Since equipment, built to eliminate the NOx gas in the off gas of iron are sinter plant, is huge inci expensive, it is desirable that a more simple and economical method to eliminate the NO gas is established.
The method to eliminate the NO gas near the coke in the iron are sinter bed has been studied. As a basic study on NO elimination reaction, the reaction characteristics between NO gas and the heated iron oxide at each oxidation grade or calcia-iron oxide compound under the atmosphere 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 iron oxide.
