The Composition and Origin of PM<sub>1-2</sub> Microspheres in High-Calcium Fly Ash from Pulverized Lignite Combustion
Elena Fomenko,
Natalia Anshits,
Galina Akimochkina,
Leonid Solovyov,
Sergey Kukhteskiy,
Alexander Anshits
Affiliations
Elena Fomenko
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
Natalia Anshits
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
Galina Akimochkina
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
Leonid Solovyov
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
Sergey Kukhteskiy
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
Alexander Anshits
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
This article presents the results of a systematic study on the composition and origin of PM1-2 microspheres in high-calcium fly ash. The composition of individual microspheres was studied by scanning electron microscopy and energy-dispersive X-ray spectroscopy. It is shown that the compositions of the analyzed microspheres satisfy the general dependency with a high correlation coefficient: [SiO2 + Al2O3] = 88.80 − 1.02 [CaO + Fe2O3 + MgO], r = −0.97. The formation pathway is parallel to the general trend: anorthite, gehlenite, esseneite, tricalcium aluminate, ferrigehlenite, and brownmillerite. The microspheres were classified into four groups depending on the content of major components: Group 1 (CaO > 40, SiO2 + Al2O3 ≤ 35, Fe2O3 2 + Al2O3 ≤ 40, Fe2O3 2 + Al2O3 ≤ 75, Fe2O3 2 + Al2O3 2O3 > 30, MgO ≤ 14 wt %). A comparative analysis of the relationship between major component concentrations suggests the routes of PM1-2 formation from feldspars and Ca–, Mg–, and Fe–humate complexes during lignite combustion.
