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→CaS+CaSO₄→CaSO₄ during sintering process.