固体鉄飽和Fe-O-S系融体とCaO-SiO_2-FeO_X系スラグの相平衡  [in Japanese] Equilibria between Fe-O-S and CaO-SiO_2-FeO_X Slag Saturated with Solid Iron  [in Japanese]

The phase relation between the CaO-SiO2-FeOX slag and the Fe-O-S melt saturated with solid iron has been investigated at 1573 and 1473K by a quench-chemical analysis method. The oxygen potentials of the melts were also measured by an EMF method. The miscibility gap between oxide and sulfide was illustrated as a function of oxygen potential. The solubility of sulfur in the CaO-SiO2-FeOX slag determined from the phase relations increased with the increase of basicity of the slag. The interaction between sulfur and oxygen in the CaO-SiO2-FeOX system has been discussed, and the following equation is derived as log P02 = log P°02 - 0.096 (mass%S) + 0.0052 (mass%S)2(0.8<%S<10) at 1573K, where P02 , P°02 and (mass%S) are the oxygen partial pressure, the oxygen pressure for the CaO-SiO2-FeOX system and mass% of S in the slag, respectively.