Theoretical analysis of velocity and removal efficiency of non-metallic inclusions in molten steel by electromagnetic filtration

The principle of the electromagnetic filtration is that under the action of EMF (electromagnetic force) the non-metallic inclusions with low electrical conductivity move in the direction opposite to that of the EMF. By hydromechanics analysis, the moving velocity of non-metallic inclusions and the removal efficiency from horizontal flowing molten steel by electromagnetic filtration have been studied using piston model and trajectory model. The removal efficiency of the non-metallic inclusion (eta) increases with the reduction of the melt velocity (u), the height of the filter (2h), the increment of EMF, operating distance of electromagnetic force (x) and inclusion size (d(P)). It has been confirmed that the non-metallic inclusion less than 10 mum can be removed efficiently. Theoretical analysis can be used to direct the design of filter structure and confirmation of technological parameters. This new technique is high efficient as compared with general filtration methods, which offers a possibility for production of high clean molten steel.