Kinetic of Self-Reducing Mixtures of Iron Ore and Biomass of Elephant Grass

E.P. Rocha; José Adilson de Castro; Flavia de Paula Vitoretti; F.V. Junior

doi:10.4028/www.scientific.net/MSF.869.1007

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HomeMaterials Science ForumMaterials Science Forum Vol. 869Kinetic of Self-Reducing Mixtures of Iron Ore and...

Kinetic of Self-Reducing Mixtures of Iron Ore and Biomass of Elephant Grass

Abstract:

In this work, kinetic runs of self-reducing mixtures composed by pellet feed, BOF dust and biomass of elephant grass were performed using TGA-DSC method, for the temperatures, 900, 950, 1000, 1050 and 1100°C, and carbon percentages (15, 20 and 30% of carbon). The converted fraction versus time was calculated, and the different regions of the reactions progress were selected to analyze the reactions kinetics that occur in the mixture (devolatilization of biomass, Boudouard and sequence of reduction reactions). The kinetic behavior for the different steps showed good agreement with the first-order kinetic law. Using Arrhenius plot, was possible to estimate the apparent activation energy values obtained for the reaction mechanisms corresponding to Fe₃O₄→FeO and FeO→Fe. The kinetic constants for the 1100°C temperature and mixture containing 30% of carbon were the higher values: 0.0037 s^-1for the reaction Fe₃O₄ → FeO and 0.0258 s^-1 for the mechanism FeO →Fe.

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21st Brazilian Conference on Materials Science and Engineering

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Materials Science Forum (Volume 869)

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1007-1012

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https://doi.org/10.4028/www.scientific.net/MSF.869.1007

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Online since:

August 2016

Authors:

E.P. Rocha*, José Adilson de Castro, Flavia de Paula Vitoretti, F.V. Junior

Keywords:

Biomass, BOF Dust, KINECT, Self-Reducing Pellets

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