Effects of the magnetic field exerted on the plate type feeder on the voidfraction in the sintering bed and sinter productivity

To improve the sintering productivity and yield, the effects of the magneti c force produced by magnets equipped under the plate feeder on the structur e of the sintering bed and sintering performance were investigated by the l aboratory charging experiments and sintering tests. Introducing the magnetic force on the sinter mixture during charging, void fraction in the sintering bed was increased with the reduction of falling v elocity caused by the increase of the friction of particles against the pla te. Moreover return fine and mill scale, which improved the melt fluidity, were segregated toward the upper layer by changing those trajectory. As the se results, the sintering productivity and the sinter yield were increased. From the above findings, a new type feeder was developed and applied to Miz ushima No. 3 sinter plant, confirming the principle of the method.