Proceedings of the Ironmaking, Iron Ore and Agglomeration Seminars


ISSN 2594-357X

Title

PREPARATION AND REDUCTION BEHAVIOR OF CARBON COMPOSITE PELLETS USING SEMI-CHARCOAL

PREPARATION AND REDUCTION BEHAVIOR OF CARBON COMPOSITE PELLETS USING SEMI-CHARCOAL

DOI

10.5151/2594-357X-22145

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Abstract

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.

Keywords

Carbon composite pellet; Charcoal; Reduction of iron oxide, Carbonization.

Carbon composite pellet; Charcoal; Reduction of iron oxide, Carbonization.

How to refer

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