Carbon Gasification in Self-reducing Mixtures

被引:19
作者
Bagatini, Mauricio Covcevich [1 ]
Zymla, Victor [2 ]
Osorio, Eduardo [3 ]
Faria Vilela, Antonio Cezar [3 ]
机构
[1] Univ Fed Minas Gerais, Lab Met Proc, BR-31270901 Belo Horizonte, MG, Brazil
[2] Ecole Cent Paris, Chem & Mat Engn Lab LGPM, F-92295 Chatenay Malabry, France
[3] Univ Fed Rio Grande do Sul, Iron & Steel Making Lab Lasid PPGE3M, BR-91501970 Porto Alegre, RS, Brazil
关键词
scale recycling; self-reduction; Boudouard reaction; thermogravimetry; reductant reactivity; iron morphology; IRON-ORE PELLETS; PART II; REDUCTION; COMPOSITE; COAL; KINETICS; OXIDE; MECHANISM; HEMATITE; VACUUM;
D O I
10.2355/isijinternational.54.2687
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Self-reduction experiments of mill scale with four potential carbonaceous reductants (charcoal, coal char, blast furnace coke and petroleum coke) were carried out by thermogravimetry (TG) in order to choose one allowing the highest reduction rate and overall conversion. The fastest rate of self-reduction was measured for the charcoal and the slowest for the petroleum coke. The Friedman method of kinetics data analysis was used to calculate apparent activation energy at different conversion rates. Based on these values it can be concluded that the Boudouard reaction controls the rate of self-reduction with charcoal up to about 60% of conversion and even more for others reductants. It has also been demonstrated that the morphology of the iron produced strongly depends on reactivity of carbonaceous reductant.
引用
收藏
页码:2687 / 2696
页数:10
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