Consumption of residual char in blast furnace during coal injection -- Slag/carbon/gas interactions
Conference
·
OSTI ID:577437
- Univ. of New South Wales, Sydney, New South Wales (Australia). Co-operative Research Centre for Black Coal Utilisation
- Quebec Cartier Mining Co., Bethlehem, PA (United States)
One of the factors limiting the maximum rate of coal injection in the blast furnace is the accumulation of unburnt char. The interaction of unburnt char with slag, hot metal and the gaseous phases could have a significant influence on char assimilation. This work examines the interaction of a low iron oxide bearing slag with different carbonaceous substrates with varying levels of ash content (0.05%--12.25%). Experiments were conducted in a high temperature tube furnace at 1,500 C (2,732 F) in an argon atmosphere, and the slag/carbon/gas interactions were studied in-situ. The results showed that ash content and composition of the carbonaceous substrates influenced their wettability by the slag. With good wetting, there is a significant decrease in the contact angle from the initiation of melting. The carbonaceous materials that showed good wetting were reacting with the slag phase and resulting in a change in the slag composition. The consumption of carbon could occur when it is in contact with a slag bearing appreciable levels of iron oxide, for example. The kinetics of iron oxide reduction reaction could dictate the consumption rate of carbon in a char present in the blast furnace during coal injection. The dissolution of ash components in a char into the slag phase could also result in the consumption of char during coal injection. These research topics are currently under investigation at the CRC for Black Coal Utilisation in the School of Materials Science and Engineering UNSW, Sydney; the investigation presented here forms a part of the overall study.
- OSTI ID:
- 577437
- Report Number(s):
- CONF-9704181--; ISBN 1-886362-23-8
- Country of Publication:
- United States
- Language:
- English
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