Composition and Morphology Of Fly Ash Cenospheres Produced from the Combustion of Kuznetsk Coal

Тип публикации: статья из журнала

Год издания: 2013

Идентификатор DOI: 10.1021/ef400754c

Ключевые слова: Aluminum concentration, Chemical and phase compositions, Crystalline quartz, Degree of substitution, Fly ash cenospheres, Heterogeneous region, Iron concentrations, Pulverized combustions, Aluminum, Coal ash, Crystalline materials, Fly ash, Morphology, Porosity, Quartz, Shells (structures), Silicate minerals, Coal combustion

Аннотация: The chemical and phase composition, morphology, and shell structure of narrow fractions of nonmagnetic and magnetic low-density nonperforated cenospheres separated from fly ash concentrates produced via the pulverized combustion of coal from the Kuznetsk Basin (Russia) have been studied. Narrow fractions of nonmagnetic cenospheres contain 2.6-3.5 wt % Fe2O3 and include globules with a uniform smooth or relief surface and shells with different degrees of porosity. For nonmagnetic cenospheres, the aluminum concentration increase leads to an increase in the mullite phase content and a decrease in the average sphere diameter, glass-crystalline shell thickness and porosity, and the crystalline quartz content. The quartz phase comprises two modifications with different lattice parameters. The narrow fractions of magnetic cenospheres contain 3-21 wt % Fe2O3 and include globules with thick porous shells covered by heterogeneous regions of ferrospinel on their outer surface. In magnetic cenospheres, an increase in the iron concentration leads to an increase in the ferrospinel phase content and crystallite size, accompanied by a decrease in the degree of substitution of magnesium and aluminum for iron.

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Издание

Журнал: ENERGY & FUELS

Выпуск журнала: Vol. 27, Is. 9

Номера страниц: 5440-5448

ISSN журнала: 08870624

Место издания: WASHINGTON

Издатель: AMER CHEMICAL SOC

Авторы

  • Fomenko E.V. (Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences)
  • Anshits N.N. (Siberian Federal University)
  • Solovyov L.A. (Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences)
  • Mikhaylova O.A. (Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences)
  • Anshits A.G. (Siberian Federal University)

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