OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 1 2024 Study of the eff ect of a combined modifi er from silicon production waste on the properties of gray cast iron Antonina Karlina 1, a, *, Viktor Kondratiev 2, b, Ivan Sysoev 3, c, Aleksandr Kolosov 4, d, Marina Konstantinova 3, e, Elena Guseva 3, f 1 National Research Moscow State University of Civil Engineering, 26 Yaroslavskoe Shosse, Moscow, 129337, Russian Federation 2 A.P. Vinogradov Institute of Geochemistry of the Siberian Branch of the Russian Academy of Sciences, 1A Favorsky str., Irkutsk, 664033, Russian Federation 3 Irkutsk National Research Technical University, 83 Lermontova str., Irkutsk, 664074, Russian Federation 4 JSC Eurosibenergo, 22 Rabochaya str., Irkutsk, 664007, Russian Federation a https://orcid.org/0000-0003-3287-3298, karlinat@mail.com; b https://orcid.org/0000-0002-7437-2291, imz@mail.ru; c https://orcid.org/0000-0002-8561-5383, iwansys@mail.ru; d https://orcid.org/0000-0002-2330-1813, akolosov.irk@gmail.com; e https://orcid.org/0000-0002-8533-0214, mavikonst@mail.ru; f https://orcid.org/0000-0002-8719-7728, el.guseva@rambler.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2024 vol. 26 no. 1 pp. 194–211 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2024-26.1-194-211 ART I CLE I NFO Article history: Received: 12 December 2023 Revised: 10 January 2024 Accepted: 22 January 2024 Available online: 15 March 2024 Keywords: Modifi ers Grey cast iron Nanostructures Silicon dioxide Morphology Oxides Crystallization Plate Compacted Vermicular graphite ABSTRACT Introduction. During the metallurgical production of silicon, waste is generated that accumulates in dumps, harming the environment. Disposal and recycling of solid waste from silicon production is especially important because it contains important chemical compounds (silicon dioxide, silicon carbide, carbon nanotubes) that can be used in other industries, which will bring greater economic value. Considering the possibilities for extracting these useful components from silicon production waste, it is necessary to bring processing technologies to the stage of widespread practical application. Therefore, the development of a special waste processing technology to obtain a useful product in the form of a composition of silicon dioxide and silicon carbide remains an urgent problem. The purpose of the work is to study the formation of the morphological form of graphite when adding nano-modifi ers from silicon production waste. Methods. The work examined specimens of gray cast iron after modifi cation with a combined modifi er obtained from silicon production waste. The research methods are mechanical tests for statistical tension, analysis of the chemical composition and metallographic studies. Results and Discussion. It is revealed that the mechanical properties of gray cast iron increased by 30–50 % after modifi cation with a combined modifi er, compared with witness specimens. The morphology of graphite is an important parameter aff ecting the properties of cast iron. It is established that during the modifi cation process the morphology of graphite changes from lamellar to vermicular. Specimens of gray cast iron with vermicular form of graphite have high strength values compared to specimens of gray cast iron with lamellar form of graphite. The presented results confi rm the prospects of the developed approach aimed at obtaining new classes of modifi ers and products made of gray cast iron with a high complex of mechanical properties. For citation: Karlina A.I., Kondratiev V.V., Sysoev I.A., Kolosov A.D., Konstantinova M.V., Guseva E.A. Study of the eff ect of a combined modifi er from silicon production waste on the properties of gray cast iron. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2024, vol. 26, no. 1, pp. 194–211. DOI: 10.17212/1994-6309-2024-26.1-194-211. (In Russian). ______ * Corresponding author Karlina Antonina I., Ph.D. (Engineering), Research Associate National Research Moscow State Construction University, Yaroslavskoe shosse, 26, 129337, Moscow, Russia Tel: +7 950 120-19-50, e-mail: karlinat@mail.ru Introduction A large amount of waste is generated during the operation of steel plants around the world. Typically, this solid waste is partially recycled, but a signifi cant amount remains, causing damage to the environment. In all technological processes for the production of metallic silicon, material losses of varying degrees and quality occur. In Russia, at silicon production plants, a lot of unprocessed metallurgical slag remains in
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