ISSN 2594-357X
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Abstract
To meet the increase of iron ore price and depletion of high grade iron ores, low grade iron ores such as high Al2O3 containing iron ore will be forced to use soon. But it is hard to use high Al2O3 containing ore for BF process because it deteriorates cold strength and RDI of sinter. Also, high Al2O3 in ore increases slag volume and viscosity if we stick to the conventional slag composition. Thus, to effectively use high Al2O3 contained ore, a new concept to decrease slag volume and decrease of viscosity is required. To meet this demand, the application of ultra high basicity slag (CaO-Al2O3 based slag) is investigated in the present study. The in-situ observation of the separation behavior between a high basicity slag, iron and graphite assembly in a small scale experiments by using a confocal laser scanning microscope(CLSM) as well as the relatively large size of pellet with high basicity slag were carried out. The clear slag/metal separation was observed at the temperature around 1350oC. Also, it was confirmed by relatively large pellet experiments that small amount of solid fraction is allowed for metal/slag separation. These results strongly suggest that the application of the ultra high basicity slag can be the plausible alternative approach to use high Al2O3 content iron ore in the ironmaking process.
To meet the increase of iron ore price and depletion of high grade iron ores, low grade iron ores such as high Al2O3 containing iron ore will be forced to use soon. But it is hard to use high Al2O3 containing ore for BF process because it deteriorates cold strength and RDI of sinter. Also, high Al2O3 in ore increases slag volume and viscosity if we stick to the conventional slag composition. Thus, to effectively use high Al2O3 contained ore, a new concept to decrease slag volume and decrease of viscosity is required. To meet this demand, the application of ultra high basicity slag (CaO-Al2O3 based slag) is investigated in the present study. The in-situ observation of the separation behavior between a high basicity slag, iron and graphite assembly in a small scale experiments by using a confocal laser scanning microscope(CLSM) as well as the relatively large size of pellet with high basicity slag were carried out. The clear slag/metal separation was observed at the temperature around 1350oC. Also, it was confirmed by relatively large pellet experiments that small amount of solid fraction is allowed for metal/slag separation. These results strongly suggest that the application of the ultra high basicity slag can be the plausible alternative approach to use high Al2O3 content iron ore in the ironmaking process.
Keywords
High Al2O3 iron ore; Metal/slag separation; Wetting; Direct reduction.
High Al2O3 iron ore; Metal/slag separation; Wetting; Direct reduction.
How to refer
Park, Ji-Ook;
Sasaki., Yasushi.
HIGH Al2O3 IRON ORE REDUCTION BY EFFECTIVE USE OF
HIGH BASICITY SLAG
,
p. 541-547.
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-22130
