Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"sulfidation"”.
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Sulfidation of synthetic biotites
A series of hydrothermal experiments at 2000 bars have been conducted in order to investigate the systematic relation between biotite composition on the join phlogopite-annite and the composition of pyrrhotite. In an attempt to bracket the sulfide-silicate compositional pairs, three layers within a …
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Simultaneous oxidation/sulfidation of Cr-Nb alloys
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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High temperature sulfidation and reduction of zinc titanate and zinc oxide sorbents
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1991.
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Sulfidation of Ternary Oxides: A Thermodynamic and Experimental Study Toward Selective Metal Extraction
… accommodate post-consumer recycling feedstocks. Sulfidation is a promising pyrometallurgical approach for the selective separation and recovery of critical elements from such complex feedstocks. This thesis presents a chemical thermodynamic framework for the sulfidation of divalent alkaline earth …
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Paragenesis, fluid origin, and thermal history of a low-sulfidation epithermal gold-silver system
… gas compositions as an exploration tool for low-sulfidation deposits. Two-thirds of the gold from the Lesley Ann deposit is associated with pyrite, found in zones of intense silicification, and precipitated due to sulfidation of rhyolitic host rock during the earliest stages of hydrothermal …
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Kinetics study of reduction/sulfidation of ZnO and zinc titanate powders in a drop-tube furnace
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Geologic setting, Mineralization, and Detailed Underground Mapping of the Fire Creek Low-Sulfidation Epithermal Gold-Silver Deposit, Nevada
… Northern Nevada Rift (NNR). This shallow, low sulfidation epithermal vein deposit is hosted in Miocene age volcanic rocks, intrusions, and volcaniclastic sediments. It occurs in a similar structural setting as the Mule Canyon low sulfidation epithermal gold and silver deposit, which is located …
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Characterization of the Gold Hill low-sulfidation epithermal Au-Ag vein system, northern Nye County, Nevada; Implications for continued discoveries in established mining districts
The Gold Hill low-sulfidation epithermal (LSE) vein system is an exceptionally well-preserved and extensive (~400k oz Au (eq.), RMGC internal data, 2023.) Oligocene-age vein deposit located within the Round Mountain mining district of northern Nye County, Nevada, USA. Gold Hill is seven kilometers …
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Mineral deposition in epithermal deposits formed through flash vaporization and implications for improved understanding of the Arista intermediate-sulfidation epithermal deposit in southern Mexico
… inclusion evidence from the Arista intermediate-sulfidation deposit in southern Mexico suggests that flashing along the major extensional structures controlling the location of the deposit occurred over ~1 km below the paleosurface. Deposition of high-grade ores over such a large vertical extent …
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Total Synthesis of Verticillin A and Application of Diazene-Directed Fragment Assembly to the Synthesis of Heterodimeric Epidithiodiketopiperazine Derivatives
… in 16 steps. Our initial strategy of late-stage sulfidation on a dimeric substrate produced an undesired diastereomer of ETP. We were able to access an ETP with the desired diastereoselectivity by effecting sulfidation on an epimerized, monomeric substrate. In order to install a disulfide with …
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Recycling of Rare Earth Magnets with Sulfur Based Chemistries and High Temperature Processing
… magnet recycling is limited. In this work, sulfidation is investigated in the context of RE separation and recovery from RE-based magnets. Evidence of rare-earth separation and selectivity are presented, with insights into the underlying sulfidation mechanism involved for actual magnet …
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Controlled Evaluation of Metal-Based Nanomaterial Transformations
… transformations of MNPs. Specifically, sulfidation of silver nanoparticles (Ag NPs) and dissolution of copper-based nanoparticles (Cu NPs) were investigated. Atomic force microscopy (AFM) and transmission electron microscopy were the primary analytical techniques for these …
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Electrospun nanofibrous metal oxides as regenerable adsorbents for desulfurization of biomass-derived syngas
… that facilitates short contact time so that deep sulfidation of sorbent can be avoided without affecting the sulfur removal capacity. As this would require high gas velocity along with sorbent's high specific surface area, the use of conventional bulk sorbent will lead to incomplete regeneration …
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Pyrometallurgical Oxide-Sulfide Anion Exchange for Improved Material Separation and Metal Production
… Herein, thermodynamic modelling and oxide sulfidation kinetic measurements enable for the first time the establishment of an integrated thermodynamic, kinetic, and mass transport framework for pyrometallurgical oxide-sulfide anion exchange. Selective sulfidation via this methodology is …
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Models of high-temperature desulfurization using zinc-based sorbents
… histories of zinc oxide particle undergoing sulfidation using H2S at temperature in the range of 482 to 593 degree centigrade.;By using SEM (Scanning Electron Microscope) and Visilog(TM) imaging analysis software, the grain size distribution and grain sphericity can be obtained.;The basic …
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Sulfide immobilization with taconite tailings: products, capacity, and stability
… immobilization capacity. In Chapter 3, the sulfidation of Fe-rich clays in Mesabi Select are explored further, firstly by their selective dissolution with various acids and secondly by the reactivity of these acid-treated fractions with sulfide. By comparison, the contributions of individual …
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Desulfurization by reactive adsorption on oxide/metal composites
… a rapid surface reaction and complete bulk sulfidation of the oxide. To attain this goal, surface activity and diffusion through the ZnS product layer, must be accelerated. Nano-structuring of oxides, controlling the size and morphology together with the thoughtful compositional changes can …
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Iron Production by Molten Sulfide Electrolysis
… are investigated and discussed, along with sulfidation; the feedstock preparation step for the MSE process.
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Assessing the Potential for Carlin-type Gold in Northern Nye County, Nevada
… of Carlin-type, carbonate-hosted, and ow sulfidation epithermal gold mineralization.A total of 119 drainage basins are highlighted as geochemically prospective for Carlin-type mineralization through FA. However, this technique does not differentiate between Carlin-type, carbonate-hosted, …
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Modeling of mechanisms affecting the growth and breakdown of iron sulfide films
… to investigating two unit processes (surface sulfidation and ionic diffusion) that contribute to the growth of iron sulfide phases and is primarily focused on quantifying the kinetic parameters involved in the sulfidation (adsorption energies and dissociation barriers) and ionic diffusion …
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