Partitions of Nitrogen and Sulfur between CaO-Al₂O₃ Melts and Liquid Iron

抄録

Nitrogen and sulfur distribution ratios between CaO-Al₂O₃ slags and Fe-0.0001-33mass%Al alloys were measured in the temperature range of 1823 to 1923 K, using an Al₂O₃ and CaO crucibles. The distribution ratios under a CaO crucible were higher than those under an Al₂O₃ crucible, and increased with an increase of Al content. Nitride and sulfide capacities defined by C_N^3-=(mass%N)·P_O2^3/4/P_N2^1/2 and C_S^2-=(mass%S)·P_O2^1/2/P_S2^1/2, respectively, which were obtained by using the reported values for activity of Al₂O₃, agreed well with those directly measured in a gas-slag experiment under an Al₂O₃ crucible, but disagreed with those under a CaO crucible. Activities of Al₂O₃ in the CaO-Al₂O₃ melts saturated with CaO were evaluated based on the results in the gas-slag experiments.