Composition, Structure, and Formation Routes of Blocklike Ferrospheres Separated from Coal and Lignite Fly Ashes | Научно-инновационный портал СФУ

Composition, Structure, and Formation Routes of Blocklike Ferrospheres Separated from Coal and Lignite Fly Ashes

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1021/acs.energyfuels.9b04034

Аннотация: The structure-composition relationship of blocklike ferrospheres (FSs) isolated from fly ash from the coal and lignite combustion has been studied systematically by scanning electron microscopy and energy dispersive X-ray spectroscopy. Groups of globules for which the gross composition of polished sections corresponds to the general equations for the relationship of the concentrations SiO2 = f(Al2O3) and CaO = f(SiO2) are highlighted from FSs of two series. It is shown that blocklike FSs are formed during the sequential transformation of dispersed products of thermal conversion of mineral precursor associates: pyrite, quartz, and Ca, Al-humates in the case of brown coal; and pyrite, siderite, quartz, and calcite in the case of coal. Anorthite is the aluminosilicate precursor of blocklike FSs of both series. The dependence CaO = f(SiO2) that reflects the influence of glass-forming components reveals six groups of FSs. An analysis of SEM images of polished globule sections demonstrates that an increase in the concentration of glass-forming components in all groups is accompanied by gradual changes in the structure of globules, from a large blocklike type to a fine crystalline type with a high glass-phase content. The size and shape of crystallites are controlled by the size of a local melt area where the total concentration of spinel-forming oxides exceeds 85 wt %. An increase in the glass-phase concentration and a decrease in the crystallite size in globules with FeO ≤ 46-50 wt % are explained by expansion of the segregation region in the FeO-Fe2O3-SiO2 system as the oxidation potential rises. © 2020 American Chemical Society.

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Издание

Журнал: Energy and Fuels

ISSN журнала: 08870624

Авторы

  • Anshits N.N. (Federal Research Center Krasnoyarsk Science Center SB RAS, Institute of Chemistry and Chemical Technology SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation)
  • Fedorchak M.A. (Federal Research Center Krasnoyarsk Science Center SB RAS, Institute of Chemistry and Chemical Technology SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation)
  • Fomenko E.V. (Federal Research Center Krasnoyarsk Science Center SB RAS, Institute of Chemistry and Chemical Technology SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation)
  • Mazurova E.V. (Federal Research Center Krasnoyarsk Science Center SB RAS, Institute of Chemistry and Chemical Technology SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation)
  • Anshits A.G. (Federal Research Center Krasnoyarsk Science Center SB RAS, Institute of Chemistry and Chemical Technology SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation, Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk, 660041, Russian Federation)

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