A Kinetic Study Investigating the Carbothermic Recovery of Chromium from a Stainless-Steel Slag
| Autor: | Stefan Steinlechner, Jürgen Antrekowitsch, Manuel Leuchtenmüller |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Structural material Metallurgy 0211 other engineering and technologies Metals and Alloys Ferroalloy chemistry.chemical_element Slag 02 engineering and technology Contamination Condensed Matter Physics 01 natural sciences Chromium chemistry.chemical_compound chemistry Mechanics of Materials visual_art Scientific method 0103 physical sciences Materials Chemistry visual_art.visual_art_medium Chromium oxide Hexavalent chromium 021102 mining & metallurgy |
| Zdroj: | Metallurgical and Materials Transactions B. 50:2221-2228 |
| ISSN: | 1543-1916 1073-5615 |
| DOI: | 10.1007/s11663-019-01649-2 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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