Chemical characterization of density separated submicrometer coal fly ash |
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Authors: | Kiichiro Mukai Tadashi Kikuchi Keiichi Furuya |
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Institution: | (1) Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, 162 Tokyo, Japan |
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Abstract: | A new geometrical particle size separation method in the range of submicrometer has been developed for coal fly ash. Coal fly ash particles prefractionated less than 5 m in geometrical diameter were fractionated with a coupling of supersonical dispersion in methyl alcohol and filtration through antistatic Nucleopore filter into >1.0, 1.0–0.8, 0.8–0.6 m.Submicrometer (1.0–0.6 m) and micrometer coal fly ash (25–20 m) were separated into six density fractions and their compositions measured by SEM-EDX were compared. For the both size fractions, for the low density fractions (<2.8 g/cm3) consisted mainly of aluminosilicates and the fractions of 2.8–3.2 g/cm3 consisted of oxides of aluminum, silicon and calcium, and in the fraction above 3.2 g/cm3 iron was rich. In submicrometer fly ash, phosphor and sulfur concentrated to the particles rich in calcium. In the heaviest fraction, the particles containing over 30 wt% titanium as oxide observed among the particles rich in iron. These fractions were revealed not as a single component, but as mixtures of several components. |
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Keywords: | submicrometer coal fly ash SEM-EDX analysis geometrical size separation density separation |
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