Abstract
Effects of processing variables using such as the frequency of imposed field ( f), imposed magnetic flux density ( B e), processing time ( t), the diameter of inclusions ( d p) and the ratio of pipe radius to skin depth ( r 1/ δ) on the electromagnetic separation (EMS) removal efficiency of inclusions from an aluminum melt were analyzed theoretically. It was found that the removal efficiency ( η) reaches a maximum while r 1/ δ ranges from 1.5 to 2. In addition, wider effective range of r 1/ δ will be obtained with larger d p or higher f. Experimental results on aluminum melt show that higher frequency and magnetic flux density make for higher removal efficiency, matching well with the theoretical results. In the case of f=15.6 kHz, B e=0.1 T and t=10 s, more than 80% inclusion particles with 6-μm diameter can be removed.
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