论文部分内容阅读
Metal emulsion produced by passage of gas bubble though interface has potential to increase the surface areabetween molten slag and steel.Chemical reaction efficiencywould be greatly improved by the formation of metal droplets which can disperse in slag phase for some times andthen fall back to metal phase.Some cold systems consisted of immiscible phases have been applied to simulate the emulsion behavior.It was found that the physical properties of system would affect the droplets formation profoundly.Previously,the emulsion in Sn alloy/chloride system was observed by high speed camera by our group.Depending on the gas flow rate,several different formation mechanisms were proposed.In addition formationand sedimentation rate were estimated.In order to get more understanding the Sn alloy/oxide system was employed in this work due to more similar physical properties with actual steel/slag.The oxide with metal droplets in the slag phase during bottom bubbling was sampled.Metal droplets can be separated from the oxide by dissolution into water.After analyzing the number and diameter by microscope,the surface area and mass of droplets were summarized and compared with that in Sn alloy/chloride system.It was found that more large droplets were produced and existed in the upper phase in oxide than that in chloride.Formation rate in oxide was also higher.This can be attributed to the high viscosity of oxide.The effect of gas bubble size will be studied in future.