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 24 for “"Oxide minerals"”.
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Flotation characteristics of certain copper oxide minerals
Includes bibliographical references (pages 69-70).
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Application of manganese oxide minerals to treat acidic waters contaminated with vanadium
… This thesis investigated manganese(III/IV) oxides (MnOx) as sustainable, reuseable sorbents for V removal from acidic aqueous systems, combining mechanistic analysis with validation in real industrial wastewater. A systematic comparison of natural, commercial, synthetic, and biogenic MnOx …
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Trace Element Cycling during Iron(II)-activated Recrystallization of Iron(III) Oxide Minerals
… reactions between aqueous Fe(II) and Fe(III) oxide minerals, which results in dynamic recrystallization via simultaneous Fe(II) oxidative adsorption and Fe(III) reductive dissolution. Fe(III) oxide minerals are abundant in soils, sediments, and groundwater systems, and often control the fate …
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New insights into the marine oxygen cycle from manganese oxide minerals and reactive oxygen species
… intermediate redox states including hydrogen peroxide and superoxide, has profound impact on the availability and distribution of dissolved O2, the habitability of the marine biosphere, and cellular metabolic and physiological reactions that utilize O2. The sum total of processes that produce, …
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A study of the flotation characteristics of a complex copper ore
… zoned profile comprising leached, refractory, oxide, mixed and hypogene sulphide mineralisation. As a result of the mineral variations, the processing plant treats three distinct ore types; oxide, sulphide and mixed. The objective of this study was to investigate the floatability of a complex …
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Effect of hydrological flow pattern on groundwater arsenic concentration in Bangladesh by Khandaker Ashfaque.
… reductive dissolution of various arsenic bearing oxides (the widely accepted mechanism for arsenic mobilization in Bangladesh) deposited at the pond bottoms. The process of reductive dissolution occurs in the presence of organic matter and under reducing environment, when residing microbes respire …
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The role of pulp chemistry in the flotation recovery of Nchanga underground copper ore
… copper ore is a complex mixture of sulphide and oxide minerals and processing consists of sulphide flotation followed by sulphidisation and an oxide flotation step. The work reported in this study involves that ofthe underground copper ore only.
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The Influence of Oxyanions on the EDTA-Promoted Dissolution of Goethite
… EDTA, accelerate the dissolution of silicate and oxide minerals. In natural systems oxyanions can compete with organic ligands for mineral surface sites thereby affecting ligand-promoted dissolution rates. Oxyanions can either enhance or inhibit dissolution depending upon pH. It has been suggested …
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The Mineralogy, Geochemistry and Phosphate Paragenesis of the Palermo #2 Pegmatite, North Groton, New Hampshire
… silicate, carbonate, sulfide, arsenide and oxide minerals locally present in the core margin. Concomitant alteration of these associated minerals contributes the necessary ions to the hydrothermal fluids responsible for the formation of the diverse suite of secondary phosphates. Alteration …
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Petrographic, geochemical, and textural analyses of interbedded gypsum and Cu-ore deposits in the Upper Miocene Boleo Formation, Baja California Sur, México
… resulting in clay alteration, precipitation of oxide minerals, and rehydration of anhydrite to gypsum. These findings reflect a synsedimentary-syndiagenetic depositional model influenced by fluid–rock interaction, brine evolution, and diagenetic processes.
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Development of novel computational techniques for phase identification and thermodynamic modeling, and a case study of contact metamorphism in the Triassic Culpeper Basin of Virginia
… for correctly identifying various sulfide and oxide minerals. An analysis of paragenesis associated with Central Atlantic Magmatic Province (CAMP) intrusions helps to better constrain the dynamics of magma emplacement, while also providing a method for estimating the amount of sedimentary …
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The igneous petrology, thermal history, and genesis of sedimentary rock-hosted Au deposits in the northern Battle Mountain mining district, Nevada
… outcrop is dominated by silica and secondary Fe-oxide minerals, which represent precursor Fe-bearing minerals, such as sulfides (ore-stage or otherwise). In the past, techniques to differentiate mineralized from unmineralized jasperoids have focused on the silica, rather than the Fe-oxide …
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Nanoscience Meets Geochemistry: Size-Dependent Reactivity of Hematite
… demonstrated that nanoscale crystalline iron oxide minerals are common in natural systems. The discipline of nanoscience suggests that these particles in the size range of approximately 1-50 nm will have properties that deviate from the bulk properties of the same material and that these …
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Evaluation of lateritic coarse aggregates as a partial replacement for granite coarse aggregates in structural concrete.
… were composed of 43.7% Crystalline iron oxide (FeO (OH)) (Goethite), 38% Kaolinite i.e. Clay mineral (Al2O3 2SiO2·2H2O), 18.3% Quartz (SiO2) and abundant amorphous (non-crystalline) iron oxide minerals such as Ferrihydrite (Fe2O3•H2O). A trial mix for 30MPa concrete was done in the …
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Evaluation of lateritic coarse aggregates as a partial replacement for granite coarse aggregates in structural concrete.
… were composed of 43.7% Crystalline iron oxide (FeO (OH)) (Goethite), 38% Kaolinite i.e. Clay mineral (Al2O3 2SiO2·2H2O), 18.3% Quartz (SiO2) and abundant amorphous (non-crystalline) iron oxide minerals such as Ferrihydrite (Fe2O3•H2O). A trial mix for 30MPa concrete was done in the …
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Insights on the reactivity of environmental iron-containing nanoparticles.
Iron oxide minerals play an important role in natural processes including redox reactions and adsorption of trace species. Ferrihydrite (Fe5HO8*4H2O) is a metastable iron oxide that forms particles in the 3-10 nm size range and is believed to be a major player in the environment. The reactivity of …
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A Novel Manganese Oxidising Bacterium: Characterisation and Genomic Evaluation
The production of manganese oxide minerals is predominantly mediated by microbes, resulting in the formation of highly redox active minerals which influence the geochemical cycling of many elements; including carbon, nitrogen, sulphur and many metals. This thesis describes the characterisation and …
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Geochemistry of Arsenic, Manganese, and Iron in the Dexter Pit Lake, Tuscarora, Nevada
… also shows that upon turnover events, the oxide minerals manganite (MnOOH) and goethite (FeOOH) are precipitated, and that these minerals control the solubility of Mn and Fe. Adsorption modeling shows that As is subsequently adsorbed to these oxide phases, but that likely only ~10% of As …
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Geochemistry and origin of the Asimotrypes carbonate hosted mesothermal gold deposit, Pangeon mountain, N. Greece
… to a lesser extent in Aspyrite, or free in the oxide minerals.<br/><br/>Three types of fluid inclusions (with subtypes) were recognised based on constituent phases at room temperature and microthermometric behaviour: (i) H<sub>2</sub>O-CO<sub>2</sub> 3-phase inclusions: L<sub>1</sub> …
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