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Metallurgical and Materials Transactions B

, Volume 50, Issue 5, pp 2221–2228 | Cite as

A Kinetic Study Investigating the Carbothermic Recovery of Chromium from a Stainless-Steel Slag

  • Manuel LeuchtenmüllerEmail author
  • Jürgen Antrekowitsch
  • Stefan Steinlechner
Article
  • 103 Downloads

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.

Notes

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Manuel Leuchtenmüller
    • 1
    Email author
  • Jürgen Antrekowitsch
    • 1
  • Stefan Steinlechner
    • 1
  1. 1.Chair of Nonferrous MetallurgyMontanuniversitaet LeobenLeobenAustria

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