Deoxidization Equilibria with Zirconium and Sulfur Partition for Molten Iron/CaO-Al_2O_3-ZrO_2 Slag at 1873K

摘要

The relationship of zirconium and oxygen concentrations with sulfide capacity was clarified using equilibrated molten iron with CaO-Al_2O_3-ZrO_2 slag at 1873 K. Al_2O_3 and CaO-stabilized ZrO_2 crucible saturated compositions were equilibrated with CaO centre dot 2Al_2O_3 and crucible solid solution (Css) in the CaO-ZrO_2 system, and with CaO centre dot ZrO_2 and Css, respectively. From the concentrations of zirconium and oxygen dissolved in molten iron, ZrO_2 activities of the slag of the Al_2O_3 crucible and ZrO_2 crucible compositions were determined to be 0.885 and 0.0343, respectively. On the other hand, the sulfur distribution ratio of the ZrO_2 crucible saturated composition was higher than that of the Al_2O_3 crucible saturated composition. Sulfide capacities were determined to be 6.30 X 10~(-5) and 8.07 X 10~(-5) in the Al_2O_3 and the ZrO_2 crucible saturated compositions, respectively.