Mirny Polytechnic Institute–Division of the Ammosov North-Eastern Federal University, Mirny, Russia¹ ; Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources—IPKON, Russian Academy of Sciences, Moscow, Russia²

G. P. Dvoichenkova^1,2, Chief Researcher, Professor, Doctor of Engineering Sciences, dvoigp@mail.ru

Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources—IPKON, Russian Academy of Sciences, Moscow, Russia
V. A. Chanturia, Chief Researcher, Academician of the Russian Academy of Sciences
A. S. Timofeev, Senior Researcher, Candidate of Engineering Sciences

Coraline Engineering, Moscow, Russia
E. N. Chernysheva, Production Engineer, Candidate of Engineering Sciences

The article presents the comparative experimental studies and industrial testing data on the methods of increasing the corrosion resistance of ferrosilicon in order to reduce its losses in dense medium separation of refractory diamond-bearing materials. The integrated analytical and laboratory studies show that the maximum corrosion resistance of components of the ferrosilicon suspension is achieved using the electrochemical, physical and physicochemical methods used for modifying the surface properties of ferrosilicon granules and the parameters of the aqueous phase of the technological process. The results of bench tests show that the use of electrochemically treated water in the dense medium separation process reduces ferrosilicon losses in the ferrosilicon suspension regeneration cycle at its consumption decreased by 1.9 times. The pilot tests of a dense medium separation scheme demonstrate that replacing oxygencontaining air by inert gas nitrogen in the cycle of preparation and mixing during storage of a ferrosilicon suspension increases the service life of ferrosilicon by 1.5 times while reducing the process losses by 2.5 times. The results of the laboratory, bench and pilot tests prove that nitriding of ferrosilicon to create a nitride shell 30–60 nm thick on ferrosilicon surface ensures stability of ferrosilicon granules when they interact with corrosive elements of circulating water in the dense medium separation process, with an increase in the service life of ferrosilicon by 2.2 times and at the loss reduction by 2.7 times. The technological effectiveness of the developed methods for increasing the corrosion resistance of ferrosilicon is confirmed on an industrial scale of dense medium separation at diamond recovery plants of ALROSA.

1. Napier-Munn T. The dense medium cyclone—Past, present and future. Minerals Engineering. 2018. Vol. 116. pp. 107–113.
2. Leontiev R. G., Arkhipova Yu. A. Development of the mining complex of the Russian Far East. IOP Conference Series: Earth and Environmental Science. 2021. Vol. 723, Iss. 5. ID 052014.
3. Verkhoturov M. V., Amelin S. A., Konnova N. I. Diamond beneficiation. Mezhdunarodnyi zhurnal eksperimentalnogo obrazovaniya. 2012. No. 2. p. 61.
4. Makhrachev A. F., Larionov N. P., S avitskiy V. B. New directions in the technology of concentration of diamond-bearing raw materials at the enterprises of Alrosa company. Gornyi Zhurnal. 2005. No. 7. pp. 99–101.
5. Klyuev R. V., Bosikov I. I., Mayer A. V., Gavrina O. A. Comprehensive analysis of the effective technologies application to increase sustainable development of the naturaltechnical sy stem. Ustoychivoe razvitie gornykh territoriy. 2020. Vol. 12, No. 2(44). pp. 283–290.
6. Martynov N. V., Dobromirov V. N., Avramov D. V. Electro-hydraulic disintegration technology for diamond-bearing rocks. Obogashchenie Rud. 2020. No. 1. pp. 8–14.
7. Chanturia V. A., Dvoichenkova G. P. Innovation separation of natural and manmade diamond-bearing materials. Modern Problems of Integrated and Deep Processing of Natural and Manmade Minerals : International Conference Proceedings (Plaksin’s Lectures–2022). Vladivostok : DVFU, 2022. pp. 16–29.
8. Liu R., Cui Y., Liu L., Wang F. Study on the mechanism of hydrostatic pressure promoting electrochemical corrosion of pure iron in 3.5% NaCl solution. Acta Materialia. 2021. Vol. 203. ID 116467.
9. Williams R. A., Kelsall G. H. Degradation of ferrosilicon media in dense medium separation circuits. Minerals Engineering. 1992. Vol. 5, Iss. 5. pp. 57–77.
10. Bogdanovich А. V., Vasilyev А. М., Urnysheva S. А. Effect of diamondbearing ores preparation on the technology of their beneficiation. Obogashchenie Rud. 2017. No. 2. pp. 10–15.
11. Kaliti n V. T., Monastyrskiy V. F. Processes in treatment and beneficiation of diamondbearing raw materials. Obogashchenie Rud. 2001. No. 6. pp. 58–62.
12. Timofeev A. S., Ananev P. P., Dvoychen kov a G. P. A mathematical model of oxidation of granules of ferrosilicium in the mineralized waters. GIAB. 2017. No. 5. Special issue 8. 12 p.

13. Chanturia V. A., Kozlov A. P., Shadrunova I. V., Ozhogina E. G. Top-priority areas for the advance of pilot studies and applied research into commercial-scale utilization of mineral mining and processing wastes. Gornaya promyshlennost. 2014. No. 1. pp. 54–57.
14 . Chanturia V. A., Bondar S. S., Godun K. V., Goryachev B. E. Diamond industry in Russia and in the world’s top diamond producing countries: State-of-the-art. Gornyi Zhurnal. 2015. No. 2. pp. 55–58.
15. Dvoichenkova G. P., Timofeev A. S., Chernysheva E. N., Kovalchuk O. E. Experimental validation of electrochemical and physicochemical approaches to stabilization of ferrosilicon suspension parameters. GIAB. 2015. No. 9. pp. 41–48.
16. Tedesco S. A. Processing procedures to extract helium, nitrogen, and carbon dioxide. Geology and Production of Helium and Associated Gases. Amsterdam : Elsevier, 2022. pp. 321–346.
17. Manasheva E. M., Manashev I. R., Zathdinov M. Kh., Makarova I. V. Development and application of SHS ferrosilicon nitride to increase the resistance of taphole clays for blast furnaces. Refractories and Industrial Ceramics. 2022. Vol. 62, No. 6. pp. 692–698.
18. Runci A., Provis J. L., Serdar M. Revealing corrosion parameters of steel in alkaliactivated materials. Corrosion Science. 2023. Vol. 210. ID 110849.
19. Bolgaru K. A., Akulinkin A. A., Kryukova O. G. Effect of mechanical pre-activation on the nitriding of aluminum ferrosilicon in the combustion mode. Journal of Physics: Conference Series. 2020. Vol. 14 59. ID 012009.
20. Dvoichenkova G. P., Timofeev A. S., Podkamenny Yu. A. Pilot test data on corrosion resistance of nitrided ferrosilicium in long-term contact with mineralized water. GIAB. 2023. No. 9. pp. 114–129.