Title: Composition, morphology, properties of coal fly ash microspheres and their application for conditioning liquid radioactive waste

Authors: N.N. Anshits, A.N. Salanov, T.A. Vereshchagina, D.M. Kruchek, O.A. Bajukov, A.A. Tretyakov, Yu.A. Revenko, A.G. Anshits

Addresses: Institute of Chemistry and Chemical Technology, SB RAS (ICCT SB RAS), Krasnoyarsk, Russia. ' G.K. Boreskov's Institute of Catalysis SB RAS (IC SB RAS), Novosibirsk, Russia. ' Institute of Chemistry and Chemical Technology, SB RAS (ICCT SB RAS), Krasnoyarsk, Russia. ' Federal State Unitary Enterprize 'Mining Chemical Combine' (MCC), Zheleznogorsk, Russia. ' L.B. Kirenskii Institute of Physics SB RAS (IP SB RAS), Krasnoyarsk, Russia. ' Federal State Unitary Enterprize 'Mining Chemical Combine' (MCC), Zheleznogorsk, Russia. ' Federal State Unitary Enterprize 'Mining Chemical Combine' (MCC), Zheleznogorsk, Russia. ' Institute of Chemistry and Chemical Technology, SB RAS (ICCT SB RAS), Krasnoyarsk, Russia

Abstract: Using methods of the Mossbauer spectroscopy, scanning electron microscopy, and thermodynamic analysis of phase formation in silicate multi-component melts, the detailed study of composition, morphology, and properties of fly ash microspheres resulting from combustion of three coals (Irsha-Borodinskii, Kuznetskii and Ekibastuzskii) was carried out. About 60 microspherical products with an iron content of 2–94 wt.% Fe₂O₃ were obtained. The ranges of microsphere composition, suitable for liquid radioactive waste solidification in the forms of iron phosphate (36–94 wt.% Fe₂O₃) and aluminosilicate (2–20 wt.% Fe₂O₃) ceramics were determined. The possibility of producing porous materials and specific microspherical sorbents, based on coal fly ash cenospheres and their application for mmobilisation of liquid radioactive waste solidification was demonstrated.

Keywords: fly ash microspheres; cenospheres; liquid radioactive waste; porous matrices; microspherical sorbents; AMP/cenospheres; coal fly ash; phase formation; silicate multi-component melts; nuclear waste; nuclear power; nuclear technology; nuclear energy; nuclear science; solidification; iron phosphate; spent nuclear fuel; aluminosilicate; glass crystalline microspheres.

DOI: 10.1504/IJNEST.2006.010643

International Journal of Nuclear Energy Science and Technology, 2006 Vol.2 No.1/2, pp.8 - 24

Published online: 10 Aug 2006 *

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