Results 181 to 190 of about 31,615 (205)
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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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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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Chloridization beneficiation of ilmenite
Metallurgical Transactions B, 1984Chloridization is a potential method of beneficiating ilmenite. Studies on beneficiation of ilmenite were carried out by using titanium chloride as the chloridizing agent in a laboratory scale fluidized bed reactor. Experiments were conducted on 1, 10, and 36 grams per batch scale, and the effect of the various rate determining steps on conversion was ...
K. Swaminathan, CH. Sridhar Rao
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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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The significance of groundmass ilmenite and megacryst ilmenite in kimberlites
Contributions to Mineralogy and Petrology, 1981Criteria are suggested for distinguishing xenocrystic ilmenites from those indigenous to the host kimberlite. For instance, in contrast to groundmass grains, ilmenite xenocrysts usually are larger, have reaction rims of leucoxene and perovskite, exhibit strong magnesium enrichment outward, and sometimes have exsolution lamellae and deformation features.
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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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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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Economic Geology, 1959
"The oxidation of ilmenite in air at high temperatures (850 degrees C) yields a mixture of hematite, pseudobrookite, and rutile in an approximate molar ratio of 1:5:7. This product is almost identical with naturally occurring 9brown leucoxene,9 a naturally occurring alteration (weathering) product of ilmenite."
M. D. Karkhanavala, A. C. Momin
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"The oxidation of ilmenite in air at high temperatures (850 degrees C) yields a mixture of hematite, pseudobrookite, and rutile in an approximate molar ratio of 1:5:7. This product is almost identical with naturally occurring 9brown leucoxene,9 a naturally occurring alteration (weathering) product of ilmenite."
M. D. Karkhanavala, A. C. Momin
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Ilmenite from Jacupiranga, Brazil
Mineralogical Magazine and Journal of the Mineralogical Society, 1907During the summer of this year certain crystals of zirkelite from Ceylon were entrusted to the author for crystallographical investigation, and in that connexion the specimens placed under this species in the British Museum collection were examined for the sake of comparison. The whole of the latter specimens come from Jaeupiranga in São Paulo, Brazil:
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Conditions for ilmenite alteration
Economic Geology, 1961Discussion of GeoScience Abstracts 3-1630. In order that Austin9s postulation be applicable to sand ilmenites generally, it would be necessary to explain their high ferric iron content. The presence of ferric iron and lower intensity of alteration in New Jersey and other sand ilmenites is good evidence for a different alteration environment than that ...
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