The use of fine water sprays to suppress fume emissions when casting ferromanganese

摘要

During the casting of ferromanganese alloys from electric arc furnaces into sand beds at temperatures of up to 1800°C a considerableamount of very brown fumes are generated when the alloy fume is oxidized in the atmosphere. The fume is difficult to capture becauseof the large flux of gas that is generated. Possible reasons for this flux include the high evaporation rate of Mn at elevated temperatures,the large surface area of the casting beds and the large thermal plumes over the furnace tapholes and casting beds. It has been foundthat the use of fine water sprays along the edge of the roof that covers the casting bed resulted in a significant reduction in visibleemissions. This paper describes research into the kinetics of the fume to improve the design of the capture hoods, as well as themechanism of suppression by the water sprays by using CFD analysis. It is shown that the oxidation reaction produces less than 20%of the energy content of the plume over the arc furnace taphole, and also that radiation heat transfer may play an important role inincreasing the energy content of the taphole plume. The capture of fume particles by fine spray droplets is shown to have limitedefficiency, while the heat sink that is caused by evaporation does not materially contribute to the circulation of fume through thespray. It is postulated that the increased moisture content of the air over the casting beds may be instrumental in reducing the oxygenpartial pressure or in the formation of an oxide layer, both of which would reduce metal evaporation and, therefore fume formation.The exact mechanism requires further investigation.