Revealing new patterns in resource­saving processing of chromium­containing ore raw materials by solid­phase reduction

Authors

  • Viacheslav Borysov Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313, Ukraine http://orcid.org/0000-0002-3117-2118
  • Ihor Hevko Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313, Ukraine http://orcid.org/0000-0003-1325-1434
  • Oleksii Torubara Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313, Ukraine http://orcid.org/0000-0001-7174-4611
  • Svitlana Borysova Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313, Ukraine http://orcid.org/0000-0003-0610-644X
  • Dmitry Milko Dmytro Motornyi Tavria State Agrotechnological University B. Khmelnytskoho ave., 18, Melitopol, Ukraine, 72312, Ukraine http://orcid.org/0000-0002-0991-1930
  • Dmytro Zhuravel Dmytro Motornyi Tavria State Agrotechnological University B. Khmelnytskoho ave., 18, Melitopol, Ukraine, 72312, Ukraine http://orcid.org/0000-0002-6100-895X
  • Bohdan Tsymbal National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023, Ukraine http://orcid.org/0000-0002-2317-3428
  • Viacheslav Bratishko National University of Life and Environmental Sciences of Ukraine Heroiv Oborony str., 15, Kyiv, Ukraine, 03041, Ukraine http://orcid.org/0000-0001-8003-5016
  • Kyrylo Samoichuk Dmytro Motornyi Tavria State Agrotechnological University B. Khmelnytskoho ave., 18, Melitopol, Ukraine, 72312, Ukraine http://orcid.org/0000-0002-3423-3510
  • Yulia Postol Dmytro Motornyi Tavria State Agrotechnological University B. Khmelnytskoho ave., 18, Melitopol, Ukraine, 72312, Ukraine http://orcid.org/0000-0002-0749-3771

DOI:

https://doi.org/10.15587/1729-4061.2020.196653

Keywords:

chromium-containing oxide ore raw materials, phase analysis, carbon thermal treatment, carbide, doping, reduction

Abstract

The physical and chemical properties of products from the carbon-thermal reduction of oxide chromo-containing ore raw materials have been investigated. This is necessary to determine the parameters that reduce the loss of Cr in the processing of ore materials and the use of metallized chromium doping additives in steelmaking. It has been determined that the increase in processing temperature from 1,250 K to 1,450 K led to an increase in the manifestation of Cr23C6 and (Cr, Fe)7C3. In this case, the diffraction maxima of Cr2O3 corresponded to the trend of weakening and, having been treated at 1,450 K, had a residual character. Cr3C2 on the diffractograms was only evident after processing at 1,250 K. The phase of the metallic Cr was traced in the samples after processing at 1,350 K and 1,450 K with the increased intensity of manifestation when the heating temperature rose. It has been determined that the microstructure of reduction products is heterogeneous with the presence of particles of different sizes and chemical compositions. The increase in the reduction temperature from 1,250 K to 1,350 K and 1,450 K and the development of reduction processes were accompanied by particle sintering with the formation of a spongy microstructure. We have detected regions that characterized inclusions and the phases where Cr content amounted to 65.10 % by weight, Fe ‒ to 16.13 % by weight. Some local areas with particles with a relatively high content of ore impurities and carbon have also been found. It follows from the results of our study that the most acceptable temperature for reduction is 1,450 K. In this case, the reduction is ensured with a predominance in the phase composition of the metal Cr and carbides (Cr, Fe)7C3 and Cr23C6 relative to the oxide component of Cr2O3. In this case, the lower residual carbon content was due to the higher efficiency of the reducer compared to other temperature regimes.

The spongy microstructure allows for a faster dissolution compared to standard ferroalloys, thereby reducing the duration of smelting

Author Biographies

Viacheslav Borysov, Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313

Head of Laboratory

Research Laboratory of Applied Materials Science

Ihor Hevko, Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313

Senior Researcher

Research Laboratory of Applied Materials Science

Oleksii Torubara, Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313

Senior Researcher

Research Laboratory of Applied Materials Science

Svitlana Borysova, Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313

Senior Researcher

Research Laboratory of Applied Materials Science

Dmitry Milko, Dmytro Motornyi Tavria State Agrotechnological University B. Khmelnytskoho ave., 18, Melitopol, Ukraine, 72312

Doctor of Technical Sciences, Professor

Department of Technical Systems of Livestock Technologies

Dmytro Zhuravel, Dmytro Motornyi Tavria State Agrotechnological University B. Khmelnytskoho ave., 18, Melitopol, Ukraine, 72312

Doctor of Technical Sciences, Associate Professor

Department of Technical Service and Systems in the Agro-Industrial Complex

Bohdan Tsymbal, National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023

PhD

Department of Occupational, Technogenic and Environmental Safety

Viacheslav Bratishko, National University of Life and Environmental Sciences of Ukraine Heroiv Oborony str., 15, Kyiv, Ukraine, 03041

Doctor of Technical Sciences, Senior Researcher, Associate Professor

Department of Livestock Mechanization

Kyrylo Samoichuk, Dmytro Motornyi Tavria State Agrotechnological University B. Khmelnytskoho ave., 18, Melitopol, Ukraine, 72312

Doctor of Technical Sciences, Аssociate Professor, Head of Department

Department of Processing and Food Production Equipment named after professor F. Yalpachik

Yulia Postol, Dmytro Motornyi Tavria State Agrotechnological University B. Khmelnytskoho ave., 18, Melitopol, Ukraine, 72312

PhD, Аssociate Professor, Head of Department

Department of Electrical Technology and Thermal Processes

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Published

2020-02-29

How to Cite

Borysov, V., Hevko, I., Torubara, O., Borysova, S., Milko, D., Zhuravel, D., Tsymbal, B., Bratishko, V., Samoichuk, K., & Postol, Y. (2020). Revealing new patterns in resource­saving processing of chromium­containing ore raw materials by solid­phase reduction. Eastern-European Journal of Enterprise Technologies, 1(12 (103), 24–29. https://doi.org/10.15587/1729-4061.2020.196653

Issue

Section

Materials Science