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In integrated steel mills the ironmaking process usually involves two main process units, the sinter plant and the blast furnace (BF). The BF provides the hot metal (HM) or pig iron by reducing the iron ore into metallic iron. In the sinter plant fine iron ores are agglomerated together with fluxes and iron-rich in-plant return fines as charge material for the BF. Figure 1 shows the schematic flow diagram of the ironmaking process. The off-gas (top-gas) discharged from the BF is de-dusted in two stages before it can be used as fuel. In the first dedusting stage the coarse dust is separated by a dust-catcher or a cyclone. The second de-dusting stage usually comprises of a venturi scrubber or an annular gap scrubber. In recent years an increasing number of dry second-stage de-dusting systems have been installed at BFs.1,2) A considerable amount of residues results from BF top-gas de-dusting: 3.4–18 kg dust per ton of HM from the first de-dusting stage and 2.0–22.3 kg sludge per ton HM from the second de-dusting stage have been reported for European BFs.3) The reported Zn content is 0.1–0.5% Zn and 1.0–10% Zn for the first stage and second stage residue respectively. Most of the dust from first stage de-dusting is recycled to the sinter feed,3–5) while the sludge from second-stage wet de-dusting is mainly discharged to landfill sites because of the higher Potential of Air Classification for Zinc Management in Dust Recycling in Ironmaking