炭酸ソーダによる溶銑精錬時のりん・硫黄・マンガン分配比

抄録

Reactions of Na₂CO₃ with phosphorous, sulphur and manganese in hot metal contained in an alumina crucible were studied in the temperature range between 1 250 and 1 450°C. Hot metal was oxidized with oxygen in top blowing.
The results showed that simultaneous removal of phosphorous and sulphur from hot metal took place. The distribution ratios of phosphorous and sulphur between hot metal and slag were found to increase lineally with the basicity index of slag, (Na₂O)/1.03(SiO₂) +1.31(P₂O₅), while the distribution ratio of manganese decreased with increase of the basicity index. This decreasing tendency for manganese could be due to higher value of the activity coefficient of manganese oxide in relative higher basicity slag.
The temperature dependency of distribution ratios was examined. Both distribution ratios of phosphorous and sulphur decreased with increase of reaction temperature.