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Reduction of electric arc furnace dust pellets by simulated reformed natural gas

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Abstract

The purpose of this paper is to study the kinetic reaction of electric arc furnace dust pellets using a reducing gas simulating the reformed natural gas. The kinetic investigation was accomplished via forced stepwise isothermal analysis method. The tests were programmed in the range of 500–1000 °C. It was used a reducing gas contained 25 % of CO and 75 % of H2. X-ray patterns were analyzed in order to understand the reduction process. The results show the reduction of electric arc furnace dust pellet occurs in three steps. At 550–650 °C, the zinc ferrite is reduced to magnetite and zinc oxide, followed by the reduction of magnetite to wustite. Carbon deposition on the pellet surface was detected in this step, which impairs the kinetic analysis. In the range of 700–800 °C, wustite is reduced to iron. It was determined a mixed control between nucleation and diffusion with E a of 89.2 kJ mol−1. At 850–950 °C, the main reaction is zinc oxide reduction to gaseous zinc. However, wustite reduction is also observed. The E a of 135.5 kJ mol−1 with a mixed control between diffusion and chemical reaction was detected.

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Acknowledgements

The authors would like to thank FAPESP (the State of São Paulo’s Research Support Foundation) process 11/51638-0, the CNPq (National Council for Scientific and Technological Development) process 245470/2012-3, the CAPES (Coordination for the Improvement of Higher Education Personnel) Foundation, project PE003/2008, FAPES (the State of Espírito Santo’s Research and innovation Support Foundation), process 68853777/14, University of São Paulo and Federal Institute of Education, Science and Technology of Espírito Santo.

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Authors and Affiliations

  1. Federal Institute of Education, Science and Technology of Espírito Santo, Av. Vitória, 1729 - Jucutuquara, Vitória, ES, 29040-780, Brazil

    Eduardo Junca & José Roberto de Oliveira

  2. UNISO – University of Sorocaba, Rod Raposo Tavares km 92, Sorocaba, SP, 18023-000, Brazil

    Thomaz Augusto Guisard Restivo

  3. Department of Chemical Engineering of the University of São Paulo, Av. Prof. Lineu Prestes, 580, São Paulo, SP, 05424-970, Brazil

    Denise Crocce Romano Espinosa & Jorge Alberto Soares Tenório

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  1. Eduardo Junca
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  2. Thomaz Augusto Guisard Restivo
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  3. José Roberto de Oliveira
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Correspondence to Eduardo Junca.

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Junca, E., Restivo, T.A.G., de Oliveira, J.R. et al. Reduction of electric arc furnace dust pellets by simulated reformed natural gas. J Therm Anal Calorim 126, 1889–1897 (2016). https://doi.org/10.1007/s10973-016-5629-x

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