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Research Article

Reduction of NOx emission based on optimizing the proportions of mill scale and coke breeze during sintering process

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  • Received: 4 March 2020Revised: 18 May 2020Accepted: 19 May 2020Available online: 21 May 2020
  • How to cost-effectively reduce NOx emission of iron ore sintering process is a new challenge for iron and steel industry at present. The effects of proportion of mill scale and coke breeze on the NOx emission, strength of sinter and sinter indexes were studied by combustion tests and sinter pot tests. Results showed that the fuel-N’s conversion rate decreased with increasing of the proportions of mill scale. Because NO was reduced to N2 by Fe3O4, FeO and Fe in mill scale. The strength of sinter reached a highest value at 8.0 wt% mill scale due to the formation of low melting point minerals. Meanwhile, the fuel-N’s conversion rate slightly increased and total NOx emission significantly decreased with the proportions of coke breeze increased. Because CO formation and contents of N element in sintered mixture decreased. However, the strength of sinter was also decreased since the decreasing of the melting minerals. In addition, results of sinter pot tests indicated that NOx emission obviousely decreased and sinter indexes have good performances when the proportions of mill scale and coke breeze were 8.0 wt% and 3.70 wt% in sintered mixture.
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Reduction of NOx emission based on optimizing the proportions of mill scale and coke breeze during sintering process

  • Corresponding author:

    Zhi-gang Que    E-mail: quezhigang@126.com

  • 1. Institute of Energy Conversion, Jiangxi Academy of Science, Nanchang 330096, China
  • 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract: How to cost-effectively reduce NOx emission of iron ore sintering process is a new challenge for iron and steel industry at present. The effects of proportion of mill scale and coke breeze on the NOx emission, strength of sinter and sinter indexes were studied by combustion tests and sinter pot tests. Results showed that the fuel-N’s conversion rate decreased with increasing of the proportions of mill scale. Because NO was reduced to N2 by Fe3O4, FeO and Fe in mill scale. The strength of sinter reached a highest value at 8.0 wt% mill scale due to the formation of low melting point minerals. Meanwhile, the fuel-N’s conversion rate slightly increased and total NOx emission significantly decreased with the proportions of coke breeze increased. Because CO formation and contents of N element in sintered mixture decreased. However, the strength of sinter was also decreased since the decreasing of the melting minerals. In addition, results of sinter pot tests indicated that NOx emission obviousely decreased and sinter indexes have good performances when the proportions of mill scale and coke breeze were 8.0 wt% and 3.70 wt% in sintered mixture.

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