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Power engineering and ecology
ArticleName The technology of processing CHP-plant ash and slag wastes with obtaining ferrous raw materials for steel and iron industry
ArticleAuthor V. V. Vlasova, E. Yu. Fomina

Irkutsk National Research Technical University (Irkutsk, Russia):

V. V. Vlasova, Cand. Eng., Associate Prof., Dept. of Mineral Processing and Environment Protection, E-mail:
E. Yu. Fomina, Cand. Eng., Associate Prof., Dept. of Mineral Processing and Environment Protection


Today the problem of ash-waste storage and low level of ashwaste treatment affects the efficiency of energy economic, because landfills of ash waste needs a proper technological maintenance and large financial supplies. It seems to be a hard task for energy industry to reduce this item of expenses because of the risks of negative effects to environment. The possible solution can be found in wide using of ash and slag waste in the national economy. This article provides the results of developing a technology of extraction of valuable components (in particular – iron) from ash and slag waste of thermal power plants of the Irkutsk region (CHP-9 in Angarsk, NI CHP in Irkutsk). The technological scheme includes preliminary screening to class 1.25 mm, classifi cation and wet magnetic separation. This scheme allows to obtain a concentrate with content of Fe2O3: 58.23% for material from CHP-9 and 67.61% for material from NI CHP. According to composition and properties of the obtained magnetite concentrates, we can suggest the directions of their use. One of the possible use is the complete or partial replacement of natural magnetite or other secondary materials (scrap, crushed scale) in the smelting of steel, iron, cast iron and ferroalloys. The experimental smelting of pre-briquetted charge proved the possibility of smelting the cast iron from iron-containing concentrate separated from ash and slag waste from NI CHP. The cast iron smelted within the experiment can be defi ned as cast iron of brand P2 that are commonly used in steelmaking processes. This result proves the possibility of using ash and slag waste as an alternative replacement to natural resources.

keywords Ash and slag waste, landfills of ash and slag waste of thermal power plants, processing technology, extraction of valuable components, iron-containing concentrates, magnetic separation, classification, tails, cast iron

1. Mongush G. R., Kotelnikov V. I., Barinov А. V. Utilization of ash and slag wastes of the coal combustion process in the Ulug-Khem basin of the Tyva Republic. Sovremennye naukoemkie tekhnologii. Regionalnoe prilozhenie. 2016. No. 4 (48). pp. 112–120.
2. Fedorov N. V., Shaforost D. А. Prospects for the use of fly ash from thermal power plants of the Rostov region. Teploenergetika. 2015. No. 1. pp. 53–58.
3. Delitsyn L. М., Vlasov А. S. The need for new approaches to the use of TPP coal ash. Teploenergetika. 2010. No. 4. pp. 49–55.
4. Delitsyn L. М., Ryabov Yu. V., Vlasov А. S. Novel concentrating technology for processing ash of coal-fired power plants to produce alumina and other commercial products. Ekologiya promyshlennogo proizvodstva. 2012. Iss. 1. pp. 74–79.
5. Ryabov Yu. V., Delitsyn L. М., Vlasov А. S., Golubev Yu. N. Obtaining magnetic products from Kashira TPP fl y ash. Obogashchenie rud. 2013. No. 6. pp. 41–45.

6. Butorina I. V., Butorina М. V. Review of wsates utilization technologies in mining and metallurgical industry. Chernye Metally. 2018. No. 12. pp. 44–49.
7. Meawad A. S., Bojinova D. Y., Pelovski Y. G. An overview of metals recovery from thermal power plant solid wastes. Waste Management. 2010. No. 30(12), pp. 2548–2559.
8. Samorokov V. E., Zelinskaya Е.V., Tolmacheva N. А., Barakhtenko V. V., Burdonov А. Е., Pronin S. А., Vlasova К. I., Golovina А. V. Composite materials based on aluminosilicate microspheres in mechanical engineering. Sprovochnik. Inzhenerny zhurnal s prilozheniem. 2015. No. 1(214). pp. 3–6.
9. Rimkevich V. S., Pushkin А.А., Churushova О. V. Integrated processing of CHP coal ash. Gornyi informatsionno-analiticheskiy byulleten (nauchno-tekhnichesky zhurnal) / Khimiya. 2015. No. 6. pp. 250–259.
10. Höllen D., Berneder I., Capo Tous F., Stöllner M., Philipp Sedlazeck K., Schwarz T., Aldrian A., Lehner M. Stepwise treatment of ashes and slags by dissolution, precipitation of iron phases and carbonate precipitation for production of raw materials for industrial applications. Waste Management. 2018. August. Vol. 78. pp. 750–762
11. Merkusheva L. N., Voronchikhina V. V., Kurguzkina Т. I., Udovitsky V. I., Nifantov B. F. Investigation of the possibility of separation of small chemical elements (SCE) from coal and its combustion products. Chemistry and chemical technology: Proceedings of Kuzbass State University. Kemerovo, 1995. pp. 97–103.
12. Adeeva L. N., Borbat V. F. CHP coal ash is a promising raw material for industry. Vestnik Omskogo universiteta. 2009. No. 2. pp. 141–151.
13. Leonov S. B., Fedotov К. V., Senchenko А. Е. Industrial gold mining from ash dumps of thermal power plants. Gornyi Zhurnal. 1998. No. 5. pp. 67–68.
14. Vlasova V. V., Fedotov К. V., Artemova О. S. et. al. On the possibility of separating coal underburning from power system wastes: Proceedings of the scientific and practical conference “Prospects for development of technology, ecology and automation of chemical, food and metallurgical production”. Irkutsk: Izdatelstvo IrGTU, 2007. pp. 21–22.
15. Mushtaq F., Zahid M., Bhatti I.A., Nasir S., Hussain T. Possible applications of coal fl y ash in wastewater treatment. Journal of Environmental Management. 2019. No. 240. pp. 27–46.
16. Malykhin R. N., Afi nogenov О. P. The use of ash and slag wastes to strengthen the soil in the conditions of the Kemerovo region. Molodoy uchenyi. 2019. No. 11. pp. 20–23.
17. Kuyvasheva А. V., Stepanets V. G. The use of ash-mineral mixtures in the pavement bases during the reconstruction of Lenin street. Molodoy uchenyi. 2016. No. 12. pp. 306–311.
18. Cherepanov А. А., Kardash V. Т. Complex processing of CHP ash and slag wastes (results of laboratory and semi-industrial tests). Geologiya i poleznye iskopaemye mirovogo okeana. 2009. No. 2. pp. 98–115.
19. Wang Z.-G., Kong L.-X., Bai J., Li H.-Z., He C., Yan T.-G., Guo Z.-X., Bai Z.-Q., Li W. Effect of vanadium and nickel on iron-rich ash fusion characteristics. Fuel. 2019. June. pp. 491–499.
20. Fedotov К. V., Vlasova V. V., Artemova О. S. et. al. Technology for producing iron-containing concentrates from heat and power industry wastes: proceedings of scientific and practical conference Prospects for development of technology, ecology and automation of chemical, food and metallurgical production. Irkutsk: izdatelstvo IrGTU, 2007. pp. 23–25.
21. Sedykh V. I., Sobolev S. А., Garashik Е. А., Vlasova V. V. On the possibility of combine utilization of wastes from aluminum and electric power industry. Proceedings of the IV Republic scientific and technical conference of young scientists and specialists in the aluminum and electrode industry (26–27 October 2006). Irkutsk: izdatelstvo IrGTU, 2006. pp. 66–69.
22. GOST 805–95. Steelmaking pig iron. Specifi cations. Introduced: 01.01.2000.
23. Schliephake H., Endemann G. Are resource efficiency and circular economy politically desirable? Chernye Metally. 2017. No. 3. pp. 58–64.
24. Temnikov V. V., Kalimulina Е. G., Tleugabulov B. S. Analysis of formation and processing of metallurgical wastes at “EVRAZ NTMK” JSC. Chernye Metally. 2018. No. 7. pp. 32–37.

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