ELIMINATION-REACTION OF NO GAS GENERATED FROM COKE COMBUSTION IN IRON-ORE SINTER BED

Since equipment, built to eliminate the NOx gas in the off gas of iron ore sinter plant, is huge and expensive, it is desirable that a more simple and economical method to eliminate the NO gas is established. T he method to eliminate the NO gas near the coke in the iron ore sinter bed has been studied. As a basic study on NO elimination reaction, th e reaction characteristics between NO gas and the heated iron oxide at each oxidation grade or calcia-iron oxide compound under the atmosphe re with or without CO/CO2 have been investigated. It became clear that the iron oxide with lower oxidation grade accelerates to decrease the NO gas concentration in the off gas and that the co-existence CO gas also decreases it with the effect of lowering the oxidation grade of i ron oxide.