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Synopsis : To improve sinter productivity and quality, the effect of secondary admixing coke breeze and limestone in the drum mixer on the permeability and the reduction characteristics were investigated by the sintering pot and tablet tests. The following results were obtained. ( 1 ) The secondary admixing technique to coke breeze enhanced permeability at moisture zone with increasing the quasi-particle size and strength, and the secondary admixing technique to limestone enhanced permeability at melting zone by the improvement of melt fluidity. ( 2 ) The sinter reducibility was improved by secondary admixing limestone and coke breeze, because of increasing micro pore originated from relict ore. ( 3 ) The above improvements were decreased with extending the coating time, because of destruction of quasi-particles due to intrusion of secondary admixing material inside the granules.

Influence of Limestone and Coke Breeze Distribution in the Quasi-particle on Permeability during Sintering and Sinter Quality