Abstract
Patterns of trace elements participating in PM2.5 (aerosol dynamic diameter ≤2.5 μm) formation during iron ore sintering process were investigated. For elucidating this property, PM2.5 collected from before and after the flue-gas-temperature-rising point (stage-1 and stage-2) was examined. The results show that trace elements including Pb, K, Na, Cl and S presented an enriched tendency in PM2.5 from stage-2, while characterised lower contents in PM2.5 from stage-1. Owing to the tiny size of PM2.5, trace elements participated in the formation of Fe-rich and Fe–Al–Si-rich particles in heterogeneous manner. Moreover, S participated in the formation of CaSO4 particles from stage-1 and stage-2 in the form of homogeneous pattern, while Pb, K, Na and Cl participated homogeneously in the form of hybrid PbCl2–KCl, KCl and NaCl particles only from stage-2. The finding results clearly showed the relationship between the formation mechanisms of PM2.5 and the contribution of trace elements, which can serve as the guideline to control PM2.5 in sintering plants.
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