Abstract
In 2018, the stainless-steel industry produced > 10 million tons of slag, which for the most part was landfilled because of chromium oxide contamination. Long-term studies indicate a possible formation of soluble hexavalent chromium, which is classified as carcinogenic. Recent research focuses on the development of a treatment technology to recover chromium from the slag into a ferroalloy, producing an oxidic material that can be utilized in the construction industry. To date, there has been no literature dealing with the kinetics of a carbothermic treatment process to result in a model to predict the necessary treatment time. The present article fills this gap by investigating the reduction kinetics of chromium oxide of a process close to practical applications. Based on experimental measurements, a model has been developed to predict the necessary treatment time to reach a specific final chromium concentration as a function of the starting concentration and required process temperature in the range between 1600 °C and 1700 °C. Finally, presented findings can serve as a guideline to develop kinetic models in similar pyrometallurgical recovery processes.
Similar content being viewed by others
References
ISSF: Stainless Steel in Figures 2019, http://www.worldstainless.org/Files/issf/non-image-files/PDF/ISSF_Stainless_Steel_in_Figures_2019_English_public_version.pdf. Accessed 24 Jun 2019
G. Stubbe, G. Harp, D. Schmidt, and M. Sedlmeier: Stahl Eisen, 2011, vol. 131, pp. 45–50.
D. Durinck, F. Engström, S. Arnout, J. Heulens, P. T. Jones, B. Björkman, B. Blanpain, P. Wollants: Resour. Conserv. Recycl., 2008, 52, 1121–31.
D. Mudersbach, M. Kuehn, J. Geiseler, and K. Koch: Slag Valorisation Symp., eds. P.T. Jones, D. Geysen, M. Guo, and B. Blanpain, 2009.
B. Adamczyk, R. Brenneis, C. Adam, and D. Mudersbach: Steel Res. Int., 2010, vol. 81, pp. 1078–83.
T. Nakasuga, K. Nakashima, and K. Mori: ISIJ Int., 2004, vol. 44, pp. 665–72.
E. Shibata, S. Egawa, and T. Nakamura: ISIJ Int., 2002, vol. 42, pp. 609–13.
B. Arh, F. Vode, F. Tehovnik, and J. Burja: Metalurgija, 2015, vol. 54, pp. 368–70.
G. Ye, E. Burstrom, M. Kuhn, and J. Piret: Scand. J. Metall., 2003, vol. 32, pp. 7–14.
A. Fleischanderl, U. Gennari, and A. Ilie: Ironmaking Steelmaking, 2004, vol. 31, pp. 444–49.
M. Mortimer and P. Taylor: Chemical kinetics and mechanism, Royal Society of Chemistry : Open University, Cambridge, UK, 2002. pp. 35-36 & 65–66
P. W. Atkins and J. de Paula: Atkins’ physical chemistry, 10th ed., Oxford University Press, Oxford, 2014. pp. 788–89
T. Mori, J. Yang, and M. Kuwabara: ISIJ Int., 2007, vol. 47, pp. 1387–93.
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Manuscript submitted April 14, 2019.
Rights and permissions
About this article
Cite this article
Leuchtenmüller, M., Antrekowitsch, J. & Steinlechner, S. A Kinetic Study Investigating the Carbothermic Recovery of Chromium from a Stainless-Steel Slag. Metall Mater Trans B 50, 2221–2228 (2019). https://doi.org/10.1007/s11663-019-01649-2
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11663-019-01649-2