Removal mechanism of phosphorus by carbothermic reduction of steel slag

The high-P content in steel slag limits its utilization in the next heats of steelmaking. In this work, P -containing slag was reduced by carbon at high temperatures with flowing N . The P-containing substances in the off-gas were collected after water cooling. Both XRD analysis and thermodynamic ca...

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Bibliographic Details
Published in:High temperature materials and processes 2019-01, Vol.38 (2019), p.905-915
Main Authors: Xue, Yuekai, Li, Chenxiao, Zhou, Chaogang, Zhao, Dingguo, Wang, Shuhuan
Format: Article
Language:English
Subjects:
Converter
Kinetics
Reduction
steel slag
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Summary:The high-P content in steel slag limits its utilization in the next heats of steelmaking. In this work, P -containing slag was reduced by carbon at high temperatures with flowing N . The P-containing substances in the off-gas were collected after water cooling. Both XRD analysis and thermodynamic calculations indicate that the gas produced by P reduction is mainly composed of P . The actual reduction Gibbs free energy of P is less than that of FeO; while the reduction rate of FeO is higher than that of P due to the good kinetic conditions and the low activation energy. The reduction of P agrees well with the second-order reaction, whose reduction rate is controlled by the mass transfer in the slag. The reduction of FeO agrees well with the first-order reaction, whose reduction rate is mainly controlled by the interface chemical reaction.
ISSN:0334-6455
2191-0324
DOI:10.1515/htmp-2019-0057