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Narrow Dispersed Fractions of High-Calcium Fly Ash Produced from the Pulverized Combustion of Irsha-Borodinsky Coal

  • STEAM BOILERS, POWER-PLANT FUELS, BURNER UNITS, AND BOILER AUXILIARY EQUIPMENT
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Abstract

By means of airflow aerodynamic classification, high-calcium fly ash (with a bulk density of 1.14 g/cm3 and size distribution parameters of dav = 5 µm and d90 = 14 µm) produced from the combustion of Irsha-Borodinsky coal and sampled from the fourth field of the electrostatic precipitator at the Krasnoyarsk TPP-2 has been separated. The obtained morphologically homogeneous fractions of spherical particles with a narrow distribution are characterized by dav = 1, 2, 3, 4, and 10 μm and d90 = 3, 4, 5, 9, and 16 μm. It has been established that the main chemical component of the obtained narrow fractions is represented by CaO with a content of 34–43 wt %; the content of the other components is as follows: 15–34 wt % of SiO2, 13–16 wt % of Fe2O3, 9–10 wt % of MgO, 8–10 wt % of Al2O3, 2–10 wt % of SO3. The phase composition has 35–49 wt % of crystalline calcium-containing compounds, including 11–15 wt % of aluminum substituted calcium ferrite and 8–11 wt % of tricalcium aluminate, which are the main phases of Portland cement. The content of crystalline quartz amounts to 2–7 wt %, and that of the amorphous glass phase is 41–51 wt %. It has been established that, as the average fraction size dav obtained after the aerodynamic separation of ash increases from 1 to 10 μm, the bulk ash density exhibits an increase from 0.89 to 1.50 g/cm3 and the content of the magnetic component also increases, amounting up to 4 wt %. At the same time, the chemical composition of the fractions exhibits an increase in the content of SiO2 as well as a decrease in the content of Al2O3 and SO3. The content of СаО and Fe2O3 in the fractions having dav = 1–3 μm increases, then it exhibits an abrupt decrease with increasing particle size. As far as the phase composition is concerned, an increase in the content of crystalline quartz is observed, and the total fraction of calcium-containing phases gradually decreases. At the same time, the percentage of calcium sulfate decreases and the percentage of free calcium oxide exhibits a considerable increase. The content of calcium hydroxide increases in the fractions having dav = 1–2 μm and then decreases with increasing particle size.

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Notes

  1. Conventional aggregates are usual aggregares for concrete according to the requirements of ASTM C33.

  2. Recycled glass aggregate is a product consisting of fragmented glass production waste or domestic glass.

  3. d40 = 10 μm—the index in the diameter designation shows the fraction of particles whose size is less than 10 μm (in this case, 40%).

  4. SEM is scanning electron microscopy.

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ACKNOWLEDGMENTS

We are grateful to the researchers of the Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences L.A. Solov’ev for performing the quantitative XRD phase analysis and for interpreting the results and A.V. Antonov for imaging with the use of a TM-3000 scanning electron microscope.

Funding

This study was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science (project no. 18-43-240002 Development of lightweight high-strength proppants based on microsphere narrow fractions of coal fly ash) and the Siberian Branch of the Russian Academy of Sciences (project no. V.45.3.3 Formation of new functional microspherical and composite materials with desired properties).

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Authors and Affiliations

  1. Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Federal Research Center “Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences,”, 660036, Krasnoyarsk, Russia

    E. V. Fomenko, G. V. Akimochkina & A. G. Anshits

  2. Siberian Federal University, 660041, Krasnoyarsk, Russia

    A. G. Anshits

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  1. E. V. Fomenko
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  2. G. V. Akimochkina
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  3. A. G. Anshits
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Correspondence to E. V. Fomenko.

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Translated by O. Polyakov

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Fomenko, E.V., Akimochkina, G.V. & Anshits, A.G. Narrow Dispersed Fractions of High-Calcium Fly Ash Produced from the Pulverized Combustion of Irsha-Borodinsky Coal. Therm. Eng. 66, 560–568 (2019). https://doi.org/10.1134/S0040601519080020

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