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Firstly, aiming to establish the thermodynamical conditions for the feasibility of the manganese oxide reduction, phase diagrams for the Mn-C-O system were drawn, considering different activities for reagents and products. Further, experiments to investigate the reduction progress were done, encompassing temperatures from 900 to 1300°C and using composite briquettes containing manganese oxides and charcoal. From the results obtained, a kinetic reduction model involving two phenomenological stages was proposed. The first reduction stage occurs in a short reaction time, up to 10 minutes. This phase is followed by a second stage, characterized by the decrease of the conversion fraction and shows a further transformation of the product generated in the first reduction stage. For the first stage the apparent activation energy was Ea = 11.50 kJ/mol and the frequency factor ko = 57
Firstly, aiming to establish the thermodynamical conditions for the feasibility of the manganese oxide reduction, phase diagrams for the Mn-C-O system were drawn, considering different activities for reagents and products. Further, experiments to investigate the reduction progress were done, encompassing temperatures from 900 to 1300°C and using composite briquettes containing manganese oxides and charcoal. From the results obtained, a kinetic reduction model involving two phenomenological stages was proposed. The first reduction stage occurs in a short reaction time, up to 10 minutes. This phase is followed by a second stage, characterized by the decrease of the conversion fraction and shows a further transformation of the product generated in the first reduction stage. For the first stage the apparent activation energy was Ea = 11.50 kJ/mol and the frequency factor ko = 57
Palavras-chave
Manganese ore; Self-reduction; Kinetics; Composite agglomerates.
Manganese ore; Self-reduction; Kinetics; Composite agglomerates.
Como citar
Benique, Ferry Belisario;
D’Abreu, Jose Carlos;
Kohler, Helio Marques;
Rodrigues, Raimundo Nonato.
CARBOTHERMIC SELF-REDUCTION OF AGGLOMERATES CONTAINING MANGANESE OXYDE
,
p. 208-216.
In: 7th Japan-Brazil Syposium on Dust Processing-Energy-Environment and 1st International Seminar On Self-Reducing and Cold Bonded Agglomeration,
São Paulo,
2008.
ISSN: -
, DOI 10.5151/5463-5463-0023
