Proper MgO addition in blast furnace operation

Abstract

Based on laboratory experiment, the effects of MgO on sintering process and metallurgical properties of sintered ore are examined. The experiment results show that, adding no or small amount of MgO in sintering, the sintering productivity can be improved, and the sintered ore can have high cold strength and small temperature range of cohesive zone and as a result the permeability of cohesive zone can be improved and the total pressure drop of blast furnace (BF) can be decreased. In this paper a new process of proper MgO addition into BF operation is proposed and in this process MgO content in BF slag can meet the requirement and at the same time RDI of sintered ore is low. © 2006 ISIJ.