水素-アルゴン・プラズマによる溶融酸化鉄の還元および脱りん

概要

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Iron oxide (Whyalla ore) of 300∿700g charged in a water-cooled iron vessel was melted down by argon plasma, and then reduced by plasma of 10∿50% H_2-Ar mixtures. The flow rate of mixture was 10 l/min and the electric power was 15kW. The result showed that the reduction degree of iron oxide was determined as a linear function of the ratio of hydrogen amount used to the weight of iron oxide charged. The utilization efficiency of hydrogen for the reduction reaction was found to be 50∿70%, which was higher than the equilibrium values for H_2-H_2O-Fe-Fe_xO system below 3000°K. Such a high efficiency would result from strong reactivity of hydrogen atom which was formed by the thermal dissociation of hydrogen molecule in the plasma. Phosphorus behaviour during the reduction of molten iron oxide containing P_2O_5, CaO, SiO_2, and Al_2O_3 was examined. The calculation of material balance for phosphorus indicated that phosphorus was transferred out of the reactor. The amount of phosphorus transfer was found to increase exponentially with respect to the reaction time. The transferred amount decreased with increasing value of CaO/(SiO_2+Al_2O_3) ratio.
社団法人日本鉄鋼協会の論文
1980-12-01