Separation of Particles from Molten Aluminum with High Frequency Electromagnetic Field
The current study is to investigate the separation of non-metallic inclusions from molten aluminum with 53-63 kHz high frequency electromagnetic filed.In the experiments,a Al-SiC composite material–pure aluminum with a certain amount of dispersed SiC particles with 10-20 μm diameter – was used.Both laboratory experiments and numerical simulation were performed.It was observed that SiC particles were pushed to the boundary layer of the aluminum close to the wall of the crucible,and the thickness of the particle layer was approximately 1.0-1.5 mm and the area fraction of the particle layer was 9-15%of the entire horizontal cross section area.With separation time going on,the accumulation layer became thinner,and the accumulation layer density became higher.The numerical simulation indicated that the magnetic flux density is larger at top and bottom than other locations and very small at the center of the crucible,and the EM force mainly acted on the outside 0.004 m layer of the melt due to the effect of the skin effect.There were recirculation eddies at the top and bottom and close to the corner where the EM force was the largest.The speed of the flow was 11-13 mm/s at the corner of the top and bottom and was as small as 1 mm/s at the center of the crucible.Both the numerical simulation and the experimental observation showed that the top free surface was not flat,approximately 1.0 mm high at the center of the top surface by numerical simulation and 4.0 mm by the experimental observation.More particles were entrapped at the lower part of the crucible.
Aluminum Simulation High Frequency Electromagnetic Separation
LIU Ting-yao ZHANG Li-feng YANG Shu-feng CHEN Yong-feng LI Yan-long
School of Metallurgical and Ecological Engineering University of Science and Technology Beijing,100083,Beijing,China
国际会议
The 7th International Conference on Electromagnetic Processing of Materials(第七届冶金与材料电磁过程国际大会)
北京
英文
1-9
2012-10-22（万方平台首次上网日期，不代表论文的发表时间）