Journal ArticleDOI
Phase transformations during heating of llmenite concentrates
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In this article, pseudorutile is heated in argon and oxygen in the temperature range 700 °C to 1000 °C and a new phase Fe2O3-2TiO2 is identified as an intermediate product.Abstract:
llmenite concentrates were heated in argon and oxygen in the temperature range 700 °C to 1000 °C to study the behavior of the pseudorutile phase and other changes which occur. Pseudorutile does not persist in argon or oxygen in the temperature range studied. In argon at 700 °C, pseudorutile decomposes into hematite and rutile, while at 1000 °C, it combines with ilmenite to form ferrous-ferritic pseudobrookite solid solution. A new phase “Fe2O3-2TiO2” was identified as an intermediate product during the heating of ilmenite or pseudorutile in oxygen. This compound decomposes into hematite and rutile below 800 °C and to pseudobrookite and rutile above 800 °C. The sequence of reactions during the heating of ilmenite and pseudorutile in oxygen is proposed.read more
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Semiconductor Photocatalysis—Mechanistic and Synthetic Aspects
TL;DR: Novel atom-economic C-C and C-N coupling reactions illustrate the relevance of semiconductor photocatalysis for organic synthesis, and demonstrate that the multidisciplinary field combines classical photochemistry with electrochemistry, solid-state chemistry, and heterogeneous catalysis.
Journal ArticleDOI
The use of ilmenite as an oxygen carrier in chemical-looping combustion
TL;DR: In this article, the feasibility of using ilmenite as an oxygen carrier in chemical-looping combustion has been investigated, and it was found that the resulting oxygen is an attractive and inexpensive oxygen carrier.
Journal ArticleDOI
Kinetics of redox reactions of ilmenite for chemical-looping combustion
TL;DR: In this article, the authors used the changing grain size model (CGSM) to predict the evolution with time of the solid conversion and to determine the kinetic parameters of both reduction and oxidation reactions taking place in the chemical-looping combustion process using ilmenite as an oxygen carrier.
Journal ArticleDOI
Solid state reduction of Panzhihua titanomagnetite concentrates with pulverized coal
TL;DR: In this article, the influence of reduction conditions on the metallization degree of the samples, such as reduction temperature, C/Fe molar ratio, pre-oxidation and additives were studied.
Journal ArticleDOI
Nitrogen Photofixation on Nanostructured Iron Titanate Films
TL;DR: In this article, a nanostructured iron titanate thin film has been prepared by a sol-gel method from iron(III) chloride and titanium tetraisopropylate.
References
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Journal Article
The structure of pseudorutile and its role in the natural alteration of ilmenite
Ian E. Grey,Alan F. Reid +1 more
TL;DR: In this paper, Dyadchenko and Khatuntseva presented a complete structure analysis on a single crystal of pseudoruti le. The structure is based on hexagonal close-packed oxygens with metal atoms randomized with two thirds occupancy over half the available octahedral sites and fully ordered in the remaining sites.
Journal ArticleDOI
Alteration of ilmenite
TL;DR: In this paper, the authors studied the alteration of heavy-mineral concentrates by means of chemical analysis, optical microscopy, electron microscopy and electron microprobe, and X-ray diffraction.
Journal ArticleDOI
The influence of weathering on the reduction of llmenite with carbon
TL;DR: In this article, the reduction of synthetic ilmenite and three concentrates (Westralian Sands Limited, Western Mineral Sands (WMS), and Florida) with coal at 1000 c to 1100 c was studied using thermogravimetry and X-ray diffraction, optical microscopy, and electron probe microanalysis of the products.
Journal ArticleDOI
Pseudorutile—a New Mineral Intermediate between Ilmenite and Rutile in the N Alteration of Ilmenite
TL;DR: In this paper, a new crystalline phase was identified as a major constituent of altered ilmenite, which crystallizes in a disordered structure of hexagonal symmetry and has the theoretical composition Fe2O3·3TiO2.
Journal ArticleDOI
Shear structure compounds (Cr,Fe)2Tin−2O2n−1 derived from the α-PbO2 structural type
Ian E. Grey,A.F. Reid +1 more
TL;DR: In this paper, the structures of the compounds are closely related to that of α-PbO 2 and may be derived from it by crystallographic shear parallel to (110) α-pbO2.
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