SO2 absorption in the sinter bed during the sintering process

Abstract

In order to analyse the influence of sinter bed on the SO2, the sulphur distribution in the sintering process is studied, which indicates that the sulphur enrichment mainly at the preheating layer and drying layer during sintering process. At the wet layer, the sulphur content only is a slightly higher than the sinter mixture where the SO2 dissolve in the moisture. On the basis of thermodynamic analysis, the SO2 absorption is analysed during the sintering process, although the sintering reaction proceed at non-equilibrium condition. The major reaction that affects the residual sulphur is CaO+SO2+1/2O2=CaSO4, and the equilibrium temperature increases with the increased concentration of SO2 and O2, which could increases the sulphur residual in sinter. With the layer temperature increases, the products variation of the SO2 absorption reactions is CaSO3+CaS+CaSO4→aS+CaSO4→aSO4 during sintering process.