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In the blast furnace of a steel mill the iron ores are reduced to metallic iron. The off-gas from this process contains carbon monoxide (20–28%), carbon dioxide (17–25%) and hydrogen (1–5%). The resulting calorific value of the blast furnace gas is in the range of 2.7 MJ/m3 (STP) to 4.0 MJ/m3 (STP).1) Therefore, the blast furnace gas is used as a fuel in hot blast stoves, boilers and other burners. For the trouble-free burner operation a low dust concentration in the blast furnace gas is required. The temperature of the top gas leaving the blast furnace is usually between 100°C and 200°C and the dew point is in the range from 35°C to 50°C. In some cases the gas temperature is beyond these limits, e.g. during start-up of the blast furnace or when irregularities in the charging occure Temperature peaks up to 600°C are possible. In many plants the blast furnace gas is expanded in the top gas recovery turbine (TRT). In this case a dust concentration of less than 5 mg/m3 (STP) is required.2) Since the dust concentration of the blast furnace gas is usually in the range of 10 g/m3 (STP) to 40 g/m3 (STP), efficient removal of dust from the blast furnace top gas is required.3) The state of the art in the purification of blast furnace gas is described e.g. in the European Commission document “Best Available Emissions and Removal of Gaseous Pollutants from the Top-gas of a Blast Furnace