Physical Modeling of Metallic Droplet Breakage and Coalescence in Molten Slag
Compositional modifiers are injected into molten BOF(Basic Oxygen Furnace)slag with N2/O2 as carrier gas to adjust slag composition during hot stage process.The injection and mixing can cause iron losses due to the splitting of the liquid iron phase into fine iron droplets.In order to clearly understand the droplet behaviour during the hot stage process,a physical modeling was established using the similarity principle and the modeling experiments including single factor experiments and orthogonal experiments were performed in a transparent model with a size ratio of 1 : 4 at room temperature.Paraffin oil and 20 wt.%copper sulfate solution were used to simulate slag and metallic droplets,respectively.The droplets injected into the system during the experiment were captured by a high speed camera and were analyzed by Image Pro Plus software to obtain the droplet size distribution.The physical modelling observation shows that breakage and coalescence of the droplets occur at different test conditions.This is not the case in the current industrial hot-stage slag treatment practice,where the droplet breakage phenomenon is dominant over its coalescence.Droplet breakage was enhanced with increasing gas flow rate and/or lance depth.No significant effect of nozzle configuration was found due to its limited influence on size distribution.The droplet size distribution varies with position of the injection lance.The results from orthogonal experiments show that gas flow rate and lance depth are the most important factors for droplets breakage,and the extent of droplet breakage can be reduced through proper selection of the operational conditions.
metallic droplet behavior metal recovery physical modeling droplet size distribution
WANG Yannan BLANPAIN Bart VANIERSCHOT Maarten GUO Muxing
Department of Materials Engineering,KU Leuven,Leuven 3000,Belgium Mechanical Engineering Technology TC,Campus Group T,KU Leuven,Leuven 3000,Belgium
国际会议
STEELSIM2017(第七届冶金过程及钢铁材料模拟及仿真国际会议)
青岛
英文
90-94
2017-08-16（万方平台首次上网日期，不代表论文的发表时间）