Structure-Composition Relationship of Skeletal and Dendritic Ferrospheres Isolated from Calcium-Rich Power Plant Ash

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1134/S0020168518030032

Ключевые слова: skeletal and dendritic ferrospheres, formation paths

Аннотация: This paper presents a systematic SEM-EDS study of polished sections of individual skeletal and dendritic ferrospheres in the-0.04 + 0.032 mm size fraction, isolated from fly ash from the combustion of brown coal from the Berezovskoe field. The ferrospheres are characterized by a wide range of variations in the macrocomponent composition of local areas. We have identified groups of globules whose overall composition as well as the composition of local areas on their polished sections can be represented by general equations for component concentrations: SiO2 = f(FeO), SiO2 = f(Al2O3), and CaO = f(SiO2). Such equations make it possible to identify the nature of the mineral precursors involved in the formation of the globules. FeO-rich skeletal ferrospheres with low CaO concentration originate from the thermochemical transformation of pyrite and illite associates. Skeletal and dendritic ferrospheres with monotonically increasing CaO and SiO2 concentrations are formed from pyrite and montmorillonite associates, with the participation of a melt containing quartz and decomposition products of Ca-humates of the initial coal. Skeletal and dendritic spinel ferrite crystallization is due to a magnesium aluminate spinel "seed," resulting from the thermal transformation of illite and montmorillonite from the parent coal. The observed increase in glass phase concentration and the change from the skeletal type of crystallization to a dendritic in the ferrospheres containing = 6.5 wt % CaO are due to the low concentration of the spinel-forming cations Fe2+ and Fe3+ in the melt and the increase in the percentage of [Fe3+O2](-) and [Fe-2 (3+) O-5](4-) ferrite complexes with an increase in the degree of oxidation of the melt.

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Издание

Журнал: INORGANIC MATERIALS

Выпуск журнала: Vol. 54, Is. 3

Номера страниц: 253-260

ISSN журнала: 00201685

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Anshits N.N. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Fed Res Ctr,Krasnoyarsk Sci Ctr SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
  • Fedorchak M.A. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Fed Res Ctr,Krasnoyarsk Sci Ctr SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
  • Zhizhaev A.M. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Fed Res Ctr,Krasnoyarsk Sci Ctr SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
  • Anshits A.G. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Fed Res Ctr,Krasnoyarsk Sci Ctr SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodnyi Pr 79, Krasnoyarsk 660041, Russia)

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