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Kinetic investigation of synthetic zinc ferrite reduction by hydrogen

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Abstract

Zinc ferrite is one of the main components present in the electric arc furnace dust. Furthermore, it is necessary to know the mechanisms involved on the zinc ferrite to determine a process for reusing the electric arc furnace dust. Thus, the aim of this paper is to evaluate the kinetic parameters of the reduction of synthetic zinc ferrite pellets by mixture containing hydrogen. The kinetic investigation was performed via Forced Stepwise Isothermal Analysis method in the temperature range of 500–950 °C. The reducing gas was a mixture of hydrogen (10%) and argon (90%). In addition, Thermo-cal software was used in order to support the reduction reaction behavior. The results indicated that between 550 and 750 °C only iron oxide was reduced. In this step, the nucleation was found to be the controlling mechanism, and an activation energy of 84.9 kJ mol−1 was determined. In temperature >800 °C, it was noted an influence of diffusion on the reduction reaction. Images obtained from scanning electron microscope suggested a change in the pellets microstructure after this temperature presenting a sintered structure. The activation energy of 188 kJ mol−1 was determined at this step.

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Acknowledgements

The authors would like to thank FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) process 11/51638-0, the CNPq (Conselho Nacional de desenvolvimento Científico e Tecnológico), process 245470/2012-3, the CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), project PE003/2008, University of São Paulo and University of Extremo Sul Catarinense.

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Authors and Affiliations

  1. Universidade do Extremo Sul Catarinense, Av. Universitaria, 1105, Criciúma, SC, 88806-000, Brazil

    Eduardo Junca & Felipe Fardin Grillo

  2. Universidade de Sorocaba, Rod Raposo Tavares km 92, Sorocaba, SP, 18023-000, Brazil

    Thomaz Augusto Guisard Restivo

  3. Instituto Federal de Educação, Ciências e Tecnologia do Estado do Espírito Santo, Av. Vitória, 1729 - Jucutuquara, Vitória, ES, 29040-780, Brazil

    José Roberto de Oliveira

  4. Departamento de Engenharia Química da Universidade de 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. Felipe Fardin Grillo
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  3. Thomaz Augusto Guisard Restivo
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  4. José Roberto de Oliveira
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  5. Denise Crocce Romano Espinosa
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  6. Jorge Alberto Soares Tenório
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Correspondence to Eduardo Junca.

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Junca, E., Grillo, F.F., Restivo, T.A.G. et al. Kinetic investigation of synthetic zinc ferrite reduction by hydrogen. J Therm Anal Calorim 129, 1215–1223 (2017). https://doi.org/10.1007/s10973-017-6222-7

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  • DOI: https://doi.org/10.1007/s10973-017-6222-7

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