition, the derivation of a functional form for the treatment of chronoamperometric data is given. These models were applied in the determination of the heterogeneous electrochemical parameters and diffusion coefficients for the FeC13/FeC12 couple in 1M HC1 solution on platinum at 293K, using computer controlled chronoampermetric techniques. The results show quasi-reversible behaviour (at 293K), which implies that electron transfer for this couple would not be rate determining in the leaching of pentlandite.

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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 to estimate undiscovered nickel resources.In the proposed methodology, nickel sulphide deposits are considered realisations of stochastic mineralisation processes and are analysed within the following framework. Komatiites in the Kalgoorlie Terrane constitute the full sample space or the permissive tract. Disjoint, naturally bound individual komatiite bodies that make up the sample space are used as the spatial analysis units. Some komatiite bodies within the sample space contain nickel sulphide deposits (mineralised) and others do not (unmineralised). In this study, the most explored mineralised komatiite bodies constitute local control areas against which nickel resources in the less explored komatiite bodies can be assessed. The concept of local control areas is analogous to the concept of global control areas which are well explored parts of permissive areas for particular deposit types worldwide.Spatial point pattern analyses showed that the spatial distribution of mineralised komatiite bodies within the sample space is clustered. In contrast, nickel sulphide deposits in individual komatiite bodies are either randomly distributed or dispersed, and not clustered. This absence of deposit clustering within individual komatiite bodies indicates that the intensity of the deposit pattern of each komatiite body may be adequately expressed as deposit density (number of deposits per km[superscript]2). In global quantitative resource assessments, regression analysis of the well established power law relationship between deposit density and size of global control areas provides a robust method for estimating the number of deposits.In this study a power law relationship reminiscent of that in global models was found between the sizes of control areas and deposit density. In addition, this study establishes another power law relationship between nickel endowment density (nickel metal per km[superscript]2) and the sizes of control areas. Deposit and endowment density regression models based on the two power laws suggested that, respectively, 59 to 210 (mean 114) nickel sulphide deposits and 3.0 to 10.0 Mt (mean 5.5 Mt) nickel metal remained undiscovered in demonstrably mineralised komatiite bodies within the Kalgoorlie Terrane. More emphasis is placed on endowment density which may be more intrinsic to the Kalgoorlie Terrane than deposit density because deposit counts are confounded by definitional ambiguities emanating from orebody complexities. Thus the spatial pattern of mineral deposits may not coincide with the spatial pattern of mineral endowment as demonstrated by spatial centrographic analyses in this study.To estimate the amount of undiscovered nickel metal in the entire Kalgoorlie Terrane and not just in the demonstrably mineralised komatiite bodies, Zipf’s law was applied. According to Zipf’s law, the size of the largest deposit is twice the size of the second, thrice the size of the third, four times the fourth, and so on. Based on the currently known size of Mt. Keith deposit, the largest nickel sulphide deposit in the Kalgoorlie Terrane, Zipf’s law indicates that the terrane is nearly mature in terms of nickel exploration and contains only about 3.0 Mt nickel metal in undiscovered resources. The collective implication of the regression and Zipf’s law estimates is that in the Kalgoorlie Terrane, no significant nickel resources are likely to be contained in the known komatiites that are presently not demonstrably mineralised. However if, as widely speculated, the actual size of Mt. Keith deposit is about twice the currently known size, Zipf’s law predicts 10.0 Mt nickel metal in undiscovered nickel endowment for the Kalgoorlie Terrane. The additional 7.0 Mt undiscovered nickel metal endowment is attributed to opening up of a new exploration search space through deeper resource delineation, within an otherwise nearly mature terrane.

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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 tectonic setting to that of the majority of the AWB and wider EGS. Detailed subsurface mapping has shown that the footwall to the Cosmos mineralised ultramafic sequence consists of an intricate succession of both fragmental and coherent extrusive lithologies, ranging from basaltic andesites through to rhyolites, plus later-formed felsic and basaltic intrusions. The occurrence of thick sequences of amygdaloidal intermediate lavas intercalated with extensive sequences of dacite lapilli tuff, coupled with the absence of marine sediments or hydrovolcanic products, indicates the succession was formed in a subaerial environment. Chemical composition of the non-ultramafic lithologies is typified by a high-K calc-alkaline to shoshonite signature, indicative of formation in a volcanic arc setting. Assimilation-fractional crystallisation modelling has shown that at least two compositionally distinct sources must be invoked to explain the observed basaltic andesite to rhyolite magma suite. High resolution U-Pb dating of several units within the succession underpins stratigraphic relationships established in the field and indicates that the emplacement of the Cosmos succession took place between ~2736 Ma and ~2653 Ma, making it significantly older and longer-lived than most other greenstone successions within the Kalgoorlie Terrane. Extrusive periodic volcanism spanned ~50 Myrs with three cycles of bimodal intermediate/felsic and ultramafic volcanism occurring between ~2736 Ma and ~2685 Ma. Periodic intrusive activity, related to the local granite plutonism, lasted for a further ~32 Myrs or until ~2653 Ma. The Cosmos succession either represents a separate, older terrane in its own right or it has an autochthonous relationship with the AWB but volcanism initiated much earlier in this region than currently considered. Dating of the Cosmos succession has demonstrated that high-resolution geochronology within individual greenstone successions can be achieved and provides more robust platforms for interpreting the evolution of ancient mineralised volcanic successions. The geochemical affinity of the Cosmos succession indicates a subduction zone was operating in the Kalgoorlie Terrane by ~2736 Ma, much earlier than considered in current regional geodynamic models. The Cosmos volcanic succession provides further evidence that plate tectonics was in operation during the Neoarchaean, contrary to some recently proposed tectonic models.

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Książki na temat "Nickel-sulphide"

Attanasi, E. D. A resource assessment of copper and nickel sulfides within the Mountain View area of the Stillwater Complex, Montana. [Washington]: U.S. G.P.O., 1987.

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Gole, Martin. The refinement of extrusive models for the genesis of nickel deposits: Implications from case studies at Honeymoon Well and the Walter Williams Formation : results of research carried out as MERIWA Project 79 in the CSIRO Division of Exploration Geoscience. East Perth, WA: Minerals and Energy Research Institute of Western Australia, 1990.

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Astafʹev, A. F. Pererabotka v kipi͡a︡shchem sloe poluproduktov nikelevogo proizvodstva. Wyd. 2. Moskva: "Metallurgii͡a︡", 1991.

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Kwateng, David Opoku. A Kinetic study of the dissolution of nickel sulfide in acidfied ferrous sulfate solution iwth a gas mixture of oxygen and sulfur dioxide. Ann Arbor, MI: UMI Dissertation Services, 1992.

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Yu, Xiaoquan. The effect of ultrasound in copper-nickel sulphide flotation. Sudbury, Ont: Laurentian University, School of Graduate Studies, 2005.

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Laffin, Stephen. The use of nickel sulphide in the reduction of chromite under carbon saturation. Sudbury, Ont: Laurentian University, School of Engineering, 1990.

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A, Di︠u︡zhikov O., i Society of Economic Geologists (U.S.), red. Geology and metallogeny of sulfide deposits, Norilʹsk Region U.S.S.R. [Socorro? N.M.]: Society of Economic Geologists, 1992.

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Rohit, Tuteja, i Minerals and Energy Research Institute of Western Australia., red. Studies on column flotation of sulphide ores of Western Australia. East Perth, W.A: Minerals and Energy Research Institute of Western Australia, 1994.

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O'Connell, Gary John. Arsenic activities in molten nickel sulphide. 1993.

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Environmental aspects of nickel production: Sulphide pyrometallurgy and nickel refining. [Ottawa, Ont.]: Minister of Supply and Services Canada, 1987.

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Części książek na temat "Nickel-sulphide"

Bhardwaj, Rekha, Ranjana Jha i Medha Bhushan. "Nano/Microstructures of Nickel Sulphide for Energy Storage and Conversion Devices". W Advanced Nanomaterials, 347–70. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11996-5_12.

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Kumar, Niraj, Swati Priyadarsini, Barada P. Dash, Naresh Kumar Sahoo, Abhishek Tripathi i Prasanta Kumar Sahoo. "One-Step Development of Nanostructured Nickel Sulphide Electrode Material for Supercapacitors". W Lecture Notes in Mechanical Engineering, 517–25. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1080-5_42.

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Wei, Lizhen, Caixiang Yu, Guangshi Li, Xiaolu Xiong, Hongwei Cheng, Qian Xu i Xionggang Lu. "Isothermal Sulphation Roasting of Nickel Sulphide Minerals in a Static Air Atmosphere". W 10th International Symposium on High-Temperature Metallurgical Processing, 221–29. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05955-2_21.

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Mei, Xiaoyong, Hongwei Cheng, Cong Xu, Guangshi Li, Xionggang Lu i Qian Xu. "Mechanism of the Chlorination Roasting of Nickel Sulphide Concentrate with Ammonium Chloride". W 10th International Symposium on High-Temperature Metallurgical Processing, 713–21. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05955-2_67.

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Vahed, A., P. J. Mackey i A. E. M. Warner. "“Around the Nickel World in Eighty Days”: A Virtual Tour of World Nickel Sulphide and Laterite Operations and Technologies". W The Minerals, Metals & Materials Series, 3–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65647-8_1.

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Halim, M. A., S. Kumar, J. Chen, V. I. Lakshmanan, S. DasGupta i J. F. NdoutouMve. "Innovative Solvent Extraction to Produce High-Purity Cobalt and Nickel Sulphates from Sulphide Concentrate". W Proceedings of the 61st Conference of Metallurgists, COM 2022, 787–95. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-17425-4_89.

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Gresham, J. J. "Depositional Environments of Volcanic Peridotite-Associated Nickel Sulphide Deposits with Special Reference to the Kambalda Dome". W Special Publication No. 4 of the Society for Geology Applied to Mineral Deposits, 63–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70902-9_5.

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Parry, S. J., I. W. Sinclair i M. Asif. "Evaluation of the Nickel Sulphide Bead Method of Fire-assay for the Platinum-Group Elements using Neutron Activation Analysis". W Geo-Platinum 87, 21–27. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1353-0_3.

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Hagni, Richard D. "Mineralogy and petrology of the lead-zinc-copper sulphide ores of the Viburnum Trend, southeast Missouri, U.S.A., with special emphasis on the mineralogy and extraction problems connected with cobalt and nickel". W Sulphide deposits—their origin and processing, 73–84. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0809-3_5.

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Abdul, Baseer, Preston Holloway i Jan Smit. "Effect of Arsenic, Antimony, and Bismuth in Co-processing of Copper Sulphide Concentrates and Nickel Laterites in Sherritt’s Chimera Process". W Proceedings of the 62nd Conference of Metallurgists, COM 2023, 71–78. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-38141-6_9.

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Streszczenia konferencji na temat "Nickel-sulphide"

Wolfgram, P. A., i H. C. Golden. "Examples of Nickel Sulphide Detection with Airborne EM". W 64th EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2002. http://dx.doi.org/10.3997/2214-4609-pdb.5.d037.

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Wolfgram, P., i H. Golden. "Examples of Nickel Sulphide Detection with Airborne EM". W 7th SAGA Biennial Technical Meeting and Exhibition. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.143.13.3.

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Nandhini, S., i G. Muralidharan. "Surfactant free nickel sulphide nanoparticles for high capacitance supercapacitors". W DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5029191.

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Pietilä, R., i B. J. Amann. "Geophysical Signature of the Siverswan Nickel Sulphide Deposite, Western Australia". W 61st EAGE Conference and Exhibition. European Association of Geoscientists & Engineers, 1999. http://dx.doi.org/10.3997/2214-4609.201408099.

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Bhardwaj, Rekha, Ranjana Jha, Medha Bhushan i Ajay Kumar. "Hydrothermal synthesis of multiple phase nickel sulphide and their electro-catalytic properties". W ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2020): 5th National e-Conference on Advanced Materials and Radiation Physics. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0052729.

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Li, X., Z. P. Fang, F. L. Ng, L. P. Zhao i L. Zhao. "Inspection and Image Analysis of Nickel Sulphide Inclusions in Toughened Glass Panels". W 2006 9th International Conference on Control, Automation, Robotics and Vision. IEEE, 2006. http://dx.doi.org/10.1109/icarcv.2006.345068.

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Moore, J., A. Rice i S. van Wyk. "Finite Element Modelling of the Formation of Komatiite Hosted Massive- Sulphide Nickel Deposits". W 7th SAGA Biennial Technical Meeting and Exhibition. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.143.6.3.

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R. Selfe, G. "Interpretation and Modelling of VTEM Data in Difficult Circumstances, Bon Accord Nickel-Sulphide Deposit". W 11th SAGA Biennial Technical Meeting and Exhibition. European Association of Geoscientists & Engineers, 2009. http://dx.doi.org/10.3997/2214-4609-pdb.241.selfe_paper1.

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Nandhini, S., T. Rajagopalan i G. Muralidharan. "Copper incorporated nickel sulphide on Ni-foam: Binder-free electrode for high performance supercapacitors". W DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016886.

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Suja, R., i Vijayalakshmi Sanyal. "Spectral analysis of zinc and nickel doped iron sulphide nanomaterials assisted with cationic surfactant". W 7TH NATIONAL CONFERENCE ON HIERARCHICALLY STRUCTURED MATERIALS (NCHSM-2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114588.

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Raporty organizacyjne na temat "Nickel-sulphide"

Eckstrand, O. R. Nickel-copper sulphide. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208042.

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Green, A. H., i D. Maceachern. Towards a Genetic Model For Komatiite - Related Nickel Sulphide Deposits. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132307.

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Paktunc, A. D. Nickel-copper sulphide mineralization associated with the Goodwin Lake intrusion, northern New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/122432.

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Rice, T. D., i H. M. Waldron. Preliminary investigations into small nickel sulphide button preconcentration of platinum group elements, gold, and silver in geological materials. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/193315.

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Rice, T. D. Optimization of the nickel sulphide fire-assay preconcentration procedure for platinum-group elements, gold, and silver in geological materials. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/193285.

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Parry, S. J., i M. Asif. The rapid determination of the platinum group elements and gold with nickel sulphide fire assay and neutron activation analysis (NAA). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/193281.

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