ステンレス溶鋼の還元脱りん及びスラグの処理方法

概要

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The dephosphorization of molten stainless steel by the addition of metallic Ca has been studied by using a laboratory scale high frequency furnace and industrial scale electric arc furnace. In addition, safety treatments of dephosphorization slag were examined. The results obtained are summarized as follows : (1) In a laboratory scale test, the relation between activities of C and O (α_C and α_O) of molten steels and dephosphorization ratios were found. Optimum conditions where dephosphorization ratios reached more than 50% were α_C<0.92 and α_O<4×10^<-4> at 1480℃. (2) In order to obtain the optimum condition of 18Cr8Ni steel, it was necessary to control carbon and oxygen contents in the range of 0.3%<C<1.0% and O<60ppm at 1480℃, respectively. (3) In the industrial scale experiment on 13Cr5Ni steel, dephosphorization ratio and desulfurization ratio were 33% and 55%, respectively, by the addition of Ca=10.6kg per ton steel. (4) Concentrations of PH_3 and H_2S generating from dephosphorization slag were measured. Maximum concentrations were 160ppm/g for PH_3 and 400ppm/g for H_2S before safety treatment. After the safety treatment by using oxide slag, maximum concentrations decreased to 2ppm/g for PH_3 and 11ppm/g for H_2S.
社団法人日本鉄鋼協会の論文
1984-12-01