抄録
The oxygen potential (represented by Po2) 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 ZrO2-base solid electrolyte for each phase. Po2 and temperature in liquid iron continuously increased from 1 × 10-14 atm at 1 400°C at the initial stage of oxygen blowing to 1 × 10-10 atm at 1 600 °C at the end of blowing. Po2 in slag at the end of blowing was about 10-9 atm, being close to Po2 in equilibrium with Fe2+ and Fe3+ and closely rinked with the ratio of wt%Fe3+ to the sum of wt%Fe3+ and wt%Fe2+. Because slags were solid at the initial and middle stages of blowing, Po2 in slag was estimated 10-4 to 10-6 atm from the value of the above-mentioned ratio.Po2 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.
