溶銑, 溶融スラグの酸素ポテンシャルと反応の親和力による高炉内反応の解析(高炉内反応の基礎とモデル)(<特集>製銑)

概要

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Chemical affinities of the transfer reactions of Si, Mn, S, and Fe between slag and pig iron in the blast furnace (A_<SiO_2>, A_<MnO>, A_S and A_<FeO>) were calculated from oxygen potential (P_<O_2>) and temperature of slag and pig iron and their compositions. The P_<O_2> and temperatures were measured by using oxygen concentration cells for slag and pig iron during tapping from the furnace. The following results were obtained ; 1) P_<O_2> in pig iron was larger than that in equilibrium with C and CO gas and thus, oxygen in pig iron was supersaturated. 2) P_<O_2> in slag was one order of magnitude larger than that in pig iron. This P_<O_2> was equal to that in equilibrium with pig iron and FeO in slag. 3) Because A_<SiO_2><0 and A_S<0, SiO_2 in slag could not be reduced and pig iron could not be desulfurized by slag. Because A_<MnO>≃0, <Mn>___- and MnO in slag would be in equilibrium. 4) The magnitude of A_<SiO_2> depended on the characteristics of each of the three blast furnaces examined. 5) The content of FeO in slag could be estimated from P_<O_2> and temperature in slag by using oxygen concentration cells for slag.
社団法人日本鉄鋼協会の論文
1982-11-01