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Improving the technology of extracting coal concentrate from fly ash from thermal power plants

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Category: Content №4 2023

Last Updated on 28 August 2023

Published on 30 November -0001

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Authors:

M.Hlukhoveria*, orcid.org/0000-0001-6099-0219, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

I.Mladetskyi, orcid.org/0000-0002-6159-6819, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

K.Levchenko, orcid.org/0000-0003-0596-0898, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.Borysovska, orcid.org/0000-0001-7309-0236, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2023, (4): 033 - 039

https://doi.org/10.33271/nvngu/2023-4/033

Abstract:

Purpose. Study on the possibility of extracting coal underfire particles from the ash of the thermal power station by flotation. Intensification of the enrichment process of coal particles, development of a mathematical model for forecasting indicators of the ash function.

Methodology. The method of fractional flotation was used to study the kinetics of the process of extraction of the valuable component. The technique of the planned experiment was applied, including the central composite rotatable plan of the second order for four factors affecting the ash content of the coal concentrate.

Findings. According to fractional analysis, the concentration limit of coal particles was determined. During the flotation of fly ash, the best results were obtained on the EFM ejector type flotation machine, the yield of the foam product was 18.6 % with an ash content of 25.1 %, compared to the MFU mechanical type flotation machine, where the ash content of the foam product was 36.5 % with an average yield of 21.1 %. The optimal consumption of reagents at the level of no more than 3,500 g/t of the collector and foaming agent up to 250 g/t was determined experimentally, and the required flotation time was determined. Calculations were performed to determine regression coefficients and the degree of influence of factors on the flotation process. A mathematical model of the flotation process of TPP ash removal was determined, which characterizes the influence of the main factors. The graphs of the significance of the factors and the three-dimensional surface of the calculated response function were drawn up.

Originality. The degree of influence of factors such as pulp pressure in the feed pipeline, collector consumption, foaming agent consumption, and flotation time on the process of beneficiation of TPP ash on the EFM ejector type flotation machine was determined.

Practical value. The complex model makes it possible to predict the final indicators of the response function, namely the ash content of the secondary coal concentrate. The results will make it possible to improve the parameters of technological processes for the enrichment of TPP ashes.

Keywords: ash removal, thermal power plants, ash slag waste, coal concentrate, flotation

References.

1. European Business Association (2021). The use of ash and slag in road construction. European experience and perspectives for Ukraine. Retrieved from https://eba.com.ua/en/eva-prezentuvala-doslidzhennya-shhodo-vykorystannya-zoloshlakiv-u-dorozhnomu-budivnytstvi/.

2. Sklyar, L. V. (2016). Ash and slag enrichment technology of Zelenodolska TPP with production of aluminosilicate microspheres. Zbahachennia korysnykh kopalyn, 63(104), 36-46.

3. Bereznyak, A. A., Dreshpak, A. S., & Hlukhoveria, N. R. (2019). Research into the enrichment of fly ash from thermal power plants on a pneumatic flotation machine of the “Jameson cell” type. Zbahachennia korysnykh kopalyn, 74(115), 62-69.

4. Hlopitskiy, A. A., & Makarchenko, N. P. (2013). Prospects of utilizing ashes and slag waste of thermal power plants. Universum: tehnicheskie nauki: elektronnyy nauchnyy zhurnal, 1(1). Retrieved from https://7universum.com/ru/tech/archive/item/790.

5. Ryabov, Yu., Delitsyn, L., & Ezhova, N. (2016). Flotation recovery of carbon from fly ash of coal-fired power plants using mix of kerosene with gasoil. Obogashchenie Rud, (5). https://doi.org/10.17580/or.2016.05.09.

6. Zhang, H., Liu, J., Wang, Yo., Cao, Yi., Ma, Z.-L., & Li, X. (2013). Cyclonic-static micro-bubble flotation column. Minerals Engineering, (45), 1-3. https://doi.org/10.1016/j.mineng.2013.01.006.

7. Zhang, W., & Honaker, R. (2015). Studies on carbon flotation from fly ash. Fuel processing technology, (139), 236-241. https://doi.org/10.1016/j.fuproc.2015.06.045.

8. Zhang, H., Xu, M., Liu, Ch., Yi Ru, Li, G., & Cao, Yi. (2017). A comparison of removal of unburned carbon from coal fly ash using a traditional flotation cell and a new flotation column. Physiochemical problems of mineral processing, (1), 628-643. https://doi.org/10.5277/ppmp170149.

9. Sahbaz, O., Cinar, M., & Kelebek, S. (2016). Analysis of flotation of unburned carbon from bottom ashes. Acta Montanistica Slovaca, 21(2), 93-101. Retrieved from https://actamont.tuke.sk/pdf/2016/n2/2sahbaz.pdf.

10. Hadbaatar, A., Mashkin, N. A., & Stenina, N. G. (2016). Study of ash-slag wastes of electric power plants of Mongolia applied to their utilization in road construction. Procedia Engineering, (150), 1558-1562. https://doi.org/10.1016/j.proeng.2016.07.111.

11. Cao, Y. J., Li, G. S., Liu, J. T., Zhang, H. J., & Zhai, X. (2012). Removal of unburned carbon from fly ash using a cyclonic-static microbubble flotation column. South African Institute of Mining and Metallurgy, 112(10), 891-896. Retrieved from http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S2225-62532012001000010.

12. Statgraphics Centurion 19 (2023). Retrieved from https://www.statgraphics.com/centurion-overview.

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