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