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Fe2O3 Particles (fe2o3 + particle)
Selected AbstractsSolid-Solution Formation in the Synthesis of Fe-ZirconJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 4 2004Enrique Carreto Cortés To investigate solid-solution formation in the iron-doped silicate (zircon) system, different samples were prepared by the ceramic method with addition of LiF as a mineralizer. The results of X-ray powder diffraction (XRD), 57Fe Mössbauer, and UV,visible spectroscopy showed that in the as-prepared samples, only a small fraction of iron, i.e., about 2.5 mol%, is hosted in the zircon structure as paramagnetic Fe3+ species, while the remaining Fe3+ cations form magnetic ,-Fe2O3 particles that are trapped in the zircon matrix. [source] Synthesis Mechanism of an Iron,Chromium Ceramic PigmentJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 1 2000Agustín Escardino The synthesis of a black Fe2O3,Cr2O3 pigment has been studied to better understand the synthesis mechanism. A mechanism is proposed according to which, under the tested operating conditions, one of the starting constituents (Cr2O3) is transferred, largely in a gas phase (after subliming), to the particle surface of the other constituent (Fe2O3), at which it is deposited or chemisorbed, forming a layer from which it diffuses inward into the Fe2O3 particles. The process stops when the composition of the resulting solid solution has become uniform. [source] Numerical Calculations of Spray Roasting Reactors of the Steel Industry with Special Emphasis on Fe2O3 -Particle FormationCHEMICAL ENGINEERING & TECHNOLOGY (CET), Issue 10 2007M. Beck Abstract This work presents numerical calculations for the lay-out of spray roasting reactors for the steel industry. In these reactors, a pickling liquor based on water and HCl containing FeCl2 is regenerated in a combustor leading to the formation of Fe2O3 particles. For the lay-out of these reactors, detailed knowledge of the flow and temperature field, the associated gas phase reactions, and especially, of the formation of the Fe2O3 particles is required. An extended particle formation model is presented which is based on earlier work. Finally, results for an industrial spray roasting reactor are given showing the potential of the numerical tools developed for the improvement of the technical lay-out of such thermal reactors. [source] Environmentally friendly coloured materials: cellulose/titanium dioxide/inorganic pigment composite spherical microbeads prepared by viscose phase-separation methodCOLORATION TECHNOLOGY, Issue 6 2007Shoji Nagaoka In order to develop environmentally friendly coloured materials, cellulose composite spherical microbeads hybridised with titanium dioxide (TiO2) particles and inorganic pigment were prepared by a phase-separation method using viscose and an aqueous solution containing sodium polyacrylate. Findings regarding the relationships between cellulose xanthate and the electronic characteristics of TiO2 particles used in the cellulose/inorganic material composite sphering process are also reported. These findings suggest that the location of TiO2 particles in cellulose microbeads is related to electrical repulsion between the xanthate (CSS,) group and TiO2. The use of TiO2 powder as colour pigment is limited, as its colour is white. The cellulose composite spherical microbeads covered with TiO2 and Fe2O3 particles were developed by addition of iron oxide (Fe2O3). Their surfaces were viewed by laser microscope and using SEM images. These composite microbeads retained the photocatalytic property of TiO2. Cellulose/TiO2/Fe2O3 composite spherical microbeads with both colour function and photocatalytic properties were successfully prepared. [source] | ||||||||||