ORAL

SESSION: IronMonAM-R10	5th Intl. Symp. on Advanced Sustainable Iron and Steel Making
Mon Oct, 23 2017	Room: Maria Mercedes & Maria Beatriz
Session Chairs: Tateo Usui; Mery-Cecilia Gomez-Marroquin; Session Monitor: TBA

11:30: [IronMonAM02] Plenary
[Oxygen applications for sustainable steelmaking/steel melting] Characterization of Peruvian Linz Donawitz-Ld Steel Sludges
Mery-cecilia Gomez Marroquin¹ ; Jose Carlos D Abreu² ; ¹Universidad Nacional de Ingenieria-UNI, Lima, Peru; ²PUC-Rio, Rio de Janeiro, Brazil;
Paper Id: 103 [Abstract]

One of the most important steelmaking industry issues in the world, from the recycling of galvanized steel scrap, is the benefit or provision of the powders produced in electric arc furnaces (EAF) and Converters LD / BOF. Transportation costs, disposal in appropriate places and the increasing environmental demands, are doing many steel companies in the world seek ways to avoid, minimize and/or properly treat their powders and particles. The experimental methodology of this project includes a complete characterization of powders and involved particles; in this case, the LD steel sludges; using chemical analysis by Atomic Absorption Analysis by X-ray diffraction, Microscopies Optical Co-located, and Scanning Electron Microscope-SEM. It is concluded that the complete characterization of this waste, used to treat or process powders, sludges, and fine particles produced by both the Electrical arc furnace (EAF) and Converters LD / FOB, and coking plants as a result of the production process of steel and related.

SESSION: IronTueAM-R10	5th Intl. Symp. on Advanced Sustainable Iron and Steel Making
Tue Oct, 24 2017	Room: Maria Mercedes & Maria Beatriz
Session Chairs: Jose Carlos D Abreu; Paulo Von Kruger; Session Monitor: TBA

11:00: [IronTueAM01] Keynote
[Oxygen applications for sustainable steelmaking/steel melting] 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);
Paper Id: 173 [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.