Título

REDUCTION BEHAVIOR OF CHARCOAL COMPOSITE IRON OXIDE PELLETS INCLUDING RESIDUAL VOLATILE MATTER

REDUCTION BEHAVIOR OF CHARCOAL COMPOSITE IRON OXIDE PELLETS INCLUDING RESIDUAL VOLATILE MATTER

Autoria

Konishi, Hirokazu; Ichikawa, Kazuhira; Usui, Tateo

DOI

10.5151/5463-5463-0012

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Resumo

Japanese cypress were carbonized partly at maximum carbonization temperatures (TC, max = 823, 1073 and 1273 K) in order to obtain semi-charcoal with residual volatile matter (V.M.). Charcoal composite pellets using such semi-charcoal including residual V.M. have been prepared and reduced at reduction temperature (TR) in N2 gas atmosphere. Fractional reduction F(%) after 60 min of the semi- charcoal composite pellet at TC, max = 823 K was 20 % and over 40 % at TR = 1073 and 1173 K, respectively, and was higher than any other pellets. When TC, max was lower, namely the pellet had more residual V.M., the reduction of iron oxide was more accelerated at TR = 1073 and 1173 K. Fractional reductions F(%) of all the semi- charcoal composite pellets were over 90 % for 60 min at TR = 1273 K. On the other hand, fractional reduction F(%) of the semi-charcoal composite pellet at TC, max = 1073 K using semi-charcoal particle with the size of 23

 

Japanese cypress were carbonized partly at maximum carbonization temperatures (TC, max = 823, 1073 and 1273 K) in order to obtain semi-charcoal with residual volatile matter (V.M.). Charcoal composite pellets using such semi-charcoal including residual V.M. have been prepared and reduced at reduction temperature (TR) in N2 gas atmosphere. Fractional reduction F(%) after 60 min of the semi- charcoal composite pellet at TC, max = 823 K was 20 % and over 40 % at TR = 1073 and 1173 K, respectively, and was higher than any other pellets. When TC, max was lower, namely the pellet had more residual V.M., the reduction of iron oxide was more accelerated at TR = 1073 and 1173 K. Fractional reductions F(%) of all the semi- charcoal composite pellets were over 90 % for 60 min at TR = 1273 K. On the other hand, fractional reduction F(%) of the semi-charcoal composite pellet at TC, max = 1073 K using semi-charcoal particle with the size of 23

Palavras-chave

Ironmaking; Volatile matter; Charcoal; Carbon composite pellet.

Ironmaking; Volatile matter; Charcoal; Carbon composite pellet.