THEORETICAL INVESTIGATION ON BY-ONLY-CURRENT ELECTROMAGNETIC SEPARATION OF INCLUSION FROM MOLTEN METALS

摘要

The electromagnetic field under applied AC and DC current in round and rectangular pipe was systematically investigated, then a concept of "equivalent current density" was proposed for evaluating the inhomogeneous electromagnetic pinch force, and the mono-component removal efficiency and the overall removal efficiency of inclusion were formulated. It is founded that flat pipe is superior to round pipe for the electromagnetic removal of inclusion, and DC current con get a higher removal efficiency than AC current due to absence of skin phenomenon. Under usual condition, a removal efficiency of 52 percent for 10 mu m inclusion or more than 92 percent for 20 mu m inclusion can be achieved by imposing a current density of 3 X 10~6 A/m~2 in a flat pipe.