Kola MMC, Monchegorsk, Russia:

M. I. Ryabushkin, First Deputy General Director – Chief Engineer, e-mail: RyabushkinMI1@kolagmk.ru

Gipronikel Institute LLC, Saint Petersburg, Russia:
R. A. Pakhomov, Senior Researcher at the Pyrometallurgy Laboratory, Candidate of Technical Sciences, e-mail: PakhomovRA@nornik.ru
L. B. Tsymbulov, Director of the Research and Development Department, Doctor of Technical Sciences
Yu. A. Savinova, Senior Researcher at the Pyrometallurgy Laboratory, Candidate of Technical Sciences

Kola MMC has built a new nickel site that relies on chlorine leaching of nickel powder followed by electrowinning of nickel with insoluble anodes. After the new site had been commissioned, the operations of the refining facility saw changes, the electric anode furnaces were taken out of service, and a magnetic separation section was commissioned. The latter helps remove unreacted coal, metal oxides and other non-magnetic components from the tube kiln nickel powder thus ensuring its optimized quality. At the same time, once the electric furnaces had been removed from the process, it created the need for strict control over carbon and slag-forming constituent concentration in the nickel powder that goes to the chlorine leaching section. This paper looks at the history of the process behind the production of roasted nickel – the product of fluidized-bed furnaces – and describes the revamping stages witnessed by the Kola MMC site. The paper also analyzes certain features related to the current processing of nickel concentrates – from nickel matte separation to the production of nickel metal powder. The latter is further sent for chlorine leaching and in the presence of chlorine gas it gets dissolved. Then copper, iron, zinc and cobalt are removed from the resultant liquor and the purified sulphate-chloride solution goes in the electrolysis cells where high-purity nickel cathodes are produced. The authors analyzed the compositions of the key components in the studied materials of the nickel processing line. Special attention is given to the behaviour of silicon dioxide as one of the impurities causing most problems in the new process.

1. Geld P. V., Esin O. A. High-temperature reduction processes. Sverdlovsk : Metallurgizdat, 1957. 646 p.
2. Xi Z., Wang Z., Li X., Guo H. Improving the Desulfurization Degree of High-Grade Nickel Matte via a Two-Step Oxidation Roasting Process. Metallurgical and Materials Transactions B. 2018. Vol. 49. pp. 1834–1840.
3. Klyushnikov A. M., Gulyaeva R. I., Selivanov E. N., Pikalov S. M. Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings. International Journal of Minerals, Metallurgy and Materials. 2021. Vol. 28. pp. 1469–1477.
4. Izerbakh Yu. F., Sidak N. A. Production of high-activity gas nickel powder. Norilsk, 1965. pp. 34–43.
5. Sukhov M. N., Bryndin V. G., Svechnikov G. S. Developing processes and devices for fluidized bed reduction of nickel protoxide. Norilsk, 1963.
6. Alekseev Yu. V. Talking one more time about the factors that impact the quality of nickel powder. Tsvetnye Metally. 1962. No. 12. pp. 59, 60.
7. Syromyatnikov N. I., Volkov V. F. Fluidized bed processes. Sverdlovsk : Metallurgizdat, 1959. 248 p.
8. Tatosyan E. K., Bryukvin V. A., Vinetskaya T. N., Blokhina L.I., Melnik Yu. I. Analyzing the activity of nickel powders produced in fluidized bed furnaces. Tsvetnye Metally. 1993. No. 5. pp. 16–18.
9. Baykov A. A. Research papers. Vol. 2: Papers in metallography (metals science), the theory of metallurgical processes and general and physical chemistry. Moscow : Izdatelstvo AN SSSR, 1948. 592 p.
10. Rostovtsev S. T. Theory of metallurgical processes. Moscow : Metallurgizdat, 1956. 515 p.
11. Chufarov G. I., Tatievskaya E. P. Adsorption- and kinetics-based theory behind metal oxide reduction. Moscow : Izdatelstvo AN SSSR, 1953. pp. 21–23.
12. Chufarov G. I., Zhuravleva M. G., Balakirev V. F. Status of the metals reduction theory. Moscow : Nauka, 1970. pp. 7–15.
13. Chufarov G. I., Zhuravleva M. G. Catalytic phenomena associated with the reduction of metal oxides and chemical compounds. Moscow : Metallurgizdat, 1964. pp. 21–32.
14. Leontiev L. I. On the mechanism and kinetics behind the reduction of calcium ferrites: Extended abstract of Candidate of Technical Sciences dissertation. Sverdlovsk, 1964. 15 p.
15. Elyutin V. P., Pavlov Yu. A., Polyakov V. P. Interaction between metal oxides and carbon. Moscow : Metallurgiya, 1976. 359 p.
16. Balandin A. A. The issues of chemical kinetics, catalysis and reactivity. Moscow : Izdatelstvo AN SSSR, 1955. 884 p.
17. Brusakov Yu. I., Varyushenkov A. M., Isaeva E. P. The type of carbonaceous reducing agent and how it changes the physico-chemical properties of burden used for the production of aluminium-silicon alloys. Trudy VAMI. 1971. p. 52.
18. Varyushenkov A. M., Arakelyan O. I., Isaeva E. P. Carbon reduction of silica in application to the production of crystalline silicon. Trudy VAMI. 1972. p. 118.
19. Varyushenkov A. M., Kiselev A. M., Isaeva E. P. Understanding the reducing ability of carbonaceous materials. Trudy VAMI. 1973. p. 106.
20. Kozlov V. M., Guseva N. S. Effect of carbonaceous materials on the gasification of silicon dioxide. Trudy VAMI. 1986. p. 77.
21. Seregin P. S. Feeding fuel oil in the Severonikel tube kilns as a reducing agent: Pilot testing. Saint Petersburg : Institut Gipronikel, 2009. 9 p.
22. Seregin P. S. Pilot testing of poorly caking coal from the Kuznetsk Coal Basin as a reducing agent in the Severonikel tube kilns. Saint Petersburg : Institut Gipronikel, 2009. 23 p.
23. Seregin P. S. Pilot testing of low-ash coal from the Bachatsky Mine (property of Kuzbassrazrezugol OJSC) in the Severonikel tube kilns. Saint Petersburg : Institut Gipronikel, 2009. 20 p.
24. Seregin P. S. Pilot testing of anthracite (Gukovugol OJSC) as a reducing agent in the Severonikel tube kilns. Saint Petersburg : Institut Gipronikel, 2009. 15 p.
25. Seregin P. S. Pilot testing of tube kiln regimes to obtain an active fraction of nickel powder at Severonikel. Saint Petersburg : Institut Gipronikel, 2009. 13 p.
26. K. A. Demidov, S. G. Besedovskiy, V. F. Kozyrev, L. Sh. Tsemekhman et al. Method of producing an active nickel powder. Patent RF, No. 2359049. Applied: 18.06.2007. Published: 20.06.2009. Bulletin No. 17.

27. Tsapah S. L., Demidov K. A., Khomchenko O. A., Sadovskaya G. I. Mechanism of processing of copper-nickel matte concerning chlorine based on technology of electrolytic nickel production. Tsvetnye Metally. 2009. No. 9. pp. 72–75.
28. Khomchenko O. A., Sadovskaya G. I., Dubrovskiy V. L., Smirnov P. V., Tsapakh S. L. Development and implementation of chlorine technology of nickel and cobalt at JSC “Kola MMC”. Tsvetnye Metally. 2014. No. 9. pp. 81–88.
29. K. A. Demidov, S. G. Besedovskiy, N. A. Shelestov, O. A. Khomchenko, G. I. Sadovskaya, S. I. Zhilichkin. Method of production of electrolytic nickel. Patent RF, No. 2303086. Applied: 20.02.2007. Published: 20.07.2007. Bulletin No. 20.
30. G. P. Miroevskiy, A. N. Golov, I. G. Ermakov, V. F. Kozyrev, V. A. Odintsov et al. Method of electrolytic refining of nickel. Patent RF, No. 2144098. Applied: 27.05.1999. Published: 10.01.2000.
31. Tsapakh S. L., Lutova L. S., Chetverkin A. Yu. To a problem of copper deposition in presence of elemental sulfur and a reducing agent. Tsvetnye Metally. 2012. No. 4. pp. 26–31.
32. Jeangros Q., Hansen T. W., Wagner J. B., Damsgaard C. D., Dunin-Borkowski R. E. et al. Reduction of nickel oxide particles by hydrogen studied in an environmental TEM. Energy Materials & Thermoelectrics, Mater Science. 2013. No. 48. pp. 2893–2907.
33. Manukyan K. V., Avetisyan A. G., Shuck C. E., Chatilyan H. A., Rouvimov S. et al. Nickel oxide reduction by hydrogen: kinetics and structural transformations. The Journal of Physical Chemistry C. 2015. Vol. 28. pp. 16131– 16138.
34. Dong Soo Lee, Dong Joon Min. A Kinetics of hydrogen reduction of nickel oxide at moderate temperature. Metals and Materials International. 2019. Vol. 25. pp. 982–990.
35. Quiroz Cabascango V. E., Bazhin V. Yu. Nickel oxide reduction in CO/CO₂ gas mixtures in reverberatory furnaces. Journal of Physics: Conference Series. 2020. Vol. 1515. 022028.
36. Mamyan S., Chatilyan H. A., Kharatyan S. L. Kinetic features of nickel oxide reduction by methane at non isothermal conditions. XV International Symposium on Self-Propagating High-Temperature Synthesis. Moscow. 2019. pp. 254–256.
37. Yan-ling Zhang, Wen-Ming Guo, Yang Liu, Xin-lei Jia. Reduction mechanism of Fe₂O₃ – Cr₂O₃ – NiO system by carbon. Journal of Central South University. 2016. Vol. 23. pp. 1318–1325.
38. Krishtal M. M., Yasnikov I. S., Polunin V. I., Filatov A. M., Ulianinkov A. G. Scanning electron microscopy and X-ray microanalysis: Examples of practical application. Moscow : Tekhnosfera, 2009. 206 p.
39. Savinova Yu. A., Rumyantsev D. V., Mishina O. Yu., Bannikova S. A., Somov P. A. Analyzing the material composition and morphology of finely dispersed metallurgical dusts by means of scanning electron/ion microscopy and X-ray microanalysis. Proceedings of the 28^th Russian Electron Microscopy Conference. Chernogolovka. 2020. 5–10 September. pp. 110–111.
40. Savinova Yu. A. Developing a process for processing sulphide ore concentrates of non-ferrous metals that would involve oxidizing roasting in fluidized-bed furnaces: Candidate of Technical Sciences dissertation: 05.16.02. Saint Petersburg, 2018. 155 p.