Modeling of manganese ferroalloy slag properties and flow during tapping

Show simple item record Muller, Jacques Zietsman, Johannes Hendrik Pistorius, Petrus Christiaan 2015-08-21T10:12:45Z 2015-08-21T10:12:45Z 2015-12
dc.description.abstract Stable operation of submerged-arc furnaces producing high-carbon ferromanganese (HCFeMn) and silicomanganese (SiMn) requires tapping of consistent amounts of liquid slag and metal. Minimal effort to initiate and sustain tapping at reasonable rates is desired, accommodating fluctuations in especially slag chemical composition and temperature. An analytical model is presented that estimates the tapping rate of the liquid slag-metal mixture as a function of taphole dimensions, coke bed particulate properties, and slag and metal physicochemical properties with dependencies on chemical composition and temperature. This model may be used to evaluate the sensitivity to fluctuations in these parameters, and to determine the influence of converting between HCFeMn and SiMn production. The model was applied to typical HCFeMn and SiMn process conditions, using modelled slag viscosities and densities. Tapping flow rates estimated were comparable to operational data and found to be dependent mostly on slag viscosity. Slag viscosities were generally lower for typical SiMn slags due to the higher temperature used for calculating viscosity. It was predicted that flow through the taphole would mostly develop into laminar flow, with the pressure drop predominantly over the coke bed. Flow rates were found to be more dependent on the taphole diameter than on the taphole length. en_ZA
dc.description.embargo 2016-12-31 en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.uri en_ZA
dc.identifier.citation Muller, J, Zietsman, JH & Pistorius, PC 2015, 'Modeling of manganese ferroalloy slag properties and flow during tapping', Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, vol. 46, no. 6, pp. 2639-2651. en_ZA
dc.identifier.issn 1073-5615 (print)
dc.identifier.issn 1543-1916 (online)
dc.identifier.other 10.1007/s11663-015-0426-7
dc.language.iso en en_ZA
dc.publisher Springer en_ZA
dc.rights © The Minerals, Metals & Materials Society and ASM International 2015. The original publication is available at : en_ZA
dc.subject Taphole en_ZA
dc.subject High-carbon ferromanganese en_ZA
dc.subject Silicomanganese en_ZA
dc.subject Physicochemical properties en_ZA
dc.title Modeling of manganese ferroalloy slag properties and flow during tapping en_ZA
dc.type Postprint Article en_ZA

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