ISSN 2594-357X
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Japanese cypress was carbonized partly at maximum carbonization temperature TC, max = 823, 1,073 and 1,273 K in order to obtain semi-charcoal with some residual volatile matter (V.M.). The semi-charcoal obtained at TC, max = 823 K retained much V.M., mainly H2. The gasification of semi-charcoal and coke samples were carried out at gasification temperature TG = 1,073 K, 1,173 K and 1,273 K in CO2 gas atmosphere. The gasification rate of a semi-charcoal sample obtained at TC, max = 823 K was the highest, but the difference of rate in all semi-charcoal samples were much small. The activation energy was estimated as 138 kJ/mol, 139 kJ/mol, 162 kJ/mol and 219 kJ/mol, respectively for semi-charcoal obtained at TC, max = 823 K, 1,073 K, 1,273 K and coke samples. Then, carbon composite pellets using semi-charcoal with the particle size of 63～75 μm have been prepared and reduced at reduction temperature TR = 1,173 K in N2 gas atmosphere. Fractional reduction F(%) after 60 min of the carbon composite pellet using semi-charcoal obtained at TC, max = 823 K was 40%, and was higher than any other pellets. On the other hand, fractional reduction F(%) of carbon composite pellet using semi-charcoal obtained at TC, max = 1,073 K with the particle size of 23～35 μm was 38% for 60 min at TR = 1,173 K, and was higher than any other pellets with the particle sizes of 63～75 μm and 105～150 μm.
Japanese cypress was carbonized partly at maximum carbonization temperature TC, max = 823, 1,073 and 1,273 K in order to obtain semi-charcoal with some residual volatile matter (V.M.). The semi-charcoal obtained at TC, max = 823 K retained much V.M., mainly H2. The gasification of semi-charcoal and coke samples were carried out at gasification temperature TG = 1,073 K, 1,173 K and 1,273 K in CO2 gas atmosphere. The gasification rate of a semi-charcoal sample obtained at TC, max = 823 K was the highest, but the difference of rate in all semi-charcoal samples were much small. The activation energy was estimated as 138 kJ/mol, 139 kJ/mol, 162 kJ/mol and 219 kJ/mol, respectively for semi-charcoal obtained at TC, max = 823 K, 1,073 K, 1,273 K and coke samples. Then, carbon composite pellets using semi-charcoal with the particle size of 63～75 μm have been prepared and reduced at reduction temperature TR = 1,173 K in N2 gas atmosphere. Fractional reduction F(%) after 60 min of the carbon composite pellet using semi-charcoal obtained at TC, max = 823 K was 40%, and was higher than any other pellets. On the other hand, fractional reduction F(%) of carbon composite pellet using semi-charcoal obtained at TC, max = 1,073 K with the particle size of 23～35 μm was 38% for 60 min at TR = 1,173 K, and was higher than any other pellets with the particle sizes of 63～75 μm and 105～150 μm.
Palavras-chave
Carbon composite pellet; Charcoal; Reduction of iron oxide, Carbonization.
Carbon composite pellet; Charcoal; Reduction of iron oxide, Carbonization.
Como citar
Usui, Tateo;
Konishi, Hirokazu;
Ichikawa, Kazuhira;
Ono., Hideki.
PREPARATION AND REDUCTION BEHAVIOR OF
CARBON COMPOSITE PELLETS USING SEMI-CHARCOAL
,
p. 698-709.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-22145
