University of Oulu

Henri Pauna et al 2021 Plasma Res. Express 3 025008.

Cyanide recombination in electric arc furnace plasma

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Author: Pauna, Henri1; Willms, Thomas2; Aula, Matti1;
Organizations: 1Process Metallurgy Research Unit, P.O. Box 4300, FI-90014, University of Oulu, Finland
2RWTHAachen University, Department of Industrial Furnaces and Heat Engineering, Kopernikusstrasse 10, 52074 Aachen, Germany
3Nano and Molecular Systems Research Unit, P.O. Box 3000, FI-90014, University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
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Language: English
Published: IOP Publishing, 2021
Publish Date: 2021-05-19


Cyanide, among with NOₓ, CO₂, and CO, is one of the adverse compounds that form in the ironmaking and steelmaking industry. High-temperature processes are suitable environments for cyanide formation, and cyanide can form as a result of recombination in electric arc plasma. Even though the cyanides might not survive e.g. the post-combustion process, understanding the formation mechanisms of hazardous materials in the steelmaking industry is important. In this work, the recombination of cyanide in a pilot-scale AC electric arc furnace is studied with optical emissions from the CN molecule. The results show how the optical emissions from the cyanide change in different process steps. Electric input, plasma temperature, and interaction of the arc with solid charge material were observed to have an impact on the CN signal. Additionally, equilibrium composition computation highlights how different sources of carbon change the recombination rate and that the highest recombination occurs at 6821 K.

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Series: Plasma research express
ISSN: 2516-1067
ISSN-E: 2516-1067
ISSN-L: 2516-1067
Volume: 3
Issue: 2
Article number: 025008
DOI: 10.1088/2516-1067/abfc2a
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: We acknowledge the support of Research Fund for Coal and Steel under grant agreement No. 709 923, Academy of Finland for Genome of Steel grant No. 311 934, Business Finland for grant No. 4478/31/2019, and Steel and Metal Producers' Fund for a 2020 postgraduate grant.
Academy of Finland Grant Number: 311934
Detailed Information: 311934 (Academy of Finland Funding decision)
Copyright information: © 2021 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.