Platov South Russian State Polytechnic University (Novocherkassk, Russia):
E. A. Yatsenko, Dr. Eng., Prof., Head of “General Chemistry and Technology of Silicates” Dept., e-mail: e_yatsenko@mail.ru
B. M. Goltsman, Cand. Eng., Associate Prof., “General Chemistry and Technology of Silicates” Dept., e-mail: boriuspost@gmail.com
A. A. Tretyak, Dr. Eng., Prof., Dean of the Faculty of Geology, Mining and Oil-Gas Matter, e-mail: Alexandr_bngs@mail.ru
A. A. Chumakov, Post-Graduate, “General Chemistry and Technology of Silicates” Dept., e-mail: a-chumakov@mail.ru

The slags formed during the smelting of ferrous alloys consist of more than 75% oxides of calcium, iron and silicon that predetermines broad prospects for their use as an alternative to natural raw materials. Considering the significant amount of alkaline earth oxides (calcium and magnesium) in the metallurgical slag, it seems promising to use it as a fluxing additive in highalumina aluminosilicate materials, one of which is proppants – granular aluminosilicate materials designed to enhance oil production by hydraulic fracturing. The aim of this work is to study the effect of metallurgical slag additives on the processes of proppant synthesis based on drill slurry. The composition of the initial drill slurry from the Morozovskoye deposit and the fluxing additive of metallurgical slag of JCS “TagMet” was studied. Based on the composition of the metallurgical slag, an assumption was made about its fluxing activity in the synthesis of silicate materials, which is due to a large amount of alkaline earth metal oxides, a low intensity of the crystalline phase and the presence of preliminary heat treatment. Five compositions of raw mixtures for the production of proppants were developed with the addition of two types of fluxing additives: metallurgical slag and sodium hydroxide. Qualitative (texture and color) and quantitative (density and sintering coefficient) parameters of the degree of sintering and melting of mixtures were determined. It was shown that both additives have a fluxing effect on drill slurry. It was found that the introduction of metallurgical slag leads to a change in texture to a more sintered one, as well as an increase in density and sintering coefficient. The introduction of sodium hydroxide has a more active effect on drill slurry, which leads to glass formation of the surface and further melting of the material. Physicochemical processes under the fluxing effect of the selected additives were considered, which is explained by the formation of more low-melting silicates, which reduce the final melting temperature of the mixture.

The work was performed at YuRGPU (NPI) with the financial support of the Russian Science Foundation under the Agreement No. 20-79-10142 “Development of an effective technology for synthesis of aluminosilicate proppants using waste of drilling oil and gas wells of the Southern Federal District” (head – A. A. Tretyak).

1. Sheshukov О. Yu., Mikheenkov М. А., Nekrasov I. V., Egizaryan D. К., Metelkin А. А., Shevchenko О. I. Issues of utilization of refining slags of steelmaking production: A monograph. Ural Federal University named after the first President of Russia B. N. Eltsin, Nizhny Tagil Institute of Technology (branch), 2017. 208 p.
2. Grigoryan V. А., Belyanchikov L. N., Stomakhin А. Ya. Theoretical bases of electric steelmaking processes. Moscow: Metallurgiya, 1987. 272 p.
3. Rashad A. M. A synopsis manual about recycling steel slag as a cementitious material. Journal of Materials Research and Technology. 2019. Vol. 8, Iss. 5. pp. 4940–4955.
4. Dong Q., Wang G., Chen X. et al. Recycling of steel slag aggregate in portland cement concrete: An overview. Journal of Cleaner Production. 2021. Vol. 282. p. 124447.
5. Chen X., Wang G., Dong Q. et al. Microscopic characterizations of pervious concrete using recycled Steel Slag Aggregate. Journal of Cleaner Production. 2020. Vol. 254. p. 120149.
6. Volokitina А. V., Volkov I. N. Complex application of blast furnace slag in structural layers of pavement. Vysokie tekhnologii v stroitelnov komplekse. 2020. No. 1. pp. 56–59.
7. Pimenov А. Т., Pribylov V. S. Application of slag aggregates as a part of asphalt concrete for increasing durability of road coverings. Vestnik Sibirskogo gosudarstvennogo avtomobilnodorozhnogo universiteta. 2019. Vol. 16. No. 6 (70). pp. 766–779.
8. Goltsman B. М. Combination of slags in production of thermal insulation materials. Nauchnoe obozrenie. 2014. No. 6. pp. 75–78.
9. Yatsenko E., Tretyak A., Chumakov A., Golovko D. Prospects for the use of drilling slurries for the synthesis of aluminosilicate propants. Materials Today: Proceedings. 2021. Vol. 38. Part 4. pp. 1886–1888.
10. Spínola D. C. S., De Miranda A., Macedo D. A. et al. Preparation of glass-ceramic materials using kaolin and oil well drilling wastes. Journal of Materials Research and Technology. 2019. Vol. 8, Iss. 4. pp. 3459–3465.
11. Cheng X., Long D., Zhang C. et al. Utilization of red mud, slag and waste drilling fluid for the synthesis of slag-red mud cementitious material. Journal of Cleaner Production. 2019. Vol. 238. pp. 117902.
12. Mironov N. А., Usmanov I. R. Use of drilling mud in road construction. Cloud of Science. 2013. No. 2. pp. 33–36.
13. Shagigalin G. Yu., Gataullin А. V., Khababutdinova N. B., Lomakina L. N. Assessment of possibility of application in construction of drilling mud of the Republic of Bashkortostan. Stroitelnye materialy. 2016. No. 11. pp. 57–58.
14. Zubekhin А. P., Golovanova S. P., Yatsenko Е. А. et. al. Fundamentals of technology of refractory non-metallic and silicate materials. Moscow: Izdatelstvo KARTEK, 2010. 308 p.