酸素濃淡電池による Q-BOP 転炉内の溶滓, 溶鋼, 気相の酸素ポテンシャルと温度の直接測定

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The oxygen potential (represented by p_<O_2>) and temperature in liquid iron, slag and gas phases in a Q-BOP converter during blowing were measured by using different types of oxygen concentration cell with ZrO_2-base solid electrolyte for each phase. p_<O_2> and temperature in liquid iron continuously increased from 1×10^<-14>atm at 1400℃ at the initial stage of oxygen blowing to 1×10^<-10>atm at 1600℃ at the end of blowing. p_<O_2> in slag at the end of blowing was about 10^<-9>atm, being close to p_<O_2> in equilibrium with Fe^<2+> and Fe^<3+> and closely rinked with the ratio of wt%Fe^<3+> to the sum of wt%Fe^<3+> and wt%Fe^<2+>. Because slags were solid at the initial and middle stages of blowing, p_<O_2> in slag was estimated 10^<-4> to 10^<-6>atm from the value of the above-mentioned ratio. p_<O_2> in gas phase was 3×10^<-13>atm at the initial stage and it remained lower than that in liquid iron after the middle stage. On the basis of experimental findings, the reaction mechanism of the elements in steel with slag was discussed and the characteristic of Q-BOP as a reaction vessel was compared with that of LD converter.
1982-02-01