Research into recycling of nickel­cobalt­containing metallurgical wastes by the ecologically­safe technique of hydrogen reduction

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.114348

Keywords:

scale, precision alloy, hydrogen reduction, phase analysis, microstructure, resource saving, alloying

Abstract

We studied kinetic patterns of hydrogen reduction of the scale of a nickel-cobalt containing precision alloy at a temperature of 673‒1573 K over a period from 0 to 180 minutes. The highest degree of reduction was achieved after thermal treatment at 1273 K – 99 %. This is predetermined by the intensification of reduction processes and a sufficient level of porosity, which ensures satisfactory gas exchange. It was discovered that the starting scale consists mainly of Fe3O4, Fe2O3 and FeO with atoms substituting their alloying elements. The target product of metallization had a sponge-like microstructure and consisted mainly of the solid solution of Co and Ni atoms in γ-Fe and the residual non-reduced Fe3O4 and FeO. The resulting phases had no noticeable susceptibility to sublimation.

This has ensured a reduction in the losses of alloying elements while receiving and using the highly-alloyed metallized scale, which was confirmed by experimental- industrial tests. At the same time, recycling of industrial wastes contributes to a reduction in the technogenic intensity of industrial regions and improves ecological safety of the environment

Author Biographies

Stanislav Hryhoriev, Zaporizhzhia National University Zhukovskoho str., 66, Zaporizhzhia, Ukraine, 69600

Doctor of Technical Sciences, Professor

Department of business administration and international management

Artem Petryshchev, Zaporizhzhia National Technical University Zhukovskoho str., 64, Zaporizhzhia, Ukraine, 69063

PhD, Associate Professor

Department of Labour and Environment Protection

Ganna Shyshkanova, Zaporizhzhia National Technical University Zhukovskoho str., 64, Zaporizhzhia, Ukraine, 69063

PhD, Associate Professor

Department of Applied Mathematics 

Tetyana Zaytseva, Oles Honchar Dnipro National University Gagarina ave., 72, Dnipro, Ukraine, 49010

PhD, Associate Professor

Department of Computer Technologies 

Oleksandr Frydman, Oles Honchar Dnipro National University Gagarina ave., 72, Dnipro, Ukraine, 49010

PhD, Associate Professor

Department of Statistics and Probability Theory 

Olga Sergienko, Zaporizhzhia National Technical University Zhukovskoho str., 64, Zaporizhzhia, Ukraine, 69063

PhD

Department of Foundry Technology and Equipment 

Andrii Ivanchenko, Zaporizhzhia National Technical University Zhukovskoho str., 64, Zaporizhzhia, Ukraine, 69063

PhD

Department of personnel management and labor Economics

Elena Usenko, Chernihiv National University of Technology Shevchenka str., 95, Chernihiv, Ukraine, 14027

PhD

Department of Civil, Economic, Administrative Law and Process

Olga Berezhnaya, Zaporizhzhia State Engineering Academy Soborny ave., 226, Zaporizhzhia, Ukraine, 69006

PhD, Associate Professor

Department of metallurgy

Andrii Semenchuk, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD

Department of mathematical methods in engineering

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Published

2017-11-08

How to Cite

Hryhoriev, S., Petryshchev, A., Shyshkanova, G., Zaytseva, T., Frydman, O., Sergienko, O., Ivanchenko, A., Usenko, E., Berezhnaya, O., & Semenchuk, A. (2017). Research into recycling of nickel­cobalt­containing metallurgical wastes by the ecologically­safe technique of hydrogen reduction. Eastern-European Journal of Enterprise Technologies, 6(10 (90), 45–50. https://doi.org/10.15587/1729-4061.2017.114348