1990 Volume 76 Issue 9 Pages 1488-1495
Oxygen potential at slag-metal interface, PO2*, is determined from the experimental results of the authors' previous study on phosphorus reaction kinetics between high carbon concentration iron melt and iron oxide containing slag. The PO2* value is calculated on the assumption that quasi-equilibrium is attained when transition in the phosphorus reaction occurs from dephosphorization to rephosphorization.
The oxygen potential at the slag-metal interface, PO2, is obtained as 10-16 10-15 atm. PO2* increases with increasing Fe3+/(Fe2+ + Fe3+ ) in the slag phase or the partial pressure of oxygen in the atmospheric gas, while PO2* decreases with the increase in the rotating speed of mechanical stirrer. The oxygen potential in the slag bulk, PO2, is calculated on the basis of regular solution model, and is found to be 2 or 3 orders of magnitude greater than PO2* at the slag-metal interface. Comparison is made between the PO2* values determined from the data of the experimental study and those obtained from mathematical model calculation which simulates the simultaneous reactions of phosphorus and carbon. Fairly good agreement between the two is obtained.