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Showing 1 to 20 of 71 for “"ilmenite"”.
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Extraction of titania from ilmenite
… a process for separating titanium dioxide from ilmenite. The process makes use of three chemical reactions, all conducted at high temperatures. Ilmenite is first oxidised with air, the oxidised ilmenite is then treated with chlorine,' and finally the ferric chloride an.d oxygen produced by the …
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The oxidation of ilmenite: a kinetic study
Synthetically obtained ilmenite (FeO·TiO₂) particles were oxidized under conditions of a non-linear temperature increase over the range 300°-850°C. Short-circuit diffusion in the initial stages of oxidation gave an activation energy of 4.35 ± 0.4 kcal/mole, while above 525°C the activation energy …
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Provenance of Sands Within the Lower Chesapeake Bay Based on Ilmenite Composition
<p>Surficial sands deposited in the Chesapeake Bay are a mixture of sands derived from the bay's shorelines, from offshore, and from relict deposits. Direct fluvial input is probably minor except from the James River, which may serve as a local source of sands in the Thimble Shoals area. Sands in …
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Mineralogy and provenance of the TiO₂ - ilmenite heavy mineral sand deposit of Nataka
… monazite, and the valuable phases dominated by ilmenite (50.91 wt. %), with additional zircon and rutile (9.96 and 3.52 wt. % respectively). The total heavy minerals comprise about 5% volume, of which 2 % are valuable heavy minerals making up about 445 Mt (million tonnes) probable resources. …
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The use of upper mantle derived ilmenite to predict preservation of diamond parcels in Kimerlite
Bibliography: leaves 80-95.
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THORIUM SPECIATION IN SYNTHETIC ANHYDRITE, PLACER ILMENITE CONCENTRATE, AND TITANIA SLAG: IMPLICATIONS FOR THORIUM GEOCHEMICAL BEHAVIOR, SEQUESTRATION, AND BENEFICIATION
… produced in relevant experimental conditions. Ilmenite concentrate from the Mandena deposit, Madagascar, used to produce titania slag, contains 133 ppm Th and 12.8 ppm U. Our data show that monazite-(Ce), mainly as discrete grains, accounts for ~55% of thorium in the Mandena ilmenite …
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Chlorination of Titanium Oxycarbide and Oxycarbonitride
… reactions. The project studied titania, ilmenite ores, and synthetic rutile reduced by carbon in argon and nitrogen and chlorinated at different temperatures, gas flow rates and compositions. Chlorination of titanium suboxides, iron and impurities in ilmenite was also examined. …
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Advanced photoanodes for photoassisted water electrolysis
… conformed by the electrical conductivity of ilmenite hematite solid solution bulk samples as a function of temperature and oxygen partial pressure. The enthalpies of the Schottky defect formation and the reduction reaction for hematite were determined as 13.4 eV and 5.4 eV, respectively. In …
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Mineral Chemistry of Heavy Minerals in the Old Hickory Deposit, Sussex and Dinwiddie Counties, Virginia
… found in the heavy mineral sands at the site are ilmenite (FeTiO₃), leucoxene (Fe<SUB>2-x</SUB>Ti<SUB>3+x</SUB>O<SUB>9+x/2</SUB>) where x is less than or equal to 2, rutile (TiO₂), and zircon (ZrSiO₄). An important focus of this study is the alteration of ilmenite by leaching away of iron, which …
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Mineralogic and Geochemical Variations within the Old Hickory Heavy Mineral Sand, Sussex and Dinwiddie Counties, Virginia
… in order of decreasing concentrations, are ilmenite, rutile, and zircon, which are believed to have been derived from weathering of Piedmont and Blue Ridge sources. After fluvial transport to the coast, the ore minerals were redistributed laterally along the coast by longshore currents, and …
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Lode gold deposit characterization using evidence from stream sediments: an example from Brush Creek, Montgomery County, Virginia
… Virginia, contain relict quartz, orthoclase, ilmenite and mica. Textures, and fluid inclusion composition and character in the relict quartz, indicate that the gold mineralization post dated the mylonitization associated with the Fries ductile deformation zone, which hosts the gold …
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Geology of the Piney River-Roseland titanium area, Nelson and Amherst counties, Virginia
… introduced or recrystallized quartz, rutile, and ilmenite. The mafic minerals include tremolite or anthophyllite, in complete or partial pseudomorphs after coarse-grained pyroxene crystals, and abundant alteration halos of biotite and chlorite. Most of the rocks have a well developed, generally …
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Mantle conditions and kimberlite geochemical criteria controlling diamond survival in Kimberlites
… indicator minerals (olivine, garnet, spinel, ilmenite and pyroxene) reflect these alteration / redox reactions. The hydrothermal-metasomatic processes are associated with factors that controlled kimberlite emplacement. Mössbauer spectroscopy and EMPA results reveal that in the diamondiferous …
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The Lithology of Herman and Campbell Beach of Glacial Lake Agassiz in the Area of Larimore and Arvilla, North Dakota
… minerals found in both beaches are: magnetite, ilmenite, biotite, amphibole, tourmaline, and hyalophane.</p>
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Aspects of the chemistry of titanium dioxide in fused salt solvents
… alkali borate solvents. Extraction of TiO2 from ilmenite and titaniferous slag, using selected low-basicity alkali borate solvents has been attempted. The results indicate that TiO2 may be separated from ilmenite in essentially a one-step process.
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A detailed geochemical investigation of diamond-bearing eclogite xenoliths from the Kaalvallei kimberlite, South Africa
… graphite on diamond surfaces. One has accessory ilmenite. The rocks are well equilibrated and are classified as Group 1 eclogites, based on their mineral textures and compositions. The calculated equilibrium temperatures for the eclogites range from 1157 °C to 1245 °C, assuming a pressure of 50 …
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Megacryst suite from the Salpeterkop carbonatite complex, Sutherland, Northern Cape, South Africa: an in-depth geochemical study
… The clinopyroxene, amphibole, phlogopite and ilmenite megacrysts all appear to be cogenetic, and based on known mineral relationships and intergrowths from xenoliths in the complex, the apparent order of mineral crystallisation is as follows: phlogopite → ilmenite → amphibole → clinopyroxene. …
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Petrography and petrology of "unakites" located in the Mount Rogers area, southwestern Virginia
… per cent; epidote, 22.3 per cent; and traces of ilmenite and hematite. Texture and mineral composition indicate this rock to be a hypersolvus unakite. Evidence favoring a primary origin for the epidote includes: 1) inclusion of euhedral epidote grains in primary quartz, 2) epidote inclusions in …
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CPFD Modeling of a Novel Internally Circulating Bubbling Fluidized Bed for Chemical Looping Combustion
… designing a pilot scale PCLC system which uses ilmenite as the oxygen carrier and a novel fluidized bed design called the Plug Flow Internally-recirculating Reactor (PFIR). The PFIR consists of an annular bubbling fluidized region in which particles are circulated by angle jets through two …
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