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

Show simple item record Gates, Sarel J. Kornelius, Gerrit Rencken, Steven C. Fagan, Neil M. Cowx, Peter Els, Luther 2016-03-09T10:24:52Z 2016-03-09T10:24:52Z 2015-11
dc.description.abstract During the casting of ferromanganese alloys from electric arc furnaces into sand beds at temperatures of up to 1800°C a considerable amount of very brown fumes are generated when the alloy fume is oxidized in the atmosphere. The fume is difficult to capture because of 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 found that the use of fine water sprays along the edge of the roof that covers the casting bed resulted in a significant reduction in visible emissions. This paper describes research into the kinetics of the fume to improve the design of the capture hoods, as well as the mechanism 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 in increasing the energy content of the taphole plume. The capture of fume particles by fine spray droplets is shown to have limited efficiency, while the heat sink that is caused by evaporation does not materially contribute to the circulation of fume through the spray. It is postulated that the increased moisture content of the air over the casting beds may be instrumental in reducing the oxygen partial 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. en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.uri en_ZA
dc.identifier.citation Gates, SJ, Kornelius, G, Rencken, SC, Fagan, NM, Cowx, P & Els, L 2015, 'The use of fine water sprays to suppress fume emissions when casting ferromanganese', Clean Air Journal, vol. 25, no.2, pp, 26-35. en_ZA
dc.identifier.issn 2410-972X
dc.identifier.other 10.17159/2410-972X/2015/v25n2a3
dc.language.iso en en_ZA
dc.publisher National Association for Clean Air en_ZA
dc.rights This article is licensed under a Creative Commons Attribution 4.0 International License. en_ZA
dc.subject Ferromanganese en_ZA
dc.subject Secondary fume en_ZA
dc.subject Water sprays en_ZA
dc.subject Fume capture hoods en_ZA
dc.subject Fume extraction en_ZA
dc.subject Ferro-alloy tapping en_ZA
dc.title The use of fine water sprays to suppress fume emissions when casting ferromanganese en_ZA
dc.type Article en_ZA

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