Ash and Slag Waste Processing in Self-Shielded Atmospheric DC Arc Discharge Plasma

Zhanar Bolatova; Alexander Pak; Kirill Larionov; Dmitriy Nikitin; Pavel Povalyaev; Aleksander Ivashutenko; Gennady Mamontov; Alexey Pestryakov

doi:10.3390/ma15228134

Ash and Slag Waste Processing in Self-Shielded Atmospheric DC Arc Discharge Plasma

Materials (Basel). 2022 Nov 16;15(22):8134. doi: 10.3390/ma15228134.

Authors

Zhanar Bolatova¹, Alexander Pak¹, Kirill Larionov¹, Dmitriy Nikitin¹, Pavel Povalyaev¹, Aleksander Ivashutenko¹, Gennady Mamontov¹, Alexey Pestryakov^{1

2}

Affiliations

¹ School of Energy & Power Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia.
² Research Lab of Catalytic and Biomedical Technologies, Sevastopol State University, 299053 Sevastopol, Russia.

Abstract

In this paper, we report the experimental results obtained in slag waste processing by direct current arc discharge initiated in ambient air. The method does not employ vacuum and gas equipment, therefore increasing the energy efficiency of processing. Plasma processing of coal slag was performed at different arc exposure times: 5, 10, 15, 20, and 25 s. The obtained materials contained a significant amount of graphite, which was removed through combustion. The micropowder based on silicon carbide and aluminum nitride was obtained and then sintered by spark plasma. The bulk ceramic samples based on silicon carbide with the hardness of ~10.4 GPa were finally fabricated.

Keywords: aluminum nitride; coal slag; electric arc method; silicon carbide; slag waste.

Grants and funding

The work was carried out within the framework of the State Assignment for Universities (projects FSWW-2022-0018), Sevastopol State University research grant no. 42-01-09/169/2021-4.