The Composition and Origin of PM 1-2 Microspheres in High-Calcium Fly Ash from Pulverized Lignite Combustion

Elena Fomenko, Natalia Anshits, Galina Akimochkina, Leonid Solovyov, Sergey Kukhteskiy and Alexander Anshits
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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

Energies, 2022, vol. 15, issue 15, 1-15

Abstract: This article presents the results of a systematic study on the composition and origin of PM 1-2 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: [SiO 2 + Al 2 O 3 ] = 88.80 − 1.02 [CaO + Fe 2 O 3 + 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, SiO 2 + Al 2 O 3 ≤ 35, Fe 2 O 3 < 23, MgO < 16 wt %); Group 2 (30 < CaO < 40, SiO 2 + Al 2 O 3 ≤ 40, Fe 2 O 3 < 27, MgO < 21 wt %); Group 3 (CaO ≤ 30, 40 ≤ SiO 2 + Al 2 O 3 ≤ 75, Fe 2 O 3 < 10, MgO < 10 wt %); and Group 4 (14 < CaO < 40, SiO 2 + Al 2 O 3 < 14, Fe 2 O 3 > 30, MgO ≤ 14 wt %). A comparative analysis of the relationship between major component concentrations suggests the routes of PM 1-2 formation from feldspars and Ca–, Mg–, and Fe–humate complexes during lignite combustion.

Keywords: particulate matter; microsphere; fly ash; SEM-EDS; mineral precursor; lignite (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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