2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 9. Iron and Steel, Metals and Alloys

Editors:Kongoli F, Conejo A, Gomez-Marroquin MC
Publisher:Flogen Star OUTREACH
Publication Year:2017
Pages:242 pages
ISBN:978-1-987820-77-5
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
CD-SIPS2017_Volume1
CD shopping page

    Self-Reducing Agglomerates: Metallization, Phase Morphologies and Carburization Kinetics

    Edelink Efrain Tinoco Falero1; Jose Carlos D Abreu1; Karla Ohler - Martins2;
    1PUC-RIO, Rio de Janeiro, Brazil; 2UNIVERSITY OF APPLIED SCIENCES RUHR WEST, Mulheim, Germany (Deutschland);
    Type of Paper: Keynote
    Id Paper: 173
    Topic: 2

    Abstract:

    Assessments on the metallic iron phase morphology and carbon content, regarding the reduction of composite briquettes, were originally obtained. Targeting to appraise the nucleation, growth and the carburizing evolution of the metallic iron phase, the briquettes were firstly reduced in temperatures from 1000 to 1350�C, during times ranging from 5 to 45 minutes, under CO and N2 atmospheres. With the objective to define the microstructures formed along the briquette�s cross sections, they were examined in Optical and SEM microscopes and submitted to a Chemical Micro Analyzer. Four metallic iron phase morphologies were characterized: i) iron granules, generated during the initial reduction times and nucleated at both, the peripheral and core regions; ii) iron whiskers, occurring mainly at the briquette�s core and for short reduction times; iii) sintered and dense external continuous iron layer, located at the periphery and formed for longer times, and iv) iron globules, generated from previously molten carburized iron phases, sited at the briquette�s core for longer reduction times. The following carbon percentage were obtained in the main iron phases: i) iron globules: from 3.8 to 4.6%C, for CO atmosphere, and from 3.5 to 4.5%C, for N2; ii) continuous iron layer: from 0.5 to 1.3%C, for CO atmosphere, and from 0.7 to 0.9%C, for N2 furnace atmosphere.
    Finally, regarding the carburization kinetics of the liquid iron phase, the following parameters were calculated: i) 26.4 kJ/molC, for apparent activation energy; ii) 46.9 MHz, for frequency factor.

    Keywords:

    Ferrous; Iron; Metallurgy; Pellets; Steel; Sustainability;

    Full Text:

    Click here to access the Full Text

    Cite this article as:

    Tinoco Falero E, D Abreu J, Ohler - Martins K. (2017). Self-Reducing Agglomerates: Metallization, Phase Morphologies and Carburization Kinetics. In Kongoli F, Conejo A, Gomez-Marroquin MC (Eds.), Sustainable Industrial Processing Summit SIPS 2017 Volume 9. Iron and Steel, Metals and Alloys (pp. 147-148). Montreal, Canada: FLOGEN Star Outreach