Composition and Morphology of Magnetic Microspheres in Power-Plant Fly Ash of Coal from the Ekibastuz and Kuznetsk Basins
OLGA M. SHARONOVA1, NATALIA N. ANSHITS1, ALEXANDER I. ORUZHEINIKOV2, GALINA V. AKIMOCHKINA3, ALEKSEY N. SALANOV2, ALEXANDER I. NIZOVSKII2, OLGA N. SEMENOVA2 and ALEXANDER G. ANSHITS1
1Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences,
Ul. K. Marxa 42, Krasnoyarsk 660049 (Russia) E-mail: shar@icct.ru
2Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences,
Prospekt Lavrentyeva 5, Novosibirsk 630090 (Russia)
3Krasnoyarsk State Technical University, Ul. Kirenskogo 26, Krasnoyarsk 660074 (Russia)
Pages: 639-648
Abstract
Using a multi-stage scheme including different sequences of the stages of magnetic separation, hydrodynamic and granulometric classification, magnetic microspheres of fixed composition containing the magnetic constituent at the level of 95_99 % were separated from the fly ash of coal from the Ekibastuz and Kuznetsk basins. The yield, texture characteristics, macrocomponent and mineral phase composition were determined and globules of three morphological types were described for close-cut fractions of magnetic microspheres. A general dependence of the properties of close-cut fractions of microspheres on ferric oxide content was revealed. It was demonstrated that for the mass concentration of total Fe2O3 >60 %, mainly massive microspheres with various crystal microstructure are formed. With a decrease in iron content, the formation of porous microspheres becomes predominant. It is established that the governing factor in the formation of microspheres of morphological type is the viscosity of ferriferous silicate melt.
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