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Migration behaviors and kinetics of phosphorus during coal-based reduction of high-phosphorus oolitic iron ore

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Abstract

To understand the migration mechanisms of phosphorus (P) during coal-based reduction, a high-phosphorus oolitic iron ore was reduced by coal under various experimental conditions. The migration characteristics and kinetics of P were investigated by a field-emission electron probe microanalyzer (FE-EPMA) and using the basic principle of solid phase mass transfer, respectively. Experimental results showed that the P transferred from the slag to the metallic phase during reduction, and the migration process could be divided into three stages: phosphorus diffusing from the slag to the metallic interface, the formation of Fe-P compounds at the slag-metal interface and P diffusing from the slag-metal interface to the metallic interior. The reduction time and temperature significantly influenced the phosphorus content of the metallic and slag phases. The P content of the metallic phase increased with increasing reduction time and temperature, while that of the slag phase gradually decreased. The P diffusion constant and activation energy were determined and a migration kinetics model of P in coal-based reduction was proposed. P diffusion in the metallic phase was the controlling step of the P migration.

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Acknowledgement

This work was financially supported by the National Natural Science Foundation of China (No. 51604063).

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  1. School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China

    Yong-sheng Sun, Yan-feng Li, Yue-xin Han & Yan-jun Li

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  1. Yong-sheng Sun
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Correspondence to Yong-sheng Sun.

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Sun, Ys., Li, Yf., Han, Yx. et al. Migration behaviors and kinetics of phosphorus during coal-based reduction of high-phosphorus oolitic iron ore. Int J Miner Metall Mater 26, 938–945 (2019). https://doi.org/10.1007/s12613-019-1810-0

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  • DOI: https://doi.org/10.1007/s12613-019-1810-0

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