ISSN 2594-357X
34º Seminário de Redução de Minério de Ferro e Matérias-Primas — Vol. 01 , num. 34 (2004)
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Abstract
In order to develop the effective way of nitrogen removal from molten steel in the electric arc furnace steelmaking, an attempt was made to accelerate the reaction by the simultaneous decarburization. The iron ore powder was blasted on to the molten steel surface with Ar under ambient pressure. By the blasting of iron ore, the decarburization occurs resulting in the acceleration of nitrogen removal several times than the mere Ar blasting. Under the hard blasting condition, the nitrogen content decreased from 70 to 28 ppm for 1,000 s, while the carbon content decreased from 0.55 to 0.12 wt%. When the carbon content is larger than 0.09 wt%, the decarburization was controlled by the oxygen transfer and CO bubbles are formed in the melt. When it is less than 0.09 wt%, however, the decarburization was controlled by the carbon transfer and the reaction occurs only on the melt surface. It is concluded that the effective nitrogen removal is possible even under atmospheric pressure, in the range where the decarburization reaction is controlled by the oxygen transfer. The effective interfacial area is 7 times at most as much as the cross sectional area of furnace.
In order to develop the effective way of nitrogen removal from molten steel in the electric arc furnace steelmaking, an attempt was made to accelerate the reaction by the simultaneous decarburization. The iron ore powder was blasted on to the molten steel surface with Ar under ambient pressure. By the blasting of iron ore, the decarburization occurs resulting in the acceleration of nitrogen removal several times than the mere Ar blasting. Under the hard blasting condition, the nitrogen content decreased from 70 to 28 ppm for 1,000 s, while the carbon content decreased from 0.55 to 0.12 wt%. When the carbon content is larger than 0.09 wt%, the decarburization was controlled by the oxygen transfer and CO bubbles are formed in the melt. When it is less than 0.09 wt%, however, the decarburization was controlled by the carbon transfer and the reaction occurs only on the melt surface. It is concluded that the effective nitrogen removal is possible even under atmospheric pressure, in the range where the decarburization reaction is controlled by the oxygen transfer. The effective interfacial area is 7 times at most as much as the cross sectional area of furnace.
Keywords
acceleration of nitrogen removal, decarburization by iron ore powder blasting, reaction mechanism, molten steel, electric arc furnace
acceleration of nitrogen removal, decarburization by iron ore powder blasting, reaction mechanism, molten steel, electric arc furnace
How to cite
Kawakami, M.; Inoue, M.; Kim, JS.; Takenaka, T.; Yokoyama, S..
Simultaneous Decarburization and Nitrogen Removal by Blasting Iron Ore Powder on to Molten Steel Surface,
p. 675-684.
In: 34º Seminário de Redução de Minério de Ferro e Matérias-Primas,
None,
2004.
ISSN: 2594-357X, DOI 10.5151/2594-357x-34Red-675-684
