Gotowe bibliografie tematyczne / Sulphides

Gotowa bibliografia na temat „Sulphides”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 30 lipca 2024

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Artykuły w czasopismach na temat "Sulphides"

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Knobloch, Marjan, i Bernd G. Lottermoser. "Infrared Thermography: A Method to Visualise and Analyse Sulphide Oxidation". Minerals 10, nr 11 (22.10.2020): 933. http://dx.doi.org/10.3390/min10110933.

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Environmental testing of sulphidic ores and wastes aims to assess the release of metals and metalloids at acid pH conditions and the samples’ likelihood to produce acid rock drainage (ARD). However, the majority of established ARD tests measure geochemical properties of samples and cannot visualise the exothermic oxidation reactions and their intensity leading to metalliferous drainage in all pH environments. This paper proposes a new protocol to detect and visualise the sulphide oxidation in ores and wastes. Six nearly monomineralic sulphides were crushed, sieved to two size fraction (0.09–4 mm), milled to powder and treated with H2O2. The thermal energy released upon sulphide oxidation was optically detected and temperatures measured using a portable infrared thermographic camera. Based on temperature–time progression curves, the oxidation reactivity of sulphides was derived from high to low: chalcopyrite > arsenopyrite > pyrite > sphalerite > stibnite > galena, which depends on grain size, amount of sulphides and other non-sulphide mineral phases present in the sample material. The study demonstrates that the application of H2O2 to sulphide sample powders and subsequent visualisation of the treated materials using a thermographic camera represents a rapid technique in revealing the presence of oxidising sulphides under all pH conditions.
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Barnes, Sarah-Jane, i A. J. Naldrett. "Variations in platinum group element concentrations in the Alexo mine komatiite, Abitibi greenstone belt, northern Ontario". Geological Magazine 123, nr 5 (wrzesień 1986): 515–24. http://dx.doi.org/10.1017/s001675680003510x.

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AbstractThe noble element (Os, Ir, Ru, Rh, Pt, Pd, Au) patterns from sulphides associated with the komatiites at the Alexo mine show variable degrees of fractionation. Massive sulphides at the contact between underlying intermediate volcanics and overlying komatiites have the least fractionated patterns (Pd/Ir = 44). Net-textured sulphides which immediately overlie the massive sulphides have extremely fractionated noble element patterns (Pd/Ir = 171). The disseminated sulphides in the overlying komatiite exhibit an intermediate degree of fractionation (Pd/Ir = 110). The variations in noble element patterns are complemented by variations in the Ni, Cu and Co concentrations. The massive sulphides are depleted in all three of these elements relative to the net-textured sulphide ore. The disseminated sulphides have intermediate values of Ni and Co, but are enriched in Cu relative to the other two sulphides.Processes that could have affected the composition of the sulphides include: (a) fractionation of monosulphide solid solution (Mss) from a sulphide liquid during initial cooling of the komatiite, and (b) mobilization of Pt, Pd, Au, Cu, Ni and Co from the massive sulphide into footwall veins. A mass balance calculation indicates that the sum of the massive and net-textured sulphide agrees with the disseminated sulphide for all elements except Au. Thus the massive sulphide cannot have lost significant amounts of Pt, Pd, Ni and Co to footwall veins and significant mobilization of these elements does not appear to have occurred. The crystallization of Mss from a sulphide liquid will account for the enrichment of Ir, Os, Ru and Rh in the massive sulphide relative to the net-textured sulphide, and enrichment of Pd, Pt, Au, Co and Ni in the net-textured sulphide relative to the disseminated sulphide.
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Barnes, Sarah-Jane, M. L. Zientek i M. J. Severson. "Ni, Cu, Au, and platinum-group element contents of sulphides associated with intraplate magmatism: a synthesis". Canadian Journal of Earth Sciences 34, nr 4 (1.04.1997): 337–51. http://dx.doi.org/10.1139/e17-030.

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The tectonic setting of intraplate magmas, typically a plume intersecting a rift, is ideal for the development of Ni – Cu – platinum-group element-bearing sulphides. The plume transports metal-rich magmas close to the mantle–crust boundary. The interaction of the rift and plume permits rapid transport of the magma into the crust, thus ensuring that no sulphides are lost from the magma en route to the crust. The rift may contain sediments which could provide the sulphur necessary to bring about sulphide saturation in the magmas. The plume provides large volumes of mafic magma; thus any sulphides that form can collect metals from a large volume of magma and consequently the sulphides will be metal rich. The large volume of magma provides sufficient heat to release large quantities of S from the crust, thus providing sufficient S to form a large sulphide deposit. The composition of the sulphides varies on a number of scales: (i) there is a variation between geographic areas, in which sulphides from the Noril'sk–Talnakh area are the richest in metals and those from the Muskox intrusion are poorest in metals; (ii) there is a variation between textural types of sulphides, in which disseminated sulphides are generally richer in metals than the associated massive and matrix sulphides; and (iii) the massive and matrix sulphides show a much wider range of compositions than the disseminated sulphides, and on the basis of their Ni/Cu ratio the massive and matrix sulphides can be divided into Cu rich and Fe rich. The Cu-rich sulphides are also enriched in Pt, Pd, and Au; in contrast, the Fe-rich sulphides are enriched in Fe, Os, Ir, Ru, and Rh. Nickel concentrations are similar in both. Differences in the composition between the sulphides from different areas may be attributed to a combination of differences in composition of the silicate magma from which the sulphides segregated and differences in the ratio of silicate to sulphide liquid (R factors). The higher metal content of the disseminated sulphides relative to the massive and matrix sulphides may be due to the fact that the disseminated sulphides equilibrated with a larger volume of magma than massive and matrix sulphides. The difference in composition between the Cu- and Fe-rich sulphides may be the result of the fractional crystallization of monosulphide solid solution from a sulphide liquid, with the Cu-rich sulphides representing the liquid and the Fe-rich sulphides representing the cumulate.
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Smith, W. D., W. D. Maier i I. Bliss. "Contact-style magmatic sulphide mineralisation in the Labrador Trough, northern Quebec, Canada: implications for regional prospectivity". Canadian Journal of Earth Sciences 57, nr 7 (lipiec 2020): 867–83. http://dx.doi.org/10.1139/cjes-2019-0137.

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The Labrador Trough in northern Quebec is currently the focus of ongoing exploration for magmatic Ni-Cu-platinum group element (PGE) sulphide ores. This geological belt hosts voluminous basaltic sills and lavas of the Montagnais Sill Complex, which are locally emplaced among sulphidic metasedimentary country rocks. The recently discovered Idefix PGE-Cu prospect represents a stack of gabbroic sills that host stratiform patchy disseminated to net-textured sulphides (0.2–0.4 g/t PGE+Au) over a thickness of ∼20 m, for up to 7 km. In addition, globular sulphides occur at the base of the sill, adjacent to the metasedimentary floor rocks. Whole-rock and PGE geochemistry indicates that the sills share a common source and that the extracted magma underwent significant fractionation before emplacement in the upper crust. To develop the PGE-enriched ores, sulphide melt saturation was attained before final emplacement, peaking at R factors of ∼10 000. Globular sulphides entrained along the base of the sill ingested crustally derived arsenic and were ultimately preserved in the advancing chilled margin.
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Ofori-Sarpong, G., D. K. Adjei i R. K. Amankwah. "Fungal-Transformation of Surrogate Sulphides and Carbonaceous Matter in Refractory Gold Ores: Revisited". Ghana Mining Journal 17, nr 2 (13.12.2017): 56–65. http://dx.doi.org/10.4314/gm.v17i2.8.

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In the recovery of gold from refractory gold ores, pretreatment is required to decompose sulphides and liberate occluded gold before cyanidation, and to deactivate carbonaceous matter and prevent it from adsorbing dissolved gold. Until the past three decades, most commercial pretreatment processes had been by abiotic means. Biological pretreatment methods on commercial basis is therefore a recent phenomenon, and several researches are underway to assess the ability of different biological agents in the breakdown of sulphur and carbonaceous matter (CM) in gold ores. This paper, which is a revisit of an earlier one, presents an overview of on-going research aimed at assessing the capability of the fungus, Phanerochaete chrysosporium, to degrade sulphides and CM. Surrogate carbonaceous materials (lignite, bituminous and anthracite coals) and pure sulphides (pyrite and arsenopyrite) were used to model the behavior of CM and sulphides in refractory gold ores. To monitor the extent of biotransformation, preg-robbing test was conducted on the as-received and treated CM, and sulphide sulphur in the residual sulphidic materials was also determined. From an initial preg-robbing effect of 125 µg of gold per gram of CM, the ability of CM to preg-rob gold reduced by 70-95% in the order of lignite<bituminous <anthracite within 21 days of treatment, whereas there were 18% and 39% oxidation of sulphide sulphur in pyrite and arsenopyrite respectively. XRD examination of the treated anthracite confirmed reduction in the graphitic structure of carbon following fungal transformation. Similarly, there was a decline in the major sulphide peak after microbial pretreatment. The results indicate that the fungus biotransforms through destruction of the ordered structure, followed by introduction of oxygen groups. The amorphous nature, thus generated, inhibits the uptake of aurocyanide ions by CM, while enhancing the affinity of cyanide for the oxidised sulphide material in subsequent cyanidation treatment. The findings contribute to knowledge on novel and technically viable alternative methods for oxidative pretreatment of refractory gold ores. Keywords: Phanerochaete Chrysosporium, Carbonaceous Matter, Metal Sulphides, Biotransformation
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Smyk, Mark C., i David H. Watkinson. "Sulphide remobilization in Archean volcano-sedimentary rocks and its significance in Proterozoic silver vein genesis, Cobalt, Ontario". Canadian Journal of Earth Sciences 27, nr 9 (1.09.1990): 1170–81. http://dx.doi.org/10.1139/e90-124.

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The Archean volcano-sedimentary succession at Cobalt, Ontario, consists mainly of submarine andesitic flows and turbiditic interflow sedimentary rocks. Steeply dipping faults and large-scale, tight to isoclinar folds have developed in these basement rocks. The faults commonly host silver-vein-bearing structures that extend upward into overlying Proterozoic units. Synvolcanic and synsedimentary base metal sulphide deposits are ubiquitous in the Archean rocks. Epigenetic sulphide mineralization consists of remobilized and replacement sulphides and minor sulpharsenides. Epigenetic sulphides occur in permeable rocks and in fault and fracture zones, commonly in juxtaposition with silver veins.The coincidence of silver veins and structures containing remobilized sulphides suggests that sulphide remobilization from Archean basement rocks into Proterozoic vein-bearing structures predated or accompanied vein development. Sulphide remobilization may have also facilitated the mobilization (leaching) of metals from basement sulphides into the vein-forming hydrothermal fluids.
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Lutnicki, Krzysztof, Eligiusz Madej, Tomasz Riha i Łukasz Kurek. "Polioencephalomalacia in ruminants caused by excessive amount of sulphur - a review". Bulletin of the Veterinary Institute in Pulawy 58, nr 2 (1.06.2014): 321–26. http://dx.doi.org/10.2478/bvip-2014-0050.

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Abstract Polioencephalomalacia as a result of sulphur excess is a growing problem in cattle and sheep, mainly in young, growing animals. It is common in different regions of the world. The disease develops favoured by certain conditions such as sustained provision of feed and water with high sulphur content, use of dietary supplements containing sulphur, and a habitat with high hydrogen sulphide concentration. Pathogenesis of the disease is complex, but very important are oxidative-antioxidative imbalance, dysfunction of vessels, and secondary cerebral cortex ischaemia as a result of direct and/or indirect action of sulphur metabolites, namely hydrogen sulphide, sulphides, and sulphites. Clinical signs and changes in the cerebral cortex in the form of degenerative necrotic lesions are similar to those observed in polioencephalomalacia caused by vitamin B1 deficiency, and lead and salt intoxication. Highly increased sulphur content (more than 0.3-0.4 of dry matter) in the diet is the basis for differential diagnosis, as well the high concentration of hydrogen sulphide in gas and sulphides in rumen fluid. In prophylaxis and treatment the most important measure is to limit sulphur intake and in acute cases to neutralise low pH in rumen and administer vitamin B1 injections.
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Edwards, Grant A., Phillip A. Culp i Justin M. Chalker. "Allyl sulphides in olefin metathesis: catalyst considerations and traceless promotion of ring-closing metathesis". Chemical Communications 51, nr 3 (2015): 515–18. http://dx.doi.org/10.1039/c4cc07932a.

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Allyl sulphides provoke rapid olefin metathesis when matched with an appropriate catalyst. In relay metathesis, allyl sulphides can serve as traceless promoters that facilitate the synthesis of non-sulphide targets.
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DEMARIGNY, YANN, CÉLINE BERGER, NATHALIE DESMASURES, MICHELINE GUEGUEN i HENRY E. SPINNLER. "Flavour sulphides are produced from methionine by two different pathways by Geotrichum candidum". Journal of Dairy Research 67, nr 3 (sierpień 2000): 371–80. http://dx.doi.org/10.1017/s0022029900004209.

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We have investigated the capacities of Geotrichum candidum strains to produce sulphides from methionine. This attribute is very important in cheese technology because of the flavouring potential of sulphur compounds. A spectrophotometric procedure using 5,5′-dithiobis(2-nitrobenzoic acid) to determine sulphides was tested on a collection of G. candidum strains, and confirmed by gas chromatography–mass spectrometry. The strains were distinguished on the basis of their ability to produce methanethiol. Gas chromatography–mass spectrometry also made it possible to identify other sulphides, such as dimethyl disulphide, dimethyl trisulphide and dimethyl sulphide. Using sonicated cells, the specific production of these four sulphides was studied in presence of L-[S-methyl-2H]methionine. Both methanethiol and dimethyl sulphide were produced from methionine, but two different pathways were used by G. candidum.
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Luptakova, Alena, i E. Macingova. "Sorption of Copper Ions by Biogenic Iron Sulphides". Advanced Materials Research 20-21 (lipiec 2007): 631–34. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.631.

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Biogenic iron sulphides are excellent adsorbents for various heavy metals ions. Consequently, they have practical application for the elimination of heavy metals from waste waters. One of the principles for the iron sulphides preparation is the application of sulphatereducing bacteria. This biological-chemical method is based on the ability of these bacteria to reduce sulphates to hydrogen sulphide, which binds with the ferrous cations to form insoluble precipitates – iron sulphides. Under certain bacterial growth conditions biogenic iron sulphides can be magnetic. The aim of this work is to study the possibility of using SRB for the preparation of iron sulphides, which were used subsequently in the framework of sorption tests to eliminate copper ions from model solutions.
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Rozprawy doktorskie na temat "Sulphides"

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Yemul, O. S. "Novel polyarylene sulphides". Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1998. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3370.

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Igiehon, Uwagboe Osamede. "Carbothermic reduction of complex sulphides". Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46358.

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Bayerköhler, Frieder [Verfasser], i Philipp [Akademischer Betreuer] Kurz. "Iron-molybdenum sulphides as proton reduction catalysts". Freiburg : Universität, 2017. http://d-nb.info/1144148901/34.

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Smit, Timotheus Servaas. "Hydrodesulphurization of thiophenes using transition metal sulphides". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28084.

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O'Sullivan, Susan Nora. "The synthesis and application of chiral sulphides". Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272788.

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Coimbatore, Dhandayuth Venkatesh. "Cerium chloride inhibition for high strength low alloy steel exposed to sulphide polluted seawater". University of Western Australia. School of Mechanical Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0134.

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[Truncated abstract] Corrosion of steel structures caused by sulphide is a common engineering problem encountered by many industries, such as the petroleum, chemical processing, mining and mineral processing industries. The control of sulphide corrosion is still a controversial topic among corrosion engineers. There is an absence of guideline for a reliable acceptable limit of sulphide level in service and each processing industry has its own empirical values. Selection of inhibitors in the sulphide environment depends on laboratory testing before its actual application in pipelines and reaction vessels. Many investigators have postulated the corrosion mechanisms due to sulphide based on operating envelopes such as pH, chloride, manganese, hydrogen sulphide, sulphate reducing bacteria levels and inhibitor concentration. It is recommended in the literature that the batch dosing of inhibitor and biocide needs to be evaluated in regards to sulphide reducing bacteria (SRB) level, which may produce sulphide concentrations up to 2000 ppm. Although sulphide scale formation may protect the base metal by providing a physical barrier, the detrimental effects of sulphide are often inevitable, such as stress corrosion cracking, hydrogen embrittlement, etc. Currently, there are many chemicals that are used as inhibitors to prevent corrosion by scavenging the sulphide from the environment. Cerium, a rare-earth element, is not used as inhibitor in the sulphide environment. Also, there are no previous research findings on the effects of compounds of rare-earth metals, such as cerium chloride (CeCl3), in sulphide environment. This research examines the corrosion behaviour of 0.4Mo-0.8Cr steel, a High Strength Low Alloy (HSLA) steel, in sulphide-polluted artificial seawater with the addition of CeCl3 and glutaraldehyde. ... It is postulated that the moderate inhibiting effect of CeCl3 is due to the scavenging effect thereby forming Ce2S3 complex. Further reaction of sulphide with steel resulted in ferrous sulphide, leading to an increased corrosion rate. It is also concluded that the CeCl3 interferes with both anodic and cathodic reactions in deaerated conditions. Addition of glutaraldehyde in the sulphide-polluted seawater was found to decrease the corrosion rate. According to the electrochemical measurements conducted, the concurrent addition of glutaraldehyde and CeCl3 appeared to have an added effect on reducing the corrosion of the steel, as evidenced by the increase of the open circuit potential during the short-term testing. From the weight loss measurements after 60 days, sulphide pollution in deaerated seawater was found to increase corrosion rate. This is attributed to the increase of sulphide activity whereby continual dissolution of steel was encountered. From the weight loss tests, it was found that the addition of CeCl3 and glutaraldehyde reduced the corrosion rate of the steel in the solutions containing 0-10 ppm sulphide. There is no noticeable corrosion rate decrease for the solution containing 100 ppm sulphide. The added effect of CeCl3 and glutaraldehyde to the SRB medium has resulted in lower corrosion rates. Further detailed experimentation is required to elucidate the corrosion reduction mechanism in glutaraldehyde-containing environments.
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Mulligan, David John. "Reduction of sulphur dioxide over transition metal sulphides". Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61916.

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Arterton, Bruce William. "Preparation related luminescent properties in II-VI sulphides". Thesis, Coventry University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386517.

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Atkins, Alison J. "Solid state studies of ternary oxides and sulphides". Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320791.

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Maynard, Jonathan. "The genesis of sulphides in the Shetland ophiolite". Thesis, Open University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358559.

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Książki na temat "Sulphides"

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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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Weber, Thomas, Roel Prins i Rutger A. Santen, red. Transition Metal Sulphides. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3.

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Thomas, Weber, Prins Roelof, Santen R. A. van i NATO Advanced Research Workshop on Challenges for Sulphides in Material Sciences and Catalysis (1997 : Varna, Bulgaria), red. Transition metal sulphides: Chemistry and catalysis. Dordrecht: Kluwer Academic Publishers, 1998.

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Fumiyuki, Marumo, red. Dynamic processes of material transport and transformation in the earth's interior. Tokyo: Terra Scientific Pub. Co., 1991.

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1905-, Jokelson Paul, Tarshis Dena K, Corning Museum of Glass i New York-New Jersey Paperweight Collectors Association., red. Cameo incrustation: The great sulphide show : a loan exhibition : the Corning Museum of Glass, Corning, New York, April 21-October 23, 1988. Santa Cruz, Calif: Paperweight Press, 1988.

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Ltd, Cominco Engineering Services. Separation of sulphides from mill tailings: Phase I (MEND). Ottawa, Ont: Canada Centre for Mineral and Energy Technology = Centre canadien de la technologie des minéraux et de l'énergie, 1994.

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Flynn, Harry Eugene. Experimental verification of the use of free-energy minimization techniques for modelling complex sulfide smelting. Ann Arbor, MI: University Microfilms International, 1988.

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D, Zunkel A., Metallurgical Society of AIME, Canadian Institute of Mining and Metallurgy. i TMS-AIME Fall Extractive Meeting (1985 : San Diego, Calif.), red. Complex sulfides: Processing of ores, concentrates, and by-products : proceedings of a symposium. Warrendale, Pa: Metallurgical Society, 1985.

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Patai, Saul, i Zvi Rappoport, red. Syntheses of Sulphones, Sulphoxides and Cyclic Sulphides (1995). Chichester, UK: John Wiley & Sons, Ltd., 1995. http://dx.doi.org/10.1002/9780470666357.

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Jonsson, Jonas. Spectroscopic studies of some diatomc oxides and sulphides. Stockholm: Department of Physics, Stockholm University, 1995.

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Części książek na temat "Sulphides"

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Genin, H. S., i J. A. Ibers. "Solid State Transition Metal Sulphides". W Transition Metal Sulphides, 1–35. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_1.

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Kogan, V. M. "Reaction Dynamics during C-S Bond Breaking in Sulphur-Containing Molecules: Isotope Studies". W Transition Metal Sulphides, 235–71. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_10.

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Zdražil, M. "Effects of Catalyst Composition and Pretreatment on the Product Distribution in Hydrodesulphurization, Hydrodenitrogenation and Hydrodechlorination". W Transition Metal Sulphides, 273–309. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_11.

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Gosselink, J. W. "Metal Sulphides and Refinery Processes". W Transition Metal Sulphides, 311–55. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_12.

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Kaim, W., F. M. Hornung, R. Schäfer, J. Fiedler, M. Krejcik i S. Zališ. "Charge Transfer Phenomena in Transition Metal Sulphur Chemistry". W Transition Metal Sulphides, 37–55. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_2.

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Morris, R. H. "The Chemistry of the Dihydrogen Ligand in Transition Metal Compounds with Sulphur-Donor Ligands". W Transition Metal Sulphides, 57–87. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_3.

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Angelici, R. J. "Binding and Reactivity of Thiophene-Type Ligands in Transition Metal Complexes and Clusters". W Transition Metal Sulphides, 89–127. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_4.

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Bianchini, C., i A. Meli. "Hydrogenation, Hydrogenolysis and Desulphurization of Thiophenes by Soluble Metal Complexes". W Transition Metal Sulphides, 129–54. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_5.

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Byskov, L. S., J. K. Nørskov, B. S. Clausen i H. Topsøe. "Sulphur Bonding in Transition Metal Sulphides and MoS2 Based Structures". W Transition Metal Sulphides, 155–68. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_6.

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Hensen, E. J. M., V. H. J. Beer i R. A. Santen. "Chemistry and Reactivity of Transition Metal Sulphides in Relation to Their Catalytic Performance". W Transition Metal Sulphides, 169–88. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_7.

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Streszczenia konferencji na temat "Sulphides"

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Macías, Gabriela, Carlos Lorenzana i Javier Fernandez. "Determination of the Influence of Metal Sulphides on the Tribofilm and the Friction Behavior". W EuroBrake 2021. FISITA, 2021. http://dx.doi.org/10.46720/3291380eb2021-fbr-003.

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Metal sulphides are additives that are used in brake pad formulations because they help to stabilize the coefficient of friction, reduce wear and improve NVH. Previous rimsa studies have shown that the oxidation mechanism of metal sulphides is one of the key properties that explain their contribution to performance and wear. Depending on the metal sulphide, the oxidation mechanism is different and so is the tribochemistry. Hence, the transfer layer formed will strongly depend on the metal sulphide used. This work is focused on establishing a connection among the metal sulphide oxidation, the transfer layer formed and the performance. The friction behavior was determined through two tests, J2522 and J2707, using a NAO formula where only the metal sulphide was varied. While the transfer layer characterization was carried out through pad SEM-EDS cross-section analysis, after each test. The differences in thermal profile of J2522 and J2707 illustrate the correlation between performance and wear and different oxidation mechanisms depending on the metal sulphide used. SEM characterization of pad surface also shows that the transfer layer morphology varies depending on the metal sulphide used in the formulation. Hence, the results of this research indicate that the morphology of the transfer layer and the friction behaviour strongly depend on the oxidation mechanism of the metal sulphide.
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Sliburyte, Aukse, i Virgilijus Valeika. "Treatment of hide liming wastewater by carbon dioxide". W The 8th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2020. http://dx.doi.org/10.24264/icams-2020.iv.21.

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Results of the investigation of hide liming process wastewater treatment by carbon dioxide are presented in a paper. Comparison of the wastewater characteristics before and after the treatment by carbon dioxide was carried out. It was attempted to regenerate sodium sulphide using three different solutions: 10% solution of sodium carbonate and 5% or 10% solution of sodium hydroxide. The kinetic of sodium sulphide concentration, general alkalinity and pH was established. The solutions with the regenerated sodium sulphide were explored for unhairing of hide. The solution of 10% sodium hydroxide with regenerated sulphides was the mostly suitable for this aim. The properties of unhaired pelt were determined and assessed.
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Khan-Mohammadi, Ghazaleh, Abdrorrahman Rajabi, Shojaedin Niroomand, Pouria Mahmoodi, Carles Canet i Pura Alfonso. "Carbonate-hosted Zn-Pb-Cu-Ba (-Ag) mineralization in the Mehdiabad deposit, Iran: new insights, new discoveries". W Irish-type Zn-Pb deposits around the world. Irish Association for Economic Geology, 2023. http://dx.doi.org/10.61153/zzwj5211.

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The Mehdiabad deposit in the Yazd-Anarak metallogenic belt (YAMB), central Iran, is the largest carbonate-hosted Zn-Pb-Ba-Cu (-Ag) deposit in the world, with a reserve of 630 Mt sulphide and non-sulphide ore. It was formed during the Early Cretaceous by the replacement of barite and hydrothermally dolomitized breccia bodies of the Taft and Abkuh formations. This deposit consists of different ore zones, including the feeder zone, massive ore (including sulphide-oxide parts), massive barite ore, and copper-rich sulphide-barite ore, formed in an extensional environment related to the Naein-Baft back-arc basin. The deposit is stratabound and comprises a wedge-shaped sulphide-barite orebody with complex replacement textures of sulphides and barite. The primary sulphide ore, including a copper-rich core (with a reserve of more than 50 Mt of copper ore), developed in a barite sheath and characterized by the replacement of barite and pyrite by an assemblage of chalcopyrite, bornite, sphalerite and galena. Several stages of barite and sulphide deposition in the Mehdiabad deposit are similar to those reported in other Irish-type and barite-replacement sediment-hosted Zn-Pb deposits worldwide (e.g., Red Dog deposit, Alaska, USA).
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Jackson, Eric, i Don Clarke. "Subsea Excavation of Seafloor Massive Sulphides". W Oceans 2007. IEEE, 2007. http://dx.doi.org/10.1109/oceans.2007.4449312.

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Petrov, A. A. "SP Implementation in Deep-Sea Sulphides Searches". W 63rd EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.15.p045.

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Kumar, Upendra, Satadeep Bhattacharjee i Seung-Cheol Lee. "Highly efficient degradation of phenol via metal sulphides". W NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0064362.

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Rajabi, Abdorrahman, Pouria Mahmoodi, Ebrahim Rastad, Carles Canet, Pura Alfonso, Shojaedin Niroomand, Ali Yarmohammadi, Hamid Peernajmodin i Zahra Akbari. "An introduction to Irish-type Zn-Pb deposits in early Cretaceous carbonate rocks of Iran". W Irish-type Zn-Pb deposits around the world. Irish Association for Economic Geology, 2023. http://dx.doi.org/10.61153/zzug6529.

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Early Cretaceous carbonates are the most common host rocks for Irish-type deposits in Iran. They are largely concentrated in the Malayer-Esfahan metallogenic belt (MEMB) in southwestern Iran, and Yazd-Anarak metallogenic belt in Central Iran. They include some world‐class ore deposits such as Mehdiabad, Irankuh, and Ahangaran. These stratabound deposits are hosted mostly in carbonates with minor siltstones and volcanic components, that formed in extensional and passive margin environments that are related to the Nain-Baft back-arc basin. The deposits are stratabound and comprise wedge-shaped to tabular sulphide-barite orebodies and occur in several different stratigraphic horizons. Dolomitization and silicification are the main wall-rock alteration styles. Replacement textures are common, and orebodies represent complex textures of sulphides and barite, such as brecciated, colloform, zebra, minor laminated, and banded replacement. Barite is an important gangue mineral in the MEMB and YAMB deposits, partly replaced by coarse-grained galena, sphalerite, and chalcopyrite. Sulphides from these Irish-type deposits have a wide spread of light δ34S values (with the majority falling between -25 to +5‰) with mostly bacterial sulphate reduction (BSR) origin. Fluid inclusion studies show that homogenization temperatures of ore minerals are typically 120 to about 280°C (majority 225-275°C), and salinities range from 2 to 24 wt.% NaCl eq, with the majority falling between 8 and 22 wt% NaCl eq. Using the criteria outlined in this study, early Cretaceous extensional sedimentary basins (e.g., Nain-Baft) are highlighted as target areas for exploration of world-class Irish-type ore deposits and correspond well with the periods of expulsions of Cretaceous CaCl2-rich brines.
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Drummond, Drew, Robert Blakeman, John H. Ashton, Ian Farrelly, Jonathan Cloutier, Lola Yesares i Adrian Boyce. "Ore depositional processes at the carbonate-hosted Tara Deep Zn-Pb deposit, Navan, Ireland". W Irish-type Zn-Pb deposits around the world. Irish Association for Economic Geology, 2023. http://dx.doi.org/10.61153/dqcn2038.

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The Tara Deep Zn-Pb deposit (currently 26.2 Mt @ 8.4% Zn, 1.6% Pb) is the latest major discovery by Boliden Tara Mines (first announced in 2016) which significantly adds to the existing world-class Navan deposit. Located 2 km south of the Navan deposit in Co. Meath, Ireland, economic mineralization is hosted by upper Tournaisian carbonates (Pale Beds; 87% of the total economic resource), within a degraded footwall of a major south-dipping normal fault, and also within lower Visean sedimentary breccias (‘S Fault’ Conglomerates; SFC). Sphalerite and galena are the dominant sulphides, with massive, cavity fill and brecciated textures dominating. These textures attest complex, subsurface, episodic mineralization events that display considerable reworking, fracturing, dolomitization, open-space infill and selective replacement. Lower Visean syn-rift sliding, erosion, and deposition of thick debrites and calc-turbidites at Tara Deep record basin margin processes near extensional faulting associated with formation of the Dublin Basin. These debrites host detrital sulphide-rich clasts and offer unambiguous evidence that the onset of mineralization occurred during the upper Tournaisian. δ34S values of base metal sulphides have a bimodal distribution suggesting both bacteriogenic (-13.5 to -3.6‰) and hydrothermal sulphur sources (+3.4 to +16.2‰). Both textural and sulphur isotope data reveal the dynamic nature of mineralization at Tara Deep and infer fluid mixing. Lead isotope analyses display remarkably homogeneous 206Pb/204Pb of 18.23 ±0.006 (2σ, n=25), which is coincident with Pb isotope data across the Navan deposit. Subsequently, Tara Deep and Navan are isotopically similar, showing both a statistically identical Pb isotopic signature and a bimodal sulphide S isotopic distribution and homogeneous sulphate signature. In particular, the Pb isotopes and the hydrothermal S signature, correlate with Navan and support the view that base-metals were leached from the underlying Lower Palaeozoic basement, and suggest that similar deep, circulating metalliferous fluids were also involved at Tara Deep. However, despite these similarities, key differences can be recognized within the S isotope data; around 5‰ shifts to higher δ34S in the surface-derived S isotope signatures (both bacteriogenic sulphide and sulphate) indicate that Tara Deep’s sulphur was sourced from a distinct seawater/connate fluid signature. The Tara Deep deposit has many similarities with the neighbouring Navan deposit reflecting comparable controls on the mineralizing processes in terms of host rocks, Pb and S sources, and tectonic environment. Mineralization initiated during an early phase of the developing Dublin Basin (syn-diagenetically) and kept pace with rifting and subsequently an evolving basin.
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Drummond, Drew, Robert Blakeman, John H. Ashton, Ian Farrelly, Jonathan Cloutier, Lola Yesares i Adrian Boyce. "Ore depositional processes at the carbonate-hosted Tara Deep Zn-Pb deposit, Navan, Ireland". W Irish-type Zn-Pb deposits around the world. Irish Association for Economic Geology, 2023. http://dx.doi.org/10.61153/dpcd8412.

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The Tara Deep Zn-Pb deposit (currently 26.2 Mt @ 8.4% Zn, 1.6% Pb) is the latest major discovery by Boliden Tara Mines (first announced in 2016) which significantly adds to the existing world-class Navan deposit. Located 2 km south of the Navan deposit in Co. Meath, Ireland, economic mineralization is hosted by upper Tour-naisian carbonates (Pale Beds; 87% of the total economic resource), within a degraded footwall of a major south-dipping normal fault, and also within lower Visean sedimentary breccias (‘S Fault’ Conglomerates; SFC). Sphalerite and galena are the dominant sulphides, with massive, cavity fill and brecciated textures dominating. These textures attest complex, subsurface, episodic mineralization events that display considerable reworking, fracturing, dolomitization, open-space infill and selective replacement. Lower Visean syn-rift sliding, erosion, and deposition of thick debrites and calc-turbidites at Tara Deep record basin margin processes near extensional faulting associated with formation of the Dublin Basin. These debrites host detrital sulphide-rich clasts and offer unambiguous evidence that the onset of mineralization occurred during the upper Tournaisian. δ34S values of base metal sulphides have a bimodal distribution suggesting both bacteriogenic (-13.5 to -3.6‰) and hydrothermal sulphur sources (+3.4 to +16.2‰). Both textural and sulphur isotope data reveal the dynamic nature of mineralization at Tara Deep and infer fluid mixing. Lead isotope analyses display remarkably homogeneous 206Pb/204Pb of 18.23 ±0.006 (2σ, n=25), which is coincident with Pb isotope data across the Navan deposit. Subsequently, Tara Deep and Navan are isotopically similar, showing both a statistically identical Pb isotopic signature and a bimodal sulphide S isotopic distribution and homogeneous sulphate signature. In particular, the Pb isotopes and the hydrothermal S signature, correlate with Navan and support the view that base-metals were leached from the underlying Lower Palaeozoic basement, and suggest that similar deep, circulating metalliferous fluids were also involved at Tara Deep. However, despite these similarities, key differences can be recognized within the S isotope data; around 5‰ shifts to higher δ34S in the surface-derived S isotope signatures (both bacteriogenic sulphide and sulphate) indicate that Tara Deep’s sulphur was sourced from a distinct seawater/connate fluid signature. The Tara Deep deposit has many similarities with the neighbouring Navan deposit reflecting comparable controls on the mineralizing processes in terms of host rocks, Pb and S sources, and tectonic environment. Mineralization initiated during an early phase of the developing Dublin Basin (syn-diagenetically) and kept pace with rifting and subsequently an evolving basin.
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GAPONIK, N., D. SHCHUKIN, A. KULAK i D. SVIRIDOV. "SYNTHESIS OF Q-SIZED METAL SULPHIDES IN THE ELECTROPOLYMER MATRIX". W Reviews and Short Notes to Nanomeeting '97. WORLD SCIENTIFIC, 1997. http://dx.doi.org/10.1142/9789814503938_0042.

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Raporty organizacyjne na temat "Sulphides"

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Hulbert, L. J. Sedimentary nickel sulphides. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/207972.

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Lydon, J. W. Sedimentary exhalative sulphides (Sedex). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/207970.

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Duran, C. J., S. J. Barnes, P. Pagé, H. Dubé-Loubert, M. Roy i D. Savard. Trace element signatures of magmatic sulphides: petrogenetic implications and exploration applications. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/306314.

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Paradis, S. Sulphides and nonsulphides of the Prairie Creek district; update on the isotope geochemistry. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296335.

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Cogulu, E. H. Mineralogy and chemical variations of sulphides from the Crystal Lake Intrusion, Thunder Bay, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/192441.

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Santaguida, F., M. Hannington i C. Jowett. An alteration and sulphur isotope study of the Pilley's Island massive sulphides, central Newfoundland. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132902.

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Killeen, P. G., C. J. Mwenifumbo i B. E. Elliott. The pseudo-geological log: using geophysical logs as an aid to geological logging in volcanogenic massive sulphides. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/205216.

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Yergeau, D., P. Mercier-Langevin, B. Dubé, S. Jackson, M. Malo, C. Bernier i P. Simard. Synvolcanic Au-Ag±Cu-Zn-Pb massive sulphides, veins and disseminations of the Westwood deposit, Abitibi greenstone belt, Québec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293117.

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Paakki, J. J., J. W. Lydon i N. Del Bel Belluz. Durchbewegt sulphides, piercement structures, and gabbro dyke displacement in the vent complex of the Sullivan Pb-Zn deposit, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/202762.

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Yao, Z. S., Y. Z. Li i J. E. Mungall. Transport and deposition of sulphide liquid - vectors to ore accumulations. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328979.

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This project aims to model the kinetic controls on sulphide composition due to the extraction of chalcophile elements from silicate magmas, and use the numerical models to deepen our knowledge of the physical constraints that govern sulphide dynamic processes (e.g., breakup, coalescence, transport and deposition) in magmatic system. Based on the new understanding obtained from these forward models, we then take the textural and compositional features of sulphide globules from the field investigation at Raglan komatiite-associated deposits for instance, to better understand the control on entrainment, transport and deposition of sulphide liquids within the ore-forming processes.
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