炭酸ナトリウム-硫酸ナトリウム系フラックスによる炭素飽和溶鉄の同時脱りん脱硫

概要

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The effect of the temperature, silicon and manganese in carbon-saturated iron (0.1% P, 0.05% S) on the dephosphorization and the desulfurization was studied by the use of the 2Na_2CO_3-Na_2SO_4 flux. The degree of the dephosphorization and the desulfurization considerably decreased and the evaporation of sodium increased with increasing temperature. As a result of the flux consumption for the oxidation of silicon, their degree was found to remarkably decrease, but manganese in metal was found to gradually decrease. The reversion of phosphorus and sulfur was observed after the end of the flux addition, but the extent of their reversion decreased when silica was present in the flux. The behavior of the dephosphorization and the desulfurization obtained by the 2Na_2CO_3・Na_2SO_4 flux was compared with those by the Na_2CO_3 flux and the 2Na_2CO_3・Fe_2O_3 flux. The degree of the dephosphorization was almost same, but the remarkable evaporation of phosphorus was observed according to the acceleration of CO formation by the reduction of iron oxide with carbon in metal. This evaporation was also observed in the 2Na_2CO_3・Na_2SO_4 flux, but its extent decreased with increasing the P_2O_5 and the SiO_2 concentration in slag.
社団法人日本鉄鋼協会の論文
1979-11-01