Composition of Individual Microspheres in a Finely Dispersed Fraction from Fly Ash after the Pulverized Combustion of Ekibastuz Coal.

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.A systematic study of the compositions of individual microspheres with sizes of 90 wt % and FeO 90 wt % and FeO = 3–6 wt %. Mineral precursors of microspheres of group (3), SiO2 + Al2O3 < 90 wt % and FeO to 11 wt %, were mixed-layer illite–montmorillonites with a high degree of cationic substitution with iron and Fe3+ included into interlayer sites

Composition and Structure of the Shells of Aluminosilicate Microspheres in Fly Ash Formed on the Combustion of Ekibastuz Coal

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.A systematic study of the chemical and phase composition and structure of the shells of narrow fractions of nonmagnetic cenospheres separated from a concentrate of fly ash cenospheres from the combustion of pulverized SS (weakly caking coal) coal from the Ekibastuz Basin was carried out. It was found that the separated narrow fractions were characterized by a high Al2O3content of 33–38 wt %. The phase composition included 57–73 wt % vitreous phase, 25–40 wt % mullite, and 1.2–2.5 wt % quartz. An increase in the average diameter, thickness, and porosity of the glass-crystalline shell of globules with the concentration of aluminum was observed. Globules of the following two types were identified in the obtained fractions: spherical globules with an annular structure and foamy globules with a network structure formed from different illite and kaolinite mineral precursors, respectively

Composition and Structure of the Shells of Aluminosilicate Microspheres in Fly Ash Formed on the Combustion of Ekibastuz Coal

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.A systematic study of the chemical and phase composition and structure of the shells of narrow fractions of nonmagnetic cenospheres separated from a concentrate of fly ash cenospheres from the combustion of pulverized SS (weakly caking coal) coal from the Ekibastuz Basin was carried out. It was found that the separated narrow fractions were characterized by a high Al2O3content of 33–38 wt %. The phase composition included 57–73 wt % vitreous phase, 25–40 wt % mullite, and 1.2–2.5 wt % quartz. An increase in the average diameter, thickness, and porosity of the glass-crystalline shell of globules with the concentration of aluminum was observed. Globules of the following two types were identified in the obtained fractions: spherical globules with an annular structure and foamy globules with a network structure formed from different illite and kaolinite mineral precursors, respectively