粉状クロム鉱石の利用によるパイロットプラント規模での溶融還元実験(マンガン, クロム, 鉄の溶融還元とスクラップ溶解)(<特集>転炉機能の拡大)

概要

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Experiments of smelting reduction of chromium ore by using 5 t test converter have been made to produce chromium containing hot metal for stainless steelmaking. Special interest was focused on usage of fine chromite to the smelting process. Laboratory scale experiments have been also made with 20 kg induction furnace to clarify the mechanism of smelting behavior of fine ore. Following results were obtained : (1) When raw chromite was injected with oxygen gas from a bottom tuyere, chromium recovery ratio of 70∿93% was obtained. This high recovery ratio was caused by heating and smelting of chromite sand in the high temperature region near the tuyeres. This phenomena was simulated by dipping a sintered chromite into Fe-Cr-C melt in the induction furnace with supplying oxygen. (2) Addition of chromite sand through a top blown "oxy-coal burner" was also tried and the same high recovery ratio was obtained. Thermal cracking of chromite sand by the oxy-coal burner was confirmed by experiments of model burner. (3) Unsteady heat conduction analysis shows that the chromite sand can be heated up to almost the same temperature of environment during very short time (<0.01 s). (4) Ratio of transitory reaction rate of ascending chromite sand with Fe-C melt was studied.
社団法人日本鉄鋼協会の論文
1990-11-01