Kinetics for Iron Oxide in Reduction Process of Fe2O3-SiO2-Al2O3-CaO System

WANG Shuai; LI Guofeng; YANG Hanxu; ZHAO Libing; LIU Liwei

doi:10.13779/j.cnki.issn1001-0076.2019.01.001

2019 Vol. 39, No. 1

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Article navigation > Conservation and Utilization of Mineral Resources > 2019 > 39(1): 1-4, 9

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WANG Shuai, LI Guofeng, YANG Hanxu, ZHAO Libing, LIU Liwei. Kinetics for Iron Oxide in Reduction Process of Fe2O3-SiO2-Al2O3-CaO System[J]. Conservation and Utilization of Mineral Resources, 2019, 39(1): 1-4, 9. doi: 10.13779/j.cnki.issn1001-0076.2019.01.001

Citation:

WANG Shuai, LI Guofeng, YANG Hanxu, ZHAO Libing, LIU Liwei. Kinetics for Iron Oxide in Reduction Process of Fe₂O₃-SiO₂-Al₂O₃-CaO System[J]. Conservation and Utilization of Mineral Resources, 2019, 39(1): 1-4, 9. doi: 10.13779/j.cnki.issn1001-0076.2019.01.001

Kinetics for Iron Oxide in Reduction Process of Fe₂O₃-SiO₂-Al₂O₃-CaO System

College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China

Received Date: 08 August 2018

Publish Date: 25 February 2019

Abstract

Abstract

The kinetics of coal-based reduction process of Fe₂O₃-SiO₂-Al₂O₃-CaO system was studied isothermally and non-isothermally combining with the change rules of reduction degree and reduction rate. Experimental results showed that the reduction degree and reduction rate of coal-based reduction process of Fe₂O₃-SiO₂-Al₂O₃-CaO system were influenced by reduction temperature obviously. Mechanism function of entire isothermal coal-based reduction process was in accordance with Avrami-Erofeev kinetic model, and the reaction was controlled by the process of nucleation and development. The apparent activation energy and pre-exponential of isothermal coal-based reduction process were 288.21 kJ/mol and 1.15×10⁹ min^-1. Non-isothermal coal-based reduction process could be divided into initial, intermediate and final period. As the main reaction stage, the mechanism function of intermediate period also accorded with Avrami-Erofeev kinetic model. The apparent activation energy and pre-exponential of intermediate period were 272.60 kJ/mol and 1.24×10⁹ min^-1, respectively. The above research lays the foundation for further analysis of reduction kinetics of oolitic hematite ore.
- deep reduction /
- kinetics /
- Fe₂O₃-SiO₂-Al₂O₃-CaO system

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References

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