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

Yong-sheng Sun; Yan-feng Li; Yue-xin Han; Yan-jun Li

doi:10.1007/s12613-019-1810-0

Volume 26 Issue 8

Aug. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(8): 938-945

Yong-sheng Sun, Yan-feng Li, Yue-xin Han, and Yan-jun Li, Migration behaviors and kinetics of phosphorus during coal-based reduction of high-phosphorus oolitic iron ore, Int. J. Miner. Metall. Mater., 26(2019), No. 8, pp. 938-945. https://doi.org/10.1007/s12613-019-1810-0

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Yong-sheng Sun, Yan-feng Li, Yue-xin Han, and Yan-jun Li, Migration behaviors and kinetics of phosphorus during coal-based reduction of high-phosphorus oolitic iron ore, Int. J. Miner. Metall. Mater., 26(2019), No. 8, pp. 938-945. https://doi.org/10.1007/s12613-019-1810-0

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Research Article

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

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Corresponding author:
Yong-sheng Sun E-mail: yongshengsun@mail.neu.edu.cn
Received: 24 August 2018; Revised: 11 March 2019; Accepted: 12 March 2019

Abstract

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.
- high-phosphorus oolitic iron ore;
- coal-based reduction;
- phosphorus migration;
- kinetics

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