Relationship between composition and structure of globules in narrow fractions of ferrospheres

Тип публикации: статья из журнала

Год издания: 2013

Идентификатор DOI: 10.1016/j.fuel.2013.03.059

Ключевые слова: Fly ash, Ferrospheres, Narrow fraction, Composition, Structure, Composition, Ferrospheres, Fly ash, Narrow fraction, Structure, Correlation coefficient, Ferrospheres, Iron concentrations, Linear regression equation, Narrow fractions, Stoichiometric magnetite, Structural characteristics, Unit cell parameters, Aluminum, Chemical analysis, Fly ash, Iron, Iron oxides, Structure (composition)

Аннотация: A systematic study has been carried out on the relationship between the composition, morphology, and structural characteristics of iron-containing phases of 25 narrow fractions of ferrospheres with the Fe2O3 content in the range 30-92 wt.%, which are separated from four known (S, FS, CS, and FCS) types of fly ashes. It has been established that the compositions of the major components of all the studied narrow fractions of ferrospheres and magnetic concentrates obtained from 17 power plants in Russia, Ukraine, and Kazakhstan are described by two general linear regression equations [SiO2] = 65.71-0.71 center dot[Fe2O3] and [Al2O3] = 24.92-0.26 center dot[Fe2O3] with the correlation coefficients of -0.99 and -0.97, respectively. In the general dependence of the ferrosphere composition, there are two regions differing in the properties of the melt from which the ferrospheres are formed. In a wide range of the Fe2O3 content variations from 30 to 79 wt.%, the behavior of the melt is determined by the properties of the FeO-SiO2-Al2O3 system. This system is characterized by the formation of an aluminum-magnesium-ferrite spinel. The content of the spinel increases with increasing iron concentration, and the unit cell parameter of the spinel also increases in the range from 8.3440 to 8.3897 angstrom. The unit cell parameters of the alpha-Fe2O3 phase are substantially smaller than those of stoichiometric hematite. For a higher Fe2O3 content (> 83 wt.%) and a low Al2O3 content (

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Издание

Журнал: FUEL

Выпуск журнала: Vol. 111

Номера страниц: 332-343

ISSN журнала: 00162361

Место издания: OXFORD

Издатель: ELSEVIER SCI LTD

Авторы

  • Sharonova O.M. (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)
  • Anshits A.G. (Siberian Federal University)
  • Salanov A.N. (Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences)

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