鉄浴式溶融還元におけるスラグ層の状況と酸化鉄還元反応の機構

概要

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It was reported that the reduction rate constant of iron ore increased with increasing of the amount of slag in the smelting reduction with a thick slag layer. However, its mechanism was not clear. In this study, distributions of metal droplets and carbonaceous materials in the slag layer were investigated with a 100t converter and the mechanism of reduction of iron ore was discussed. The obtained results were as follows : (1) Considered from the distributions above, 44% of iron oxide was reduced at the metal surface in the lower 30% of the slag layer, 6% of theat was reduced at the metal surface in the upper 70% of the slag layer and 50% of that was reduced at the surface of the carbonaceous materials in the slag. (2) For achieving high productivity keeping high post-combustion ratio, low dust formation and a stable operation without slag foaming, the following methods are useful. (i) keeping a large amount of slag. (ii) keeping a large amount of carbonaceous materials in the slag. (iii) controlling the bottom stirring to surpress the amount of metal droplets in the upper 70% of slag layer.
社団法人日本鉄鋼協会の論文
1996-09-01