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Chemical characterization of density separated submicrometer coal fly ash

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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 5μm 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, 0.8−0.6μm.

Submicrometer (1.0−0.6μm) and micrometer coal fly ash (25−20μm) 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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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, 162, Tokyo, Japan

    Kiichiro Mukai, Tadashi Kikuchi & Keiichi Furuya

Authors
  1. Kiichiro Mukai
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  2. Tadashi Kikuchi
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  3. Keiichi Furuya
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Mukai, K., Kikuchi, T. & Furuya, K. Chemical characterization of density separated submicrometer coal fly ash. Mikrochim Acta 96, 41–56 (1988). https://doi.org/10.1007/BF01236091

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  • DOI: https://doi.org/10.1007/BF01236091

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