Effect of Insertion of Burning Down Materials on Sinter Cake Property and Permeability

Abstract

To increase the utilization of the high combined water ores in sinter production, the improvement of gas permeability of the sintering bed is required.It was attempted for permeability improvement that the burning down materials; paper briquette (PB) would be inserted into the lower half of sintering bed up to 5 vol% at pot test. The permeability of the bed was almost equal to that of normal bed during sintering of the upper bed, but at the lower half of the bed permeability increased in proportion of PB insertion volume.The reason of permeability improvement is that the flow resistance at combustion zone decreases with formation of macro void caused by PB combustion just before ignition of the coke breeze.The ratio of large particle in the product sinter reduced as increase of PB insertion. It is considered that thin parts of sinter; "bridge" between macro voids formed by PB insertion, and these bridges break preferentially during sizing process. Therefore, the large sinter particle could decrease as PB insertion increases.