CaF_2-CaCl_2, CaCl_2 を含む石灰系フラックスによる 4%C 溶融鉄の脱りん(脱りん・脱硫 : 石灰系スラグ)(<特集>溶銑処理の発展)

概要

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Iron melt of 4% C was treated with CaO based flux containing CaF_2-CaCl_2 and CaCl_2 additives by using a rotating crucible containing 1 kg metal at 1350℃, and the dephosphorization reaction and its important donimant factors were studied. The transport of phosphorous occurred between slag and metal. The experimental results were explained by assuming the following equation of dephosphorization reaction : [P]+3/2 (O^<2->)+5/4 O_2=(PO_4^<3->) Apparent distribution ratio, L_P(≡(P)/[P]), was strongly dependent on oxygen partial pressure, P_O_2, slag basicity, B, and additive contents. L_P in air was given experimentally as follows : B⩽1.2 logL_P=2.04+8.69 logB+〓N_<Add>. B>1.2 logL_P=2.75+〓N_<Add>. where B=N_<CaO>/(2N_<sio>_2+3N_P_2O_5) N_<Add> : mole fraction of additive N_<Add>=0.15∿0.5 〓^<Ca(F, Cl)>_2=0.74, and 〓^<CaCl>_2=2.91 L_P and overall reaction rate constant of phosphorous, k_p, increased as P_O_2 increased.
社団法人日本鉄鋼協会の論文
1983-11-01