Results 141 to 150 of about 2,095 (190)
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Economic Geology, 1960
Discussion of a paper by B.H. Flinter (GeoScience Abstracts 1-1752). The term "hydroilmenite" is less preferable than "altered ilmenite" or "weathered ilmenite." The use of the term "arizonite" for fine-grained but well-crystallized alteration products of ilmenite is unjustified because this type of material is well covered by the term "leucoxene." A ...
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Discussion of a paper by B.H. Flinter (GeoScience Abstracts 1-1752). The term "hydroilmenite" is less preferable than "altered ilmenite" or "weathered ilmenite." The use of the term "arizonite" for fine-grained but well-crystallized alteration products of ilmenite is unjustified because this type of material is well covered by the term "leucoxene." A ...
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Reduction of Ilmenite with Charcoal
Journal of Chemical Education, 2005This laboratory exercise introduces students to a heterogeneous reaction and the use of X-ray diffraction to identify mineral phases and to propose reaction schemes. The exercise involves the reduction of ilmenite with charcoal and the efficiency of the reduction process is monitored using wet-chemical methods.
Kristy M. Blyth +4 more
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Attenuation of Fast Neutrons in Ilmenite Concretes
Health Physics, 1979Energy distributions of fast neutrons (> 0.5 MeV) transmitted through slabs of normal and high density ilmenite concretes, obtained by time of flight methods, are presented for concrete thicknesses increasing in steps of 7.6 cm from 0 to 46 cm.
Adams, R. J., Lokan, K. H.
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Economic Geology, 1966
Ilmenite and its alteration products in commercial heavy-mineral concentrates were studied by means of chemical analysis, optical microscopy, electron microscopy, electron microprobe, and X-ray diffraction. Breakdown of ilmenite involves oxidation and ultimate removal of iron.
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Ilmenite and its alteration products in commercial heavy-mineral concentrates were studied by means of chemical analysis, optical microscopy, electron microscopy, electron microprobe, and X-ray diffraction. Breakdown of ilmenite involves oxidation and ultimate removal of iron.
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Journal of Solid State Chemistry, 1970
Abstract Roasting ilmenite concentrates with alkali metal carbonates and nitrates at 860°C produced a series of MFeTi oxide phases (M = Na or K) which were readily interconvertible on adding alkali or ilmenite, as appropriate, and reroasting at 860°C. Mixed NaK compounds were not observed.
E. Foley, Kathryn P. MacKinnon
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Abstract Roasting ilmenite concentrates with alkali metal carbonates and nitrates at 860°C produced a series of MFeTi oxide phases (M = Na or K) which were readily interconvertible on adding alkali or ilmenite, as appropriate, and reroasting at 860°C. Mixed NaK compounds were not observed.
E. Foley, Kathryn P. MacKinnon
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Lunar and Terrestrial Ilmenite Basalt
Science, 1971A basalt hornfels from the Keweenawan Duluth complex in Minnesota contains 7 percent by weight of titanium dioxide and is similar in many respects to the Apollo 11 samples. Hornfels texture, as well as primary textures in lunar rocks, resemble those in Keweenawan rocks.
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Mechanochemical Reactions of Ilmenite
Materials Science Forum, 1998Natural ilmenite samples (containing both FeTiO 3 and Fe 2 Ti 3 O 9 phases) have been ball milled in two atmospheres (vacuum and air). Different mechanochemical reactions were observed and the reaction processes were investigated by analysing the as-milled samples using X-ray diffraction and Mossbauer spectroscopy.
Ying Chen, J.S. Williams, S.J. Campbell
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Kinetics of the oxidation of ilmenite
Oxidation of Metals, 1975The oxidation of ilmenite (FeTiO3) in air and dry oxygen was investigated over the temperature interval 600 to 970°C. Dense platelets of ilmenite crystals as well as powder samples of ilmenite were oxidized. The weight data were recorded employing a thermobalance. The oxidation kinetics of ilmenite platelets were parabolic except for the initial stages
D. Bhogeswara Rao, M. Rigaud
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Ferroelectricity in the Ilmenite Structure
Physical Review, 1952The ferroelectricity of the ilmenite structure minerals lithium tantalate and lithium niobate is studied theoretically, using the method recently introduced by Slater for barium titanate. The metal ions are assumed to move in a potential which has small quartic terms as well as the usual quadratic terms, all satisfying the appropriate crystal symmetry ...
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Alteration of ilmenite and "arizonite
Economic Geology, 1960Criticizes the proposed use of the term arizonite to designate the end-product of alteration of ilmenite, as suggested in a paper by Flinter.
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