Nizhny Novgorod State Technical University named after. R. E. Alekseev, Nizhny Novgorod, Russia

A. N. Grachev, Cand. Eng., Associate Prof., Dept. of Metallurgical Technologies and Equipment, e-mail: alexgra76@mail.ru
I. O. Leushin, Dr. Eng., Prof., Head of the Dept. of Metallurgical Technologies and Equipment, e-mail: igoleu@yandex.ru
V. A. Korovin, Dr. Eng., Associate Prof., Dept. of Metallurgical Technologies and Equipment, e-mail: v.korovin2015@yandex.ru
L. I. Leushina, Cand. Eng., Associate Prof., Dept. of Metallurgical Technologies and Equipment, e-mail: kafmto@mail.ru

Currently, the problem of waste disposal continues to be relevant. This is of interest both for the enterprises where they are formed, and for those who are looking for inexpensive and affordable materials for the implementation of foundry and metallurgical processes in their production conditions. The article provides information on the experience of developing technological solutions for the use of industrial waste in foundry and metallurgical technologies, as well as on the results achieved during their industrial testing in the conditions of existing production facilities. In particular, the use of: 1) slag formed during the remelting of secondary aluminum alloys (aluminum slag) as a filler of non-stick coatings of foundries and rods for steel and cast iron casting, as well as additives for producing steel in the main melting furnace; 2) sludge of quenching tanks (source of iron oxides, oxidizer), sludge of saltpeter baths (additive for accelerating ignition of the mixture) in compositions of exothermic mixtures for steel and cast iron casting; 3) sludge of salt quenching baths as slag-forming slag-forming slag and modifier for ladle treatment of gray and high-strength cast iron. The compositions of the considered waste are given, as well as their compliance with the federal classification catalog as of 2023. The data obtained in the course of research work expand the range of waste used in foundry and metallurgical technologies, lead to a decrease in the cost of casting while maintaining the required quality, and in some cases replace expensive foreign materials today.

1. Leushin I. O., Leushina L. I. Waste from thermal shops is a valuable material for precision casting. Tekhnologiya metallov. 2015. No. 4. pp. 25–28.
2. Leushin I. O., Subbotin A. Yu., Geyko M. A. Removing of zinc coating from steel base and application of by-products in foundry technologies. Chernye Metally. 2017. No. 10. pp. 48–53.
3. Leushina L. I., Leushin I. O., Plokhov S. V., Deev V. B. On the prospects for recycling broken quartz ceramic shells from lost-wax castings. Izvestiya vuzov. Chernaya metallurgiya. 2018. Vol. 61. No. 11. pp. 859–865.
4. Farisov R. D., Ioffe M. A., Leushin I. O. Remelting cast iron shavings with the synergistic effect of minimizing losses. Metallurg. 2021. No. 8. pp. 90–95.
5. Leushina L. I., Leushin I. O., Plokhov S. V. The use of spent wax-like model compositions as a part of a briquette for cupola melting of cast iron. Chernye Metally. 2020. No. 4. pp. 4–8.
6. Leushin I. O., Titov A. V., Rakitin S. R. Studies of the residual strength of liquid-glass rod mixtures with the addition of crushed waste siloxane rubber. Izvestiya Volgogradskogo gosudarstvennogo tekhnicheskogo universiteta. 2023. No. 7 (278). pp. 39–42.
7. Leushin I. O. et al. Method for manufacturing multi-layer shell casting molds according to investment patterns. Patent RF, No. 2746664. Applied: 16.09.2020. Published: 19.04.2021. Bulletin No. 11.
8. Geyko M. A. et al. Cold-hardening mixture for production of casting cores and molds. Patent RF, No. 2705823. Applied: 18.04.2019. Published: 12.11.2019. Bulletin No. 32.
9. Grachev A. N., Leushin I. O., Trefilov A. P. Selection of methods for determining waste properties for use in foundry technologies Certificate of registration of a computer program No. 2023615517. Published: 15.03.2023. Bulletin No. 3.
10. Grachev A. N., Leushin I. O., Trefilov A. P. Selection of methods for determining waste properties for use in foundry technologies Certificate of registration of a computer program No. 2023616593. Published: 29.03.2023.
11. Korovin V. A., Kurilina T. D., Stepanov P. P. Reduction of iron in the arc furnace and regulation of the thermal balance. Steel in Translation. 2014. Vol. 44, Iss. 12. pp. 897–900.
12. Grachev A. N., Leushin I. O. Non-stick coatings of casting molds and cores for steel and cast iron castings. Nizhny Novgorod, 2013. 186 p.
13. Grachev A. N., Leushin I. O., Leushina L. I. Development of compositions of exothermic mixtures for steel and iron castings using wastes of thermal production. Chernye Metally. 2018. No. 2. pp. 39–43.
14. Grachev A. N. et al. Exothermal mixture for heating lost heads of steel and cast iron castings Patent RF, No. 2601721. Published: 10.11.2016. Bulletin No. 31.
15. Leushin I. O., Grachev A. N., Maslov K. A., Leushina L. I. et al. Prerequisites for recycling sludge from salt baths produced by GAZ group enterprises in foundry technologies. Liteishchik Rossii. 2014. No. 3. pp. 28–30.
16. Leushin I. O. et al. Slag-forming mixture for cast iron making. Patent RF, No. 2576967. Published: 10.03.2016. Bulletin No. 7.
17. Romanov A. S., Korovin V. A., Leushin I. O. et al. Properties of cast iron after treating its melt with sludge from salt quenching tanks. Metallurgiya mashinostroeniya. 2016. No. 6. pp. 10, 11.
18. Korovin V. A. et al. Pseudo-master alloy. Patent RF, No. 2639186. Published: 20.12.2017. Bulletin No. 35.