上底吹き転炉におけるクロム鉱石の溶融還元速度に及ぼす諸要因の影響の定量化

概要

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Smelting reduction rate of Cr-ore in top-and-bottom blowing converter was quantitatively estimated by 600 kg scale fundamental experiment and 100 t scale industrial furnace (LD-OB). The change of Cr oxide in slag with time showed zero-order reaction kinetics and the following points were clarified on the reduction rate. 1) The rate was in propotion to ε^<0.5> and L^<1.0>, where ε was stirring energy, L was diameter of furnace. 2) The activation energy was about 210 kJ/mol. 3) The rate were not cleary affected by the kind of Cr-sources, namely, pellets, briquettes of powder ore, carbon containing briquettes and lump ore. 4) The rate increased with the increase in amount of carbon for reduction and the decrease of [%Cr]. According to these results, it was posturated that the transfer of Cr oxide in molten slag phase to the carbon-slag and the metal-slag interfaces was the rate controlling step. The reduction rate was formulated as a function of ε, L, [%Cr], temperature and the containing ratio of carbon for reduction in slag. The results of calculation showed fairly good agreement with the observed values.
社団法人日本鉄鋼協会の論文
1988-04-01