Development of Soderberg Carbon Electrodes Bonded with a Carbon Nanofbre Reinforced Coal-Tar Pitch

M. Miranda-Martínez, J. R. Campello-García, D. Castaño-Laviana

Faculty of Materials Science and Ceramics, ITMA Materials Technology, 33428 Llanera, Asturias/Spain

Revision 29.05.2018, 26.09.2018

Volume 11, Issue 1, Pages 63 - 67

Abstract

The operation of Electric Arc Furnaces (EAF) relies on the use of different types of carbon electrodes. Most of them are subjected to thermal treatments before use. However, Soderberg electrodes are formed in situ. Their carbon paste is fully transformed under operation. Soder berg paste is composed of calcined anthracite and petroleum coke, pitch being used as binder. This work evaluates the incorporation of Carbon Nanofbres (CNF) to coal-tar pitch for Soderberg paste production. The effects of this nano-addition have been studied both on the coal tar pitch alone and on the Soderberg paste mix. To carry out the study a reference formulation, composed of coal tar pitch, calcined anthracite and petroleum coke, was designed, processed and characterised.

Keywords

Soderberg electrodes, coal-tar pitch, carbon nanofbres

References

[1] European Commission: Integrated pollution prevention and control (IPPC). Reference document on best available techniques in the non ferrous metals industries, 2001 [2] Guerra, E.; Berciano, J.: Monografías sobre Tecnología del Acero. Parte I Acería Eléctrica, 2009 [3] Salgado, P.: Mathematical and numerical analysis of some electromagnetic problems, application to the simulation of metallurgical electrodes. PhD Thesis, Santiago de Compostela 2002 [4] Karuppannan C, Prabhakar R.: Analysing of Soderberg cell technology performance and possibilities. Manufacturing Engin. 2009 [2] 5–9 [5] Larsen, B.: Electrode models for Soderberg paste. 5 Int. Platinum Conf. 2012, Sun City, South Africa, 17–21 September 2012 [6] Invaer, R.: A status for the Soderberg smelting electrodes. Electrotech 92, Montreal 1992 [7] Lawrence, J.G.; Berhan, L.M.; Nadarajah. A.: Elastic properties and morphology of individual carbon nanofbers. ACS Nano 2 (2008) [6] 1230–1236 [8] Ozkan, T.; Naraghi, M.; Chasiotis, I.: Mechanical properties of vapor grown carbon nanofibers. Carbon 48 (2010) [1] 239–244 [9] Jacobsen, R.L.; et al.: Mechanical properties of vapor-grown carbon fber. Carbon 33 (1995) [9] 1217–122 [10] White, J.L.: The formation of microstructure in graphitizable materials. Progress in Solid State Chemistry 9 (1975) [9] 59–104 [11] Buseck, P.R.; Beyssac, O.: From organic matter to graphite: Graphitization. Elements 10 (2014) [6] 421–426 [12] Lewis, I.C.: Chemistry of carbonisation. Carbon 20 (1982) [6] 519–529 [13] Jones, S.; Bart, E.F.: Binders for the ideal carbon. In: Essential readings in light metals. Vol. 4: Electrode technology for aluminum production. Hoboken, NJ 2013, 198–214

Copyright

Göller Verlag GmbH