ESR 法による還元鉄ペレットの溶解と精錬効果

概要

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A melting process of directly reduced iron pellets using an ESR apparatus was developed to produce sound steel ingots directly from the pellets. Oxygen and carbon contents in the ingot produced were as low as those after refining in a LD converter, when such deoxidizer as CaC_2, SiC or ferrosilicon was used. An area ratio of nonmetallic inclusions in the ingot was lowered to about 0.05 by the continuous addition of SiC or ferrosilicon. Regarding melting behavior of the pellets, a theoretical analysis and temperature measurements showed that the pellet temperature rapidly rises near the slag pool surface and reaches the melting temperature near the end of steel pipe which is used as an electrode. The melting rate of a pellet in the slag pool increased with decreasing feeding rate of the electrode. Furthermore, oxygen decrease in a pellet during the melting in the slag pool and the deoxidation in the metal pool were discussed on the basis of the overall mass balance in the process.
社団法人日本鉄鋼協会の論文
1984-06-01