Conditions for Minimizing Direct Reduction in Smelting Reduction Iron Making
SCIE
SCOPUS
- Title
- Conditions for Minimizing Direct Reduction in Smelting Reduction Iron Making
- Authors
- Shim, Yang-Sub; JUNG, SUNGMO
- Date Issued
- 2018-02
- Publisher
- IRON STEEL INST JAPAN KEIDANREN KAIKAN
- Abstract
- In a 2 stage-smelting reduction process, it is favorable to lower the reduction degree of iron ore in a
pre-reducing unit by lowering its temperature to avoid any troubles due to stickiness of high reduced iron
ore. However, less pre-reduced iron ore can induce direct reduction in a melter-gasifier, which can increase
coal ratio. In this case, the direct reduction ratio is determined by the reducibility of Pre-Reduced Iron ore
(PRI) and the reactivity of coal with CO2. PRI was made into pellets and its reducibility was measured in
various temperatures and H2 contents. Coal was carbonized in melter-gasifier condition and then its reactivity
with CO2 was measured in various temperatures and CO2 contents. The possibility that direct reduction
takes place in a melter-gasifier was high because the PRI pellet was reduced more slowly than
unreduced iron ore and the char reacted more actively than coke. The direct reduction rate in a meltergasifier
was roughly drawn as the product of the CO2 content in the ascending gas and the reaction rate
constant of coal with CO2 and the way to minimize the direct reduction ratio was discussed with that
diagram.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/41173
- DOI
- 10.2355/isijinternational.ISIJINT-2017-479
- ISSN
- 0915-1559
- Article Type
- Article
- Citation
- ISIJ INTERNATIONAL, vol. 58, no. 2, page. 274 - 281, 2018-02
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