INTERFACIAL-TENSIONS BETWEEN MUTUAL INTER FACES OF LIQUID-IRON, SIO2-AL2O3-MNO-MNS SLAGS AND MNS BASED SULFIDE

Interfacial tensions between liquid MnO-SiO2-Al2O3(sat)slag/liquid iro n of varying sulfur content, MnS based sulfide/liquid iron, and MnO-Si O2-Al2O3(sat) slag/MnS based sulfide were studied at 1550 degrees C us ing Sessile Drop Method. The interfacial tensions, sigma, between liqu id Mno-SiO2-Al2O3 slag/liquid iron were found to be 0.164 to 1.10 N/m, depending on sulfur and oxygen contents in liquid iron and they were expressed by the following equation as a function of sulfur and oxygen activities: 1.07-sigma = 0.235 In(1 + 10a(s) + 120a(s)) Precipitation of MnS based sulfide under the condition of adding more than 20mass% MnS to the slag was observed to occur at the slag-metal interface. The interfacial tensions between MnS based sulfide/liquid iron as well as MnO-SiO2-Al2O3(sat) slag/MnS based sulfide were found to be 0.114 and 0.077 N/m, respectively.