Investigation of the impact of oxygen potential on sulfur mass transfer at Slag/Iron interface
In this work, sulfur dynamic mass transfer at the slag/iron interface was investigated by using X-ray sessile drop method in dynamic mode. The experiments were carried out with pure iron and CaO-SiO2-Al2O3-FeO slag (alumina saturated at the experimental temperature) contained in alumina crucibles at a temperature of 1873 K under non-equilibrium conditions. The gas atmosphere was a mixture of CO, SO2 and Ar with well-controlled partial pressures of oxygen and sulfur. During the sulfur mass transfer, the impact of oxygen potential on iron droplet oscillation was monitored. The change in interfacial tension results in the change of iron droplet shape. The circularity of droplet, which describes the droplet shape, was calculated as a function of time to determine the droplet oscillations. The impact of oxygen potential was investigated by determining the amplitude of droplet oscillations and the interfacial velocity of the sulfur transfer. Experimental results indicate that the amplitude of oscillations and interfacial velocity increase as the oxygen potential increases. The order of magnitude for the interfacial velocity was found to be 10-3 m/s. The experimental results were also explained by previous ab initio calculations. The thermo-physical and thermo-chemical properties of slag were also found to influence interfacial velocity. As the slag basicity increases, the activity of FeO increases, the sulfur capacity increases, and the viscosity of the slag decreases. These changes make sulfur move faster along the interface, resulting in a higher interfacial velocity.
Mass transfer Slag/iron interface oxygen potential interfacial velocity
Weimin Cao Luckman Muhmood Seshadri Seetharaman
Division of Materials Process Science, Department of Materials Science and Engineering, Royal Instit CSIRO, Process Science & Engineering, Melbourne, Australia
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-10
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）