ISSN 2594-357X
35º Seminário de Redução de Minério de Ferro e Matérias-Primas — Vol. 01 , num. 35 (2005)
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Abstract
To establish revolutionary energy saving in blast furnace ironmaking, lowering thermal reserve zone temperature is suggested to be the most effective action in the research project conducted in Japan from 2000 to 2004. In this study, using coal composite iron ore hot briquette (CCB) and coal char composite iron ore pellet (CCP), cause and results of lowering the thermal reserve zone temperature were studied at 800°C to 1000°C. Rate of gasification reaction for carbon in CCB and CCP, powdery coke and dist coke was measured. Rate of carbon in CCB was much faster than coke, although much slower than carbon in CCP. The influence of lowering the temperature where wustite is formed from hematite on reduction rate of the wustite was studied. It is clearly proved that lowering the temperature is very effective to remarkably enhance reduction of the wustite. Results of test applying CCB in a blast furnace simulator were reviewed. CCB packed in layer-by-layer with coke lowered the thermal reserve zone temperature from about 1000°C to about 800°C by about 200°C. Lowering significantly increased the utilization efficiency of the blast furnace gas, namely a significant decrease in the coke ratio of blast furnace.
To establish revolutionary energy saving in blast furnace ironmaking, lowering thermal reserve zone temperature is suggested to be the most effective action in the research project conducted in Japan from 2000 to 2004. In this study, using coal composite iron ore hot briquette (CCB) and coal char composite iron ore pellet (CCP), cause and results of lowering the thermal reserve zone temperature were studied at 800°C to 1000°C. Rate of gasification reaction for carbon in CCB and CCP, powdery coke and dist coke was measured. Rate of carbon in CCB was much faster than coke, although much slower than carbon in CCP. The influence of lowering the temperature where wustite is formed from hematite on reduction rate of the wustite was studied. It is clearly proved that lowering the temperature is very effective to remarkably enhance reduction of the wustite. Results of test applying CCB in a blast furnace simulator were reviewed. CCB packed in layer-by-layer with coke lowered the thermal reserve zone temperature from about 1000°C to about 800°C by about 200°C. Lowering significantly increased the utilization efficiency of the blast furnace gas, namely a significant decrease in the coke ratio of blast furnace.
Keywords
Self-reducing pellet, High reactivity, Thermal-reserve zone.
Self-reducing pellet, High reactivity, Thermal-reserve zone.
How to cite
Iguchi, Yoshiaki.
THE DIRECT AND INDIRECT REACTIONS IN SELF-REDUCING PELLET AND ITS BEHAVIOR IN A MOVING BED LIKE BLAST FURNACE,
p. 188-195.
In: 35º Seminário de Redução de Minério de Ferro e Matérias-Primas,
São Paulo - SP, Brasil,
2005.
ISSN: 2594-357X, DOI 10.5151/2594-357x-35Red - 188-195
